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NMaximize is not converging to a solution
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?Declaration of variables in large Linear Programming model with NMaximizeHow trustworthy is NMaximize?Numeric range: present or notMaximalBy[#, “votes”] & not equal to MaximalBy[“votes”]?Maximimize not working properly?Does fitting data get stuck by non-homogeneous interval of data?How to find maximum (not with numbers,but with parameters) of 2-variables function under constraints?Hot to single out numeric values from NMaximizeNSum: Summand (or its derivative) is not numerical at pointProblem with constraints of NMaximize
$begingroup$
I am trying to use NMaximize to find the maximum value of a variable that satisfies the given constraints. Since the constraints aren't straightforward, I am using the function.
I can see the constraints are such that the value is bounded but I get the below warning messages:
NMaximize::cvmit: Failed to converge to the requested accuracy or
precision within 100000 iterations.
NMaximize::cvdiv: Failed to
converge to a solution. The function may be unbounded.
The constraint and the way I am using the function is as below:
constraint = (x | y) [Element]
Integers && ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x -
3.63201*10^84 x^2]) || (10713. <= x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2]))
maxX =
NMaximize[x, constraint, x, y, MaxIterations -> 100000]
I have increased the MaxIterations from 100 to 100000 but it doesn't seem to converge. I am not sure if increasing the MaxIterations is the solution. Can you please guide me with this?
functions maximum
asked Apr 5 at 17:27
gagansogaganso
1528
$endgroup$
|
show 1 more comment
$begingroup$
I am trying to use NMaximize to find the maximum value of a variable that satisfies the given constraints. Since the constraints aren't straightforward, I am using the function.
I can see the constraints are such that the value is bounded but I get the below warning messages:
NMaximize::cvmit: Failed to converge to the requested accuracy or
precision within 100000 iterations.
NMaximize::cvdiv: Failed to
converge to a solution. The function may be unbounded.
The constraint and the way I am using the function is as below:
constraint = (x | y) [Element]
Integers && ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x -
3.63201*10^84 x^2]) || (10713. <= x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2]))
maxX =
NMaximize[x, constraint, x, y, MaxIterations -> 100000]
I have increased the MaxIterations from 100 to 100000 but it doesn't seem to converge. I am not sure if increasing the MaxIterations is the solution. Can you please guide me with this?
functions maximum
asked Apr 5 at 17:27
gagansogaganso
1528
$endgroup$
$begingroup$
Could try maximizing over individual regions of the piecewise set-up. But the machine precision values will make validation of inequalities kind of iffy.
$endgroup$
– Daniel Lichtblau
Apr 5 at 17:44
1
$begingroup$
I'm not seeing what $y$ has to do with this. Wouldn't the maximum value of $x$ be 19762?constraint /. x -> 19762results iny [Element] Integers && 7229.16 < y < 7344.29andconstraint /. x -> 19763results inFalse.
$endgroup$
– JimB
Apr 5 at 17:51
$begingroup$
@JimB, I think forx,yisn't needed. Thanks for pointing this out. But if I am trying to maximizey, I need to maximize over both the variables sinceyis an expression ofx, right?
$endgroup$
– gaganso
Apr 5 at 18:06
$begingroup$
Yes, if that's what you want. The general solution appears to be $x = 19762$ and $7230leq y leq 7344$. So to maximize $y$ you'd choose $7344$.
$endgroup$
– JimB
Apr 5 at 18:49
1
$begingroup$
OK. I was assuming that you were conditioning on the maximum value of $x$.
$endgroup$
– JimB
Apr 5 at 18:57
|
show 1 more comment
$begingroup$
I am trying to use NMaximize to find the maximum value of a variable that satisfies the given constraints. Since the constraints aren't straightforward, I am using the function.
I can see the constraints are such that the value is bounded but I get the below warning messages:
NMaximize::cvmit: Failed to converge to the requested accuracy or
precision within 100000 iterations.
NMaximize::cvdiv: Failed to
converge to a solution. The function may be unbounded.
