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How can I separate the number from the unit in argument?

2

Let us say that I have a function, in which I give a number plus a unit. I would like to get only the number, is it possible ?

Here is a MWE:

documentclass{article}

usepackage[utf8]{inputenc}



newcommand{cmd}[1]{#1} % change here to capture only the number.  

begin{document}

    cmd{12pt} % print 12pt while I would get only 12, in a generic case.

end{document}

macros lengths unit-of-measure

share|improve this question

edited 2 hours ago

Bernard

175k776207

asked 2 hours ago

R. NR. N

313214

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  documentclass{article} defcmd#1pt{#1} begin{document} cmd12pt end{document}
  
  – marmot
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @marmot - That'll work for pt as the unit, but for em, mm, km, etc. :-)
  
  – Mico
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Mico Yes, I know. But it does answer the question.
  
  – marmot
  1 hour ago
  

  
  
  
  

add a comment | 

2

Let us say that I have a function, in which I give a number plus a unit. I would like to get only the number, is it possible ?

Here is a MWE:

documentclass{article}

usepackage[utf8]{inputenc}



newcommand{cmd}[1]{#1} % change here to capture only the number.  

begin{document}

    cmd{12pt} % print 12pt while I would get only 12, in a generic case.

end{document}

macros lengths unit-of-measure

share|improve this question

edited 2 hours ago

Bernard

175k776207

asked 2 hours ago

R. NR. N

313214

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  documentclass{article} defcmd#1pt{#1} begin{document} cmd12pt end{document}
  
  – marmot
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @marmot - That'll work for pt as the unit, but for em, mm, km, etc. :-)
  
  – Mico
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Mico Yes, I know. But it does answer the question.
  
  – marmot
  1 hour ago
  

  
  
  
  

add a comment | 

Let us say that I have a function, in which I give a number plus a unit. I would like to get only the number, is it possible ?

Here is a MWE:

documentclass{article}

usepackage[utf8]{inputenc}



newcommand{cmd}[1]{#1} % change here to capture only the number.  

begin{document}

    cmd{12pt} % print 12pt while I would get only 12, in a generic case.

end{document}

macros lengths unit-of-measure

share|improve this question

edited 2 hours ago

Bernard

175k776207

asked 2 hours ago

R. NR. N

313214

documentclass{article}

usepackage[utf8]{inputenc}



newcommand{cmd}[1]{#1} % change here to capture only the number.  

begin{document}

    cmd{12pt} % print 12pt while I would get only 12, in a generic case.

end{document}

share|improve this question

edited 2 hours ago

Bernard

175k776207

asked 2 hours ago

R. NR. N

313214

share|improve this question

edited 2 hours ago

Bernard

175k776207

asked 2 hours ago

R. NR. N

313214

edited 2 hours ago

Bernard

175k776207

edited 2 hours ago

Bernard

175k776207

asked 2 hours ago

R. NR. N

313214

asked 2 hours ago

R. NR. N

313214

3 Answers
3

active

oldest

votes

2

Here's a LuaLaTeX-based solution. It sets up a LaTeX macro called cmd -- a "wrapper" -- that invokes a Lua function that does all of the work. The Lua function expects its argument to consist of two parts: the first part is numeric, i.e., consists of the digits 0 thru 9, plus possibly the characters ,, ., -, and +; the part second is alphabetic, i.e., uppercase and lowercase letters, plus possibly whitespace.

Per your typesetting objective, the function returns just the numeric, part. If the argument of cmd does not start with a numeric component, the prefix part is discarded as well. E.g., the output of arg{XX55km} is 55, and the output of cmd{km} is blank (empty).

% !TEX TS-program = lualatex

documentclass{article}

usepackage{luacode} % for 'luacode' environment

begin{luacode}

function get_num ( s )

  tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )

end

end{luacode}

newcommandcmd[1]{directlua{get_num("#1")}}  % "wrapper" macro



begin{document}

cmd{12pt}, $cmd{-47km}$, cmd{+5.7in}, cmd{3,14159CM}

end{document}

share|improve this answer

edited 1 hour ago

answered 1 hour ago

MicoMico

285k31388778

add a comment | 

2

Assuming the unit consists of two characters, you can do it in an expandable way:

documentclass{article}

usepackage{xparse}



ExplSyntaxOn



NewExpandableDocumentCommand{getnumber}{m}

 {

  tl_range:nnn { #1 } { 1 } { -3 } % from the first to the last but two character

 }



ExplSyntaxOff



begin{document}



getnumber{12pt}, $getnumber{-47km}$, getnumber{+5.7in}, getnumber{3,14159CM}



end{document}

share|improve this answer

answered 1 hour ago

egregegreg

731k8819293244

add a comment | 

1

pgf does that without the need to invoke external programs and converts the units into points.

