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How to make { and } automatically have left and right

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2

Desired behavior

{ and } should turn into left{ and right{.

Attempt 1

edef{{left{}

edef}{right}}

Error message

TeX capacity exceeded, sorry [input stack size=5000].



font@name ->

             OT1/cmr/m/n/10 

l.16 edef{{left{

                    }

If you really absolutely need more capacity,

you can ask a wizard to enlarge me.

Attempt 2

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Result

Error message

Missing delimiter (. inserted).



<to be read again> 

                   {

l.7 ${

       }$

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.



! Missing delimiter (. inserted).

<to be read again> 

                   }

l.7 ${}

         $

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.

Attempt 3

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Output

Related, working solutions

Doing this for langle and rangle works just fine:

edeflangle{leftlangle}

edefrangle{rightrangle}

Even doing this for ( and ) is a bit more complicated, but works:

begingroup

    catcode`(active

    xdef({leftstring(}

    catcode`)active

    xdef){rightstring)}

endgroup

mathcode`(="8000

mathcode`)="8000

macros brackets

share|improve this question

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Of course this can be done, but it's not really a good idea. See Is it ever bad to use left and right?.
  
  – barbara beeton
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You could use DeclarePairedDelimiter from mathtools to define braced{{x_i}^2}.
  
  – Davislor
  5 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Davislor True. It's still messier than just {x_i^2}, IMO.
  
  – Solomon Ucko
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @SolomonUcko I would strongly advise against redefining standard TeX syntax to mean something different. First, it makes the code impossible to read because the syntax means something different from what anyone reading it thinks it does. Second, any code you copy-and-paste to a new document or a new template will silently break. Third, you disable the ability to control the sizing of your braces if you want to.
  
  – Davislor
  3 hours ago
  

  
  
  
  

add a comment | 

2

Desired behavior

{ and } should turn into left{ and right{.

Attempt 1

edef{{left{}

edef}{right}}

Error message

TeX capacity exceeded, sorry [input stack size=5000].



font@name ->

             OT1/cmr/m/n/10 

l.16 edef{{left{

                    }

If you really absolutely need more capacity,

you can ask a wizard to enlarge me.

Attempt 2

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Result

Error message

Missing delimiter (. inserted).



<to be read again> 

                   {

l.7 ${

       }$

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.



! Missing delimiter (. inserted).

<to be read again> 

                   }

l.7 ${}

         $

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.

Attempt 3

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Output

Related, working solutions

Doing this for langle and rangle works just fine:

edeflangle{leftlangle}

edefrangle{rightrangle}

Even doing this for ( and ) is a bit more complicated, but works:

begingroup

    catcode`(active

    xdef({leftstring(}

    catcode`)active

    xdef){rightstring)}

endgroup

mathcode`(="8000

mathcode`)="8000

macros brackets

share|improve this question

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Of course this can be done, but it's not really a good idea. See Is it ever bad to use left and right?.
  
  – barbara beeton
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You could use DeclarePairedDelimiter from mathtools to define braced{{x_i}^2}.
  
  – Davislor
  5 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Davislor True. It's still messier than just {x_i^2}, IMO.
  
  – Solomon Ucko
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @SolomonUcko I would strongly advise against redefining standard TeX syntax to mean something different. First, it makes the code impossible to read because the syntax means something different from what anyone reading it thinks it does. Second, any code you copy-and-paste to a new document or a new template will silently break. Third, you disable the ability to control the sizing of your braces if you want to.
  
  – Davislor
  3 hours ago
  

  
  
  
  

add a comment | 

Desired behavior

{ and } should turn into left{ and right{.

Attempt 1

edef{{left{}

edef}{right}}

Error message

TeX capacity exceeded, sorry [input stack size=5000].



font@name ->

             OT1/cmr/m/n/10 

l.16 edef{{left{

                    }

If you really absolutely need more capacity,

you can ask a wizard to enlarge me.

Attempt 2

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Result

Error message

Missing delimiter (. inserted).



<to be read again> 

                   {

l.7 ${

       }$

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.



! Missing delimiter (. inserted).