The constraint and the way I am using the function is as below:
constraint = (x | y) [Element]
Integers && ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x -
3.63201*10^84 x^2]) || (10713. <= x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2]))
maxX =
NMaximize[x, constraint, x, y, MaxIterations -> 100000]
I have increased the MaxIterations from 100 to 100000 but it doesn't seem to converge. I am not sure if increasing the MaxIterations is the solution. Can you please guide me with this?
functions maximum
asked Apr 5 at 17:27
gagansogaganso
1528
$endgroup$
I am trying to use NMaximize to find the maximum value of a variable that satisfies the given constraints. Since the constraints aren't straightforward, I am using the function.
I can see the constraints are such that the value is bounded but I get the below warning messages:
NMaximize::cvmit: Failed to converge to the requested accuracy or
precision within 100000 iterations.
NMaximize::cvdiv: Failed to
converge to a solution. The function may be unbounded.
The constraint and the way I am using the function is as below:
constraint = (x | y) [Element]
Integers && ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x -
3.63201*10^84 x^2]) || (10713. <= x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-43 Sqrt[
4.98614*10^92 + 4.65469*10^88 x - 3.63201*10^84 x^2]))
maxX =
NMaximize[x, constraint, x, y, MaxIterations -> 100000]
I have increased the MaxIterations from 100 to 100000 but it doesn't seem to converge. I am not sure if increasing the MaxIterations is the solution. Can you please guide me with this?
functions maximum
functions maximum
asked Apr 5 at 17:27
gagansogaganso
1528
asked Apr 5 at 17:27
gagansogaganso
1528
asked Apr 5 at 17:27
gagansogaganso
1528
asked Apr 5 at 17:27
gagansogaganso
1528
asked Apr 5 at 17:27
gagansogaganso
1528
1528
$begingroup$
Could try maximizing over individual regions of the piecewise set-up. But the machine precision values will make validation of inequalities kind of iffy.
$endgroup$
– Daniel Lichtblau
Apr 5 at 17:44
1
$begingroup$
I'm not seeing what $y$ has to do with this. Wouldn't the maximum value of $x$ be 19762?constraint /. x -> 19762results iny [Element] Integers && 7229.16 < y < 7344.29andconstraint /. x -> 19763results inFalse.
$endgroup$
– JimB
Apr 5 at 17:51
$begingroup$
@JimB, I think forx,yisn't needed. Thanks for pointing this out. But if I am trying to maximizey, I need to maximize over both the variables sinceyis an expression ofx, right?
$endgroup$
– gaganso
Apr 5 at 18:06
$begingroup$
Yes, if that's what you want. The general solution appears to be $x = 19762$ and $7230leq y leq 7344$. So to maximize $y$ you'd choose $7344$.
$endgroup$
– JimB
Apr 5 at 18:49
1
$begingroup$
OK. I was assuming that you were conditioning on the maximum value of $x$.
$endgroup$
– JimB
Apr 5 at 18:57
|
show 1 more comment
$begingroup$
Could try maximizing over individual regions of the piecewise set-up. But the machine precision values will make validation of inequalities kind of iffy.
$endgroup$
– Daniel Lichtblau
Apr 5 at 17:44
1
$begingroup$
I'm not seeing what $y$ has to do with this. Wouldn't the maximum value of $x$ be 19762?constraint /. x -> 19762results iny [Element] Integers && 7229.16 < y < 7344.29andconstraint /. x -> 19763results inFalse.
$endgroup$
– JimB
Apr 5 at 17:51
$begingroup$
@JimB, I think forx,yisn't needed. Thanks for pointing this out. But if I am trying to maximizey, I need to maximize over both the variables sinceyis an expression ofx, right?
$endgroup$
– gaganso
Apr 5 at 18:06
$begingroup$
Yes, if that's what you want. The general solution appears to be $x = 19762$ and $7230leq y leq 7344$. So to maximize $y$ you'd choose $7344$.
$endgroup$
– JimB
Apr 5 at 18:49
1
$begingroup$
OK. I was assuming that you were conditioning on the maximum value of $x$.
$endgroup$
– JimB
Apr 5 at 18:57
$begingroup$
Could try maximizing over individual regions of the piecewise set-up. But the machine precision values will make validation of inequalities kind of iffy.
$endgroup$
– Daniel Lichtblau
Apr 5 at 17:44
$begingroup$
Could try maximizing over individual regions of the piecewise set-up. But the machine precision values will make validation of inequalities kind of iffy.
