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Simple macro for new # symbol [duplicate]

7

This question already has an answer here:

• 
  Can I redefine a command to contain itself?
  
  4 answers
  
  

I was unsatisfied with how the # symbol looked in my document and had a look at this question. I tried to create a simple macro to replace

#

with

texttt#

I thought that a simple

renewcommand#texttt#

would do the trick. Instead, I'm getting a fatal (!) error.

[25] [26] [27] [28] [29] (c:/texlive/2017/texmf-dist/tex/latex/base/t1cmtt.fd)
! TeX capacity exceeded, sorry [grouping levels=255].
hmode@bgroup ->leavevmode bgroup 


! ==> Fatal error occurred, no output PDF file produced!
Transcript written on Thesis.log.

What is going wrong and why? How can I succesfully create the macro I need?

errors symbols

share|improve this question

asked Apr 3 at 10:18

user3461126user3461126

383

marked as duplicate by JouleV, Raaja, Stefan Pinnow, Phelype Oleinik, Tiuri Apr 3 at 13:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Since LaTeX is a macro expansion language you essentially tell LaTeX to replace every occurrence of # with texttt#. Since the replacement text (texttt#) contains # again you end up with an infinite loop of replacements being attempted. After a while TeX gives up because its capacity is exceeded.
  
  – moewe
  Apr 3 at 10:20
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  In that case a trick like letoldhash# renewcommand#textttoldhash usually helps. The letoldhash# copies the definition of # into oldhash and you can then use oldhash in the replacement of # to get the same effect but without the loop. Another way would be renewcommand#textttchar"23 if you know where the # lives in your font. That said, I'm not quite sure if it is absolutely safe to redefine #, so I would probably choose a new name making it unnecessary to avoid the loop.
  
  – moewe
  Apr 3 at 10:22
  
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  lethashtag#renewcommand#texttthashtag does work. Though, I'd just define hashtag to be texttt# and then use hashtag throughout.
  
  – daleif
  Apr 3 at 10:23
  

  
  
  
  

add a comment | 

7

This question already has an answer here:

• 
  Can I redefine a command to contain itself?
  
  4 answers
  
  

I was unsatisfied with how the # symbol looked in my document and had a look at this question. I tried to create a simple macro to replace

#

with

texttt#

I thought that a simple

renewcommand#texttt#

would do the trick. Instead, I'm getting a fatal (!) error.

[25] [26] [27] [28] [29] (c:/texlive/2017/texmf-dist/tex/latex/base/t1cmtt.fd)
! TeX capacity exceeded, sorry [grouping levels=255].
hmode@bgroup ->leavevmode bgroup 


! ==> Fatal error occurred, no output PDF file produced!
Transcript written on Thesis.log.

What is going wrong and why? How can I succesfully create the macro I need?

errors symbols

share|improve this question

asked Apr 3 at 10:18

user3461126user3461126

383

marked as duplicate by JouleV, Raaja, Stefan Pinnow, Phelype Oleinik, Tiuri Apr 3 at 13:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Since LaTeX is a macro expansion language you essentially tell LaTeX to replace every occurrence of # with texttt#. Since the replacement text (texttt#) contains # again you end up with an infinite loop of replacements being attempted. After a while TeX gives up because its capacity is exceeded.
  
  – moewe
  Apr 3 at 10:20
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  In that case a trick like letoldhash# renewcommand#textttoldhash usually helps. The letoldhash# copies the definition of # into oldhash and you can then use oldhash in the replacement of # to get the same effect but without the loop. Another way would be renewcommand#textttchar"23 if you know where the # lives in your font. That said, I'm not quite sure if it is absolutely safe to redefine #, so I would probably choose a new name making it unnecessary to avoid the loop.
  
  – moewe
  Apr 3 at 10:22
  
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  lethashtag#renewcommand#texttthashtag does work. Though, I'd just define hashtag to be texttt# and then use hashtag throughout.
  
  – daleif
  Apr 3 at 10:23
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Can I redefine a command to contain itself?
  
  4 answers
  
  

I was unsatisfied with how the # symbol looked in my document and had a look at this question. I tried to create a simple macro to replace

#

with

texttt#

I thought that a simple

renewcommand#texttt#

would do the trick. Instead, I'm getting a fatal (!) error.

[25] [26] [27] [28] [29] (c:/texlive/2017/texmf-dist/tex/latex/base/t1cmtt.fd)
! TeX capacity exceeded, sorry [grouping levels=255].
hmode@bgroup ->leavevmode bgroup 


! ==> Fatal error occurred, no output PDF file produced!
Transcript written on Thesis.log.

What is going wrong and why? How can I succesfully create the macro I need?

errors symbols

share|improve this question

asked Apr 3 at 10:18

user3461126user3461126

383

#

texttt#

renewcommand#texttt#

[25] [26] [27] [28] [29] (c:/texlive/2017/texmf-dist/tex/latex/base/t1cmtt.fd)
! TeX capacity exceeded, sorry [grouping levels=255].
hmode@bgroup ->leavevmode bgroup 


! ==> Fatal error occurred, no output PDF file produced!
Transcript written on Thesis.log.

share|improve this question

asked Apr 3 at 10:18

user3461126user3461126

383

share|improve this question

asked Apr 3 at 10:18

user3461126user3461126

383

asked Apr 3 at 10:18

user3461126user3461126

383

asked Apr 3 at 10:18

user3461126user3461126

383

1 Answer
1

active

oldest

votes

12

You cannot define a command in terms of itself like that, because upon finding # TeX will replace it by texttt#, then replacing it by texttttexttt# and so on.

Solution for the particular case

renewcommand#textttsymbol`#

because the standard definition of # is a streamlined form of symbol`#.

For other situations when command just produces text,

letstandardcommand=command
renewcommandcommandtextttstandardcommand

would work.

share|improve this answer

answered Apr 3 at 10:25

egregegreg

735k8919343260

add a comment | 

12

You cannot define a command in terms of itself like that, because upon finding # TeX will replace it by texttt#, then replacing it by texttttexttt# and so on.

Solution for the particular case

renewcommand#textttsymbol`#

because the standard definition of # is a streamlined form of symbol`#.

For other situations when command just produces text,

letstandardcommand=command
renewcommandcommandtextttstandardcommand

would work.

share|improve this answer

answered Apr 3 at 10:25

egregegreg

735k8919343260

add a comment | 

12

You cannot define a command in terms of itself like that, because upon finding # TeX will replace it by texttt#, then replacing it by texttttexttt# and so on.

Solution for the particular case

renewcommand#textttsymbol`#

because the standard definition of # is a streamlined form of symbol`#.

For other situations when command just produces text,

letstandardcommand=command
renewcommandcommandtextttstandardcommand

would work.

share|improve this answer

answered Apr 3 at 10:25

egregegreg

735k8919343260

add a comment | 

You cannot define a command in terms of itself like that, because upon finding # TeX will replace it by texttt#, then replacing it by texttttexttt# and so on.

Solution for the particular case

renewcommand#textttsymbol`#

because the standard definition of # is a streamlined form of symbol`#.

For other situations when command just produces text,

letstandardcommand=command
renewcommandcommandtextttstandardcommand

would work.

share|improve this answer

answered Apr 3 at 10:25

egregegreg

735k8919343260

renewcommand#textttsymbol`#

letstandardcommand=command
renewcommandcommandtextttstandardcommand

share|improve this answer

answered Apr 3 at 10:25

egregegreg

735k8919343260

answered Apr 3 at 10:25

egregegreg

735k8919343260

answered Apr 3 at 10:25

egregegreg

735k8919343260