documentclass{article}

usepackage{pgf}



newcommand{cmd}[1]{pgfmathparse{#1}pgfmathresult} 

begin{document}

    cmd{12pt} cmd{1cm} 

end{document}

Note that if you're bugged by the .0: this can easily be removed with pgfmathprintnumber[<your number format here>]{pgfmathresult} if you choose a number format that you like.

share|improve this answer

answered 1 hour ago

marmotmarmot

113k5145275

add a comment | 

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2

Here's a LuaLaTeX-based solution. It sets up a LaTeX macro called cmd -- a "wrapper" -- that invokes a Lua function that does all of the work. The Lua function expects its argument to consist of two parts: the first part is numeric, i.e., consists of the digits 0 thru 9, plus possibly the characters ,, ., -, and +; the part second is alphabetic, i.e., uppercase and lowercase letters, plus possibly whitespace.

Per your typesetting objective, the function returns just the numeric, part. If the argument of cmd does not start with a numeric component, the prefix part is discarded as well. E.g., the output of arg{XX55km} is 55, and the output of cmd{km} is blank (empty).

% !TEX TS-program = lualatex

documentclass{article}

usepackage{luacode} % for 'luacode' environment

begin{luacode}

function get_num ( s )

  tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )

end

end{luacode}

newcommandcmd[1]{directlua{get_num("#1")}}  % "wrapper" macro



begin{document}

cmd{12pt}, $cmd{-47km}$, cmd{+5.7in}, cmd{3,14159CM}

end{document}

share|improve this answer

edited 1 hour ago

answered 1 hour ago

MicoMico

285k31388778

add a comment | 

2

Here's a LuaLaTeX-based solution. It sets up a LaTeX macro called cmd -- a "wrapper" -- that invokes a Lua function that does all of the work. The Lua function expects its argument to consist of two parts: the first part is numeric, i.e., consists of the digits 0 thru 9, plus possibly the characters ,, ., -, and +; the part second is alphabetic, i.e., uppercase and lowercase letters, plus possibly whitespace.

Per your typesetting objective, the function returns just the numeric, part. If the argument of cmd does not start with a numeric component, the prefix part is discarded as well. E.g., the output of arg{XX55km} is 55, and the output of cmd{km} is blank (empty).

% !TEX TS-program = lualatex

documentclass{article}

usepackage{luacode} % for 'luacode' environment

begin{luacode}

function get_num ( s )

  tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )

end

end{luacode}

newcommandcmd[1]{directlua{get_num("#1")}}  % "wrapper" macro



begin{document}

cmd{12pt}, $cmd{-47km}$, cmd{+5.7in}, cmd{3,14159CM}

end{document}

share|improve this answer

edited 1 hour ago

answered 1 hour ago

MicoMico

285k31388778

add a comment | 

Here's a LuaLaTeX-based solution. It sets up a LaTeX macro called cmd -- a "wrapper" -- that invokes a Lua function that does all of the work. The Lua function expects its argument to consist of two parts: the first part is numeric, i.e., consists of the digits 0 thru 9, plus possibly the characters ,, ., -, and +; the part second is alphabetic, i.e., uppercase and lowercase letters, plus possibly whitespace.

Per your typesetting objective, the function returns just the numeric, part. If the argument of cmd does not start with a numeric component, the prefix part is discarded as well. E.g., the output of arg{XX55km} is 55, and the output of cmd{km} is blank (empty).

% !TEX TS-program = lualatex

documentclass{article}

usepackage{luacode} % for 'luacode' environment

begin{luacode}

function get_num ( s )

  tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )

end

end{luacode}

newcommandcmd[1]{directlua{get_num("#1")}}  % "wrapper" macro



begin{document}

cmd{12pt}, $cmd{-47km}$, cmd{+5.7in}, cmd{3,14159CM}

end{document}

share|improve this answer

edited 1 hour ago

answered 1 hour ago

MicoMico

285k31388778

% !TEX TS-program = lualatex

documentclass{article}

usepackage{luacode} % for 'luacode' environment

begin{luacode}

function get_num ( s )

  tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )

