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



The Next CEO of Stack OverflowA macro that expands to the length of its argumentMeasuring the distance from text to the top of the pageHow to add a unit to a command argument?Extracting the basename from a filepath argumentWrapper for siunitx' SI macro to automatically split number and unitHow do I use an auxilliary file for my own commands?Is there an `ex` unit equivalent for the capital 'X' in LaTeXDuplicate and modify section hierarchyMultiple Choice Answer Key in exam package at the end of documentCan one use the Potrzebie unit system in (La)TeX?










3















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:



documentclassarticle
usepackage[utf8]inputenc

newcommandcmd[1]#1 % change here to capture only the number.
begindocument
cmd12pt % print 12pt while I would get only 12, in a generic case.
enddocument









share|improve this question
























  • documentclassarticle defcmd#1pt#1 begindocument cmd12pt enddocument

    – marmot
    5 hours ago












  • @marmot - That'll work for pt as the unit, but for em, mm, km, etc. :-)

    – Mico
    3 hours ago












  • @Mico Yes, I know. But it does answer the question.

    – marmot
    3 hours ago















3















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:



documentclassarticle
usepackage[utf8]inputenc

newcommandcmd[1]#1 % change here to capture only the number.
begindocument
cmd12pt % print 12pt while I would get only 12, in a generic case.
enddocument









share|improve this question
























  • documentclassarticle defcmd#1pt#1 begindocument cmd12pt enddocument

    – marmot
    5 hours ago












  • @marmot - That'll work for pt as the unit, but for em, mm, km, etc. :-)

    – Mico
    3 hours ago












  • @Mico Yes, I know. But it does answer the question.

    – marmot
    3 hours ago













3












3








3


0






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:



documentclassarticle
usepackage[utf8]inputenc

newcommandcmd[1]#1 % change here to capture only the number.
begindocument
cmd12pt % print 12pt while I would get only 12, in a generic case.
enddocument









share|improve this question
















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:



documentclassarticle
usepackage[utf8]inputenc

newcommandcmd[1]#1 % change here to capture only the number.
begindocument
cmd12pt % print 12pt while I would get only 12, in a generic case.
enddocument






macros lengths unit-of-measure






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 5 hours ago









Bernard

175k776207




175k776207










asked 5 hours ago









R. NR. N

318214




318214












  • documentclassarticle defcmd#1pt#1 begindocument cmd12pt enddocument

    – marmot
    5 hours ago












  • @marmot - That'll work for pt as the unit, but for em, mm, km, etc. :-)

    – Mico
    3 hours ago












  • @Mico Yes, I know. But it does answer the question.

    – marmot
    3 hours ago

















  • documentclassarticle defcmd#1pt#1 begindocument cmd12pt enddocument

    – marmot
    5 hours ago












  • @marmot - That'll work for pt as the unit, but for em, mm, km, etc. :-)

    – Mico
    3 hours ago












  • @Mico Yes, I know. But it does answer the question.

    – marmot
    3 hours ago
















documentclassarticle defcmd#1pt#1 begindocument cmd12pt enddocument

– marmot
5 hours ago






documentclassarticle defcmd#1pt#1 begindocument cmd12pt enddocument

– marmot
5 hours ago














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

– Mico
3 hours ago






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

– Mico
3 hours ago














@Mico Yes, I know. But it does answer the question.

– marmot
3 hours ago





@Mico Yes, I know. But it does answer the question.

– marmot
3 hours ago










3 Answers
3






active

oldest

votes


















4














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



documentclassarticle
usepackagexparse

ExplSyntaxOn

NewExpandableDocumentCommandgetnumberm

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


ExplSyntaxOff

begindocument

getnumber12pt, $getnumber-47km$, getnumber+5.7in, getnumber3,14159CM

enddocument


enter image description here






share|improve this answer






























    3














    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 argXX55km is 55, and the output of cmdkm is blank (empty).