$endgroup$
– Daniel Lichtblau
Apr 5 at 17:44
1
1
$begingroup$
I'm not seeing what $y$ has to do with this. Wouldn't the maximum value of $x$ be 19762?
constraint /. x -> 19762 results in y [Element] Integers && 7229.16 < y < 7344.29 and constraint /. x -> 19763 results in False.$endgroup$
– JimB
Apr 5 at 17:51
$begingroup$
I'm not seeing what $y$ has to do with this. Wouldn't the maximum value of $x$ be 19762?
constraint /. x -> 19762 results in y [Element] Integers && 7229.16 < y < 7344.29 and constraint /. x -> 19763 results in False.$endgroup$
– JimB
Apr 5 at 17:51
$begingroup$
@JimB, I think for
x, y isn't needed. Thanks for pointing this out. But if I am trying to maximize y, I need to maximize over both the variables since y is an expression of x, right?$endgroup$
– gaganso
Apr 5 at 18:06
$begingroup$
@JimB, I think for
x, y isn't needed. Thanks for pointing this out. But if I am trying to maximize y, I need to maximize over both the variables since y is an expression of x, right?$endgroup$
– gaganso
Apr 5 at 18:06
$begingroup$
Yes, if that's what you want. The general solution appears to be $x = 19762$ and $7230leq y leq 7344$. So to maximize $y$ you'd choose $7344$.
$endgroup$
– JimB
Apr 5 at 18:49
$begingroup$
Yes, if that's what you want. The general solution appears to be $x = 19762$ and $7230leq y leq 7344$. So to maximize $y$ you'd choose $7344$.
$endgroup$
– JimB
Apr 5 at 18:49
1
1
$begingroup$
OK. I was assuming that you were conditioning on the maximum value of $x$.
$endgroup$
– JimB
Apr 5 at 18:57
$begingroup$
OK. I was assuming that you were conditioning on the maximum value of $x$.
$endgroup$
– JimB
Apr 5 at 18:57
|
show 1 more comment
2 Answers
2
active
oldest
votes
$begingroup$
Rationalize the constraint:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y < 2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <= x <=
19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) //
Rationalize[#, 0] & // Simplify;
With the Rationalized constraint you can use Maximize:
maxX = Maximize[x, constraint2, x, y]
(* 19762, x -> 19762, y -> 7287 *)
constraint2 /. maxX[[2]]
(* True *)
EDIT: To find maximum y
(maxY = Maximize[y, constraint2, x, y]) // N
To plot the region defined by the constraint:
reg = ImplicitRegion[constraint2, x, y];
Region[reg,
Frame -> True,
FrameLabel -> (Style[#, 12, Bold] & /@ x, y),
Epilog -> Red,
AbsolutePointSize[3],
Point[x, y /. maxX[[2]]],
Point[x, y /. maxY[[2]]]]
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
$endgroup$
add a comment |
$begingroup$
You have numbers spread a wide range of magnitudes for no good reason. This range is probably too wide for machine precision arithmetic. Also telling NMinimize explicitly that this an integer optimization problem seems to help. Try this:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <=
x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) // Expand
maxX = NMaximize[x, constraint2, x, y, Integers,
MaxIterations -> 10000]
19762., x -> 19762, y -> 7311
And with your definition of constraint:
constraint /. maxX[[2]]
True
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
$endgroup$
$begingroup$
Butconstraint /. x -> 19762 /. y -> 8647results inFalse?
$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@HenrikSchumacher, thank you for this. This works forxbut when I try to find the maximumysimilarly, I still get the same message -NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.