end

end{luacode}

newcommandcmd[1]{directlua{get_num("#1")}}  % "wrapper" macro



begin{document}

cmd{12pt}, $cmd{-47km}$, cmd{+5.7in}, cmd{3,14159CM}

end{document}

share|improve this answer

edited 1 hour ago

answered 1 hour ago

MicoMico

285k31388778

answered 1 hour ago

MicoMico

285k31388778

answered 1 hour ago

MicoMico

285k31388778

2

Assuming the unit consists of two characters, you can do it in an expandable way:

documentclass{article}

usepackage{xparse}



ExplSyntaxOn



NewExpandableDocumentCommand{getnumber}{m}

 {

  tl_range:nnn { #1 } { 1 } { -3 } % from the first to the last but two character

 }



ExplSyntaxOff



begin{document}



getnumber{12pt}, $getnumber{-47km}$, getnumber{+5.7in}, getnumber{3,14159CM}



end{document}

share|improve this answer

answered 1 hour ago

egregegreg

731k8819293244

add a comment | 

2

Assuming the unit consists of two characters, you can do it in an expandable way:

documentclass{article}

usepackage{xparse}



ExplSyntaxOn



NewExpandableDocumentCommand{getnumber}{m}

 {

  tl_range:nnn { #1 } { 1 } { -3 } % from the first to the last but two character

 }



ExplSyntaxOff



begin{document}



getnumber{12pt}, $getnumber{-47km}$, getnumber{+5.7in}, getnumber{3,14159CM}



end{document}

share|improve this answer

answered 1 hour ago

egregegreg

731k8819293244

add a comment | 

Assuming the unit consists of two characters, you can do it in an expandable way:

documentclass{article}

usepackage{xparse}



ExplSyntaxOn



NewExpandableDocumentCommand{getnumber}{m}

 {

  tl_range:nnn { #1 } { 1 } { -3 } % from the first to the last but two character

 }



ExplSyntaxOff



begin{document}



getnumber{12pt}, $getnumber{-47km}$, getnumber{+5.7in}, getnumber{3,14159CM}



end{document}

share|improve this answer

answered 1 hour ago

egregegreg

731k8819293244

documentclass{article}

usepackage{xparse}



ExplSyntaxOn



NewExpandableDocumentCommand{getnumber}{m}

 {

  tl_range:nnn { #1 } { 1 } { -3 } % from the first to the last but two character

 }



ExplSyntaxOff



begin{document}



getnumber{12pt}, $getnumber{-47km}$, getnumber{+5.7in}, getnumber{3,14159CM}



end{document}

share|improve this answer

answered 1 hour ago

egregegreg

731k8819293244

answered 1 hour ago

egregegreg

731k8819293244

answered 1 hour ago

egregegreg

731k8819293244

1

pgf does that without the need to invoke external programs and converts the units into points.

documentclass{article}

usepackage{pgf}



newcommand{cmd}[1]{pgfmathparse{#1}pgfmathresult} 

begin{document}

    cmd{12pt} cmd{1cm} 

end{document}

Note that if you're bugged by the .0: this can easily be removed with pgfmathprintnumber[<your number format here>]{pgfmathresult} if you choose a number format that you like.

share|improve this answer

answered 1 hour ago

marmotmarmot

113k5145275

add a comment | 

1

pgf does that without the need to invoke external programs and converts the units into points.

documentclass{article}

usepackage{pgf}



newcommand{cmd}[1]{pgfmathparse{#1}pgfmathresult} 

begin{document}

    cmd{12pt} cmd{1cm} 

end{document}

Note that if you're bugged by the .0: this can easily be removed with pgfmathprintnumber[<your number format here>]{pgfmathresult} if you choose a number format that you like.

share|improve this answer

answered 1 hour ago

marmotmarmot

113k5145275

add a comment | 

pgf does that without the need to invoke external programs and converts the units into points.

documentclass{article}

usepackage{pgf}



newcommand{cmd}[1]{pgfmathparse{#1}pgfmathresult} 

begin{document}

    cmd{12pt} cmd{1cm} 

end{document}

Note that if you're bugged by the .0: this can easily be removed with pgfmathprintnumber[<your number format here>]{pgfmathresult} if you choose a number format that you like.

share|improve this answer

answered 1 hour ago

marmotmarmot

113k5145275

documentclass{article}

usepackage{pgf}



newcommand{cmd}[1]{pgfmathparse{#1}pgfmathresult} 

begin{document}

    cmd{12pt} cmd{1cm} 

end{document}

share|improve this answer

answered 1 hour ago

marmotmarmot

113k5145275

answered 1 hour ago

marmotmarmot

113k5145275

answered 1 hour ago

marmotmarmot

113k5145275