<to be read again> 

                   }

l.7 ${}

         $

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.

Attempt 3

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Output

Related, working solutions

Doing this for langle and rangle works just fine:

edeflangle{leftlangle}

edefrangle{rightrangle}

Even doing this for ( and ) is a bit more complicated, but works:

begingroup

    catcode`(active

    xdef({leftstring(}

    catcode`)active

    xdef){rightstring)}

endgroup

mathcode`(="8000

mathcode`)="8000

macros brackets

share|improve this question

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

edef{{left{}

edef}{right}}

TeX capacity exceeded, sorry [input stack size=5000].



font@name ->

             OT1/cmr/m/n/10 

l.16 edef{{left{

                    }

If you really absolutely need more capacity,

you can ask a wizard to enlarge me.

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

Missing delimiter (. inserted).



<to be read again> 

                   {

l.7 ${

       }$

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.



! Missing delimiter (. inserted).

<to be read again> 

                   }

l.7 ${}

         $

I was expecting to see something like `(' or `{' or

`}' here. If you typed, e.g., `{' instead of `{', you

should probably delete the `{' by typing `1' now, so that

braces don't get unbalanced. Otherwise just proceed.

Acceptable delimiters are characters whose delcode is

nonnegative, or you can use `delimiter <delimiter code>'.

documentclass{standalone}



edef{{leftstring{}

edef}{rightstring}}



begin{document}

${}$

end{document}

edeflangle{leftlangle}

edefrangle{rightrangle}

begingroup

    catcode`(active

    xdef({leftstring(}

    catcode`)active

    xdef){rightstring)}

endgroup

mathcode`(="8000

mathcode`)="8000

share|improve this question

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

share|improve this question

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

asked 8 hours ago

Solomon UckoSolomon Ucko

125111

1 Answer
1

active

oldest

votes

4

The usual trick is to let the old command to an "orig" version and use it in the definition of a changed command:

letleftbraceOrig={

letrightbraceOrig=}

def{{leftleftbraceOrig}

def}{rightrightbraceOrig}

Result:

begin{equation}

{int_{-infty}^infty frac{e^{-x^2}}{2} dx }

end{equation}

share|improve this answer

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

answered 8 hours ago

BorisBoris

30.9k265107

add a comment | 

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4

The usual trick is to let the old command to an "orig" version and use it in the definition of a changed command:

letleftbraceOrig={

letrightbraceOrig=}

def{{leftleftbraceOrig}

def}{rightrightbraceOrig}

Result:

begin{equation}

{int_{-infty}^infty frac{e^{-x^2}}{2} dx }

end{equation}

share|improve this answer

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

answered 8 hours ago

BorisBoris

30.9k265107

add a comment | 

4

The usual trick is to let the old command to an "orig" version and use it in the definition of a changed command:

letleftbraceOrig={

letrightbraceOrig=}

def{{leftleftbraceOrig}

def}{rightrightbraceOrig}

Result:

begin{equation}

{int_{-infty}^infty frac{e^{-x^2}}{2} dx }

end{equation}

share|improve this answer

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

answered 8 hours ago

BorisBoris

30.9k265107

add a comment | 

The usual trick is to let the old command to an "orig" version and use it in the definition of a changed command:

letleftbraceOrig={

letrightbraceOrig=}

def{{leftleftbraceOrig}

def}{rightrightbraceOrig}

Result:

begin{equation}

{int_{-infty}^infty frac{e^{-x^2}}{2} dx }

end{equation}

share|improve this answer

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

answered 8 hours ago

BorisBoris

30.9k265107

letleftbraceOrig={

letrightbraceOrig=}

def{{leftleftbraceOrig}

def}{rightrightbraceOrig}

begin{equation}

{int_{-infty}^infty frac{e^{-x^2}}{2} dx }

end{equation}

share|improve this answer

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

answered 8 hours ago

BorisBoris

30.9k265107

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

edited 8 hours ago

Artificial Odorless Armpit

5,84911345

answered 8 hours ago

BorisBoris

30.9k265107

answered 8 hours ago

BorisBoris

30.9k265107