$endgroup$
– gaganso
Apr 5 at 18:12
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Rationalize the constraint:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y < 2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <= x <=
19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) //
Rationalize[#, 0] & // Simplify;
With the Rationalized constraint you can use Maximize:
maxX = Maximize[x, constraint2, x, y]
(* 19762, x -> 19762, y -> 7287 *)
constraint2 /. maxX[[2]]
(* True *)
EDIT: To find maximum y
(maxY = Maximize[y, constraint2, x, y]) // N
To plot the region defined by the constraint:
reg = ImplicitRegion[constraint2, x, y];
Region[reg,
Frame -> True,
FrameLabel -> (Style[#, 12, Bold] & /@ x, y),
Epilog -> Red,
AbsolutePointSize[3],
Point[x, y /. maxX[[2]]],
Point[x, y /. maxY[[2]]]]
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
$endgroup$
add a comment |
$begingroup$
Rationalize the constraint:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y < 2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <= x <=
19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) //
Rationalize[#, 0] & // Simplify;
With the Rationalized constraint you can use Maximize:
maxX = Maximize[x, constraint2, x, y]
(* 19762, x -> 19762, y -> 7287 *)
constraint2 /. maxX[[2]]
(* True *)
EDIT: To find maximum y
(maxY = Maximize[y, constraint2, x, y]) // N
To plot the region defined by the constraint:
reg = ImplicitRegion[constraint2, x, y];
Region[reg,
Frame -> True,
FrameLabel -> (Style[#, 12, Bold] & /@ x, y),
Epilog -> Red,
AbsolutePointSize[3],
Point[x, y /. maxX[[2]]],
Point[x, y /. maxY[[2]]]]
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
$endgroup$
add a comment |
$begingroup$
Rationalize the constraint:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y < 2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <= x <=
19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) //
Rationalize[#, 0] & // Simplify;
With the Rationalized constraint you can use Maximize:
maxX = Maximize[x, constraint2, x, y]
(* 19762, x -> 19762, y -> 7287 *)
constraint2 /. maxX[[2]]
(* True *)
EDIT: To find maximum y
(maxY = Maximize[y, constraint2, x, y]) // N
To plot the region defined by the constraint:
reg = ImplicitRegion[constraint2, x, y];
Region[reg,
Frame -> True,
FrameLabel -> (Style[#, 12, Bold] & /@ x, y),
Epilog -> Red,
AbsolutePointSize[3],
Point[x, y /. maxX[[2]]],
Point[x, y /. maxY[[2]]]]
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
$endgroup$
Rationalize the constraint:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y < 2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <= x <=
19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) //
Rationalize[#, 0] & // Simplify;
With the Rationalized constraint you can use Maximize:
maxX = Maximize[x, constraint2, x, y]
(* 19762, x -> 19762, y -> 7287 *)
constraint2 /. maxX[[2]]
(* True *)
EDIT: To find maximum y
(maxY = Maximize[y, constraint2, x, y]) // N
To plot the region defined by the constraint:
reg = ImplicitRegion[constraint2, x, y];
Region[reg,
Frame -> True,
FrameLabel -> (Style[#, 12, Bold] & /@ x, y),
Epilog -> Red,
AbsolutePointSize[3],
Point[x, y /. maxX[[2]]],
Point[x, y /. maxY[[2]]]]
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
edited Apr 5 at 19:18
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
answered Apr 5 at 18:54
Bob HanlonBob Hanlon
61.9k33598
61.9k33598
add a comment |
add a comment |
$begingroup$
You have numbers spread a wide range of magnitudes for no good reason. This range is probably too wide for machine precision arithmetic. Also telling NMinimize explicitly that this an integer optimization problem seems to help. Try this:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <=
x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) // Expand
maxX = NMaximize[x, constraint2, x, y, Integers,
MaxIterations -> 10000]
19762., x -> 19762, y -> 7311
And with your definition of constraint:
constraint /. maxX[[2]]
True
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
$endgroup$
$begingroup$
Butconstraint /. x -> 19762 /. y -> 8647results inFalse?
$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@HenrikSchumacher, thank you for this. This works forxbut when I try to find the maximumysimilarly, I still get the same message -NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.
$endgroup$
– gaganso
Apr 5 at 18:12
add a comment |
$begingroup$
You have numbers spread a wide range of magnitudes for no good reason. This range is probably too wide for machine precision arithmetic. Also telling NMinimize explicitly that this an integer optimization problem seems to help. Try this:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <=
x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) // Expand
maxX = NMaximize[x, constraint2, x, y, Integers,
MaxIterations -> 10000]
19762., x -> 19762, y -> 7311
And with your definition of constraint:
constraint /. maxX[[2]]
True
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
$endgroup$
$begingroup$
Butconstraint /. x -> 19762 /. y -> 8647results inFalse?
$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@HenrikSchumacher, thank you for this. This works forxbut when I try to find the maximumysimilarly, I still get the same message -NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.
$endgroup$
– gaganso
Apr 5 at 18:12
add a comment |
$begingroup$
You have numbers spread a wide range of magnitudes for no good reason. This range is probably too wide for machine precision arithmetic. Also telling NMinimize explicitly that this an integer optimization problem seems to help. Try this:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <=
x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) // Expand
maxX = NMaximize[x, constraint2, x, y, Integers,
MaxIterations -> 10000]
19762., x -> 19762, y -> 7311
And with your definition of constraint:
constraint /. maxX[[2]]
True
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
$endgroup$
You have numbers spread a wide range of magnitudes for no good reason. This range is probably too wide for machine precision arithmetic. Also telling NMinimize explicitly that this an integer optimization problem seems to help. Try this:
constraint2 = ((x == 0 && 1. <= y <= 12720.) || (1. <= x <= 10712. &&
0 <= y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2]) || (10713. <=
x <= 19762. &&
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) -
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2] < y <
2.08565*10^-36 (3.04959*10^39 + 2.24751*10^34 x) +
2.8484*10^-1 Sqrt[
4.98614*10^8 + 4.65469*10^4 x - 3.63201 x^2])) // Expand
maxX = NMaximize[x, constraint2, x, y, Integers,
MaxIterations -> 10000]
19762., x -> 19762, y -> 7311
And with your definition of constraint:
constraint /. maxX[[2]]
True
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
edited Apr 5 at 18:02
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
answered Apr 5 at 17:53
Henrik SchumacherHenrik Schumacher
61.1k585171
61.1k585171
$begingroup$
Butconstraint /. x -> 19762 /. y -> 8647results inFalse?
$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@HenrikSchumacher, thank you for this. This works forxbut when I try to find the maximumysimilarly, I still get the same message -NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.
$endgroup$
– gaganso
Apr 5 at 18:12
add a comment |
$begingroup$
Butconstraint /. x -> 19762 /. y -> 8647results inFalse?
$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@HenrikSchumacher, thank you for this. This works forxbut when I try to find the maximumysimilarly, I still get the same message -NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.
$endgroup$
– gaganso
Apr 5 at 18:12
$begingroup$
But
constraint /. x -> 19762 /. y -> 8647 results in False?$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
But
constraint /. x -> 19762 /. y -> 8647 results in False?$endgroup$
– JimB
Apr 5 at 17:57
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@JimB D'oh. Yeah, I did the simplification wrong. -.- Thanks for pointing that out.
$endgroup$
– Henrik Schumacher
Apr 5 at 18:02
$begingroup$
@HenrikSchumacher, thank you for this. This works for
x but when I try to find the maximum y similarly, I still get the same message - NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.$endgroup$
– gaganso
Apr 5 at 18:12
$begingroup$
@HenrikSchumacher, thank you for this. This works for
x but when I try to find the maximum y similarly, I still get the same message - NMaximize[y, res, x, y, Integers, MaxIterations -> 100000]. Output: NMaximize::cvdiv: Failed to converge to a solution. The function may be unbounded.$endgroup$
– gaganso
Apr 5 at 18:12
add a comment |
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$begingroup$
Could try maximizing over individual regions of the piecewise set-up. But the machine precision values will make validation of inequalities kind of iffy.
$endgroup$
– Daniel Lichtblau
Apr 5 at 17:44
1
$begingroup$
I'm not seeing what $y$ has to do with this. Wouldn't the maximum value of $x$ be 19762?
constraint /. x -> 19762results iny [Element] Integers && 7229.16 < y < 7344.29andconstraint /. x -> 19763results inFalse.$endgroup$
– JimB
Apr 5 at 17:51
$begingroup$
@JimB, I think for
x,yisn't needed. Thanks for pointing this out. But if I am trying to maximizey, I need to maximize over both the variables sinceyis an expression ofx, right?$endgroup$
– gaganso
Apr 5 at 18:06
$begingroup$
Yes, if that's what you want. The general solution appears to be $x = 19762$ and $7230leq y leq 7344$. So to maximize $y$ you'd choose $7344$.
$endgroup$
– JimB
Apr 5 at 18:49
1
$begingroup$
OK. I was assuming that you were conditioning on the maximum value of $x$.
$endgroup$
– JimB
Apr 5 at 18:57