    enter image description here



    % !TEX TS-program = lualatex
    documentclassarticle
    usepackageluacode % for 'luacode' environment
    beginluacode
    function get_num ( s )
    tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )
    end
    endluacode
    newcommandcmd[1]directluaget_num("#1") % "wrapper" macro

    begindocument
    cmd12pt, $cmd-47km$, cmd+5.7in, cmd3,14159CM
    enddocument





    share|improve this answer
































      2














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



      documentclassarticle
      usepackagepgf

      newcommandcmd[1]pgfmathparse#1pgfmathresult
      begindocument
      cmd12pt cmd1cm
      enddocument


      enter image description here



      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























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        3 Answers
        3






        active

        oldest

        votes








        3 Answers
        3






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        4














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



        documentclassarticle
        usepackagexparse

        ExplSyntaxOn

        NewExpandableDocumentCommandgetnumberm

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


        ExplSyntaxOff

        begindocument

        getnumber12pt, $getnumber-47km$, getnumber+5.7in, getnumber3,14159CM

        enddocument


        enter image description here






        share|improve this answer



























          4














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



          documentclassarticle
          usepackagexparse

          ExplSyntaxOn

          NewExpandableDocumentCommandgetnumberm

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


          ExplSyntaxOff

          begindocument

          getnumber12pt, $getnumber-47km$, getnumber+5.7in, getnumber3,14159CM

          enddocument


          enter image description here






          share|improve this answer

























            4












            4








            4







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



            documentclassarticle
            usepackagexparse

            ExplSyntaxOn

            NewExpandableDocumentCommandgetnumberm

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


            ExplSyntaxOff

            begindocument

            getnumber12pt, $getnumber-47km$, getnumber+5.7in, getnumber3,14159CM

            enddocument


            enter image description here






            share|improve this answer













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



            documentclassarticle
            usepackagexparse

            ExplSyntaxOn

            NewExpandableDocumentCommandgetnumberm

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


            ExplSyntaxOff

            begindocument

            getnumber12pt, $getnumber-47km$, getnumber+5.7in, getnumber3,14159CM

            enddocument


            enter image description here







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 3 hours ago









            egregegreg

            731k8819293245




            731k8819293245





















                3














                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 argXX55km is 55, and the output of cmdkm is blank (empty).



                enter image description here



                % !TEX TS-program = lualatex
                documentclassarticle
                usepackageluacode % for 'luacode' environment
                beginluacode
                function get_num ( s )
                tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )
                end
                endluacode
                newcommandcmd[1]directluaget_num("#1") % "wrapper" macro

                begindocument
                cmd12pt, $cmd-47km$, cmd+5.7in, cmd3,14159CM
                enddocument





                share|improve this answer





























                  3














                  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 argXX55km is 55, and the output of cmdkm is blank (empty).



                  enter image description here



                  % !TEX TS-program = lualatex
                  documentclassarticle
                  usepackageluacode % for 'luacode' environment
                  beginluacode
                  function get_num ( s )
                  tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )
                  end
                  endluacode
                  newcommandcmd[1]directluaget_num("#1") % "wrapper" macro

                  begindocument
                  cmd12pt, $cmd-47km$, cmd+5.7in, cmd3,14159CM
                  enddocument





                  share|improve this answer



























                    3












                    3








                    3







                    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 argXX55km is 55, and the output of cmdkm is blank (empty).



                    enter image description here



                    % !TEX TS-program = lualatex
                    documentclassarticle
                    usepackageluacode % for 'luacode' environment
                    beginluacode
                    function get_num ( s )
                    tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )
                    end
                    endluacode
                    newcommandcmd[1]directluaget_num("#1") % "wrapper" macro

                    begindocument
                    cmd12pt, $cmd-47km$, cmd+5.7in, cmd3,14159CM
                    enddocument





                    share|improve this answer















                    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 argXX55km is 55, and the output of cmdkm is blank (empty).



                    enter image description here



                    % !TEX TS-program = lualatex
                    documentclassarticle
                    usepackageluacode % for 'luacode' environment
                    beginluacode
                    function get_num ( s )
                    tex.sprint ( ( s:gsub ( "([%d%.%,%-%+]*)([%a%s]*)" , "%1" ) ) )
                    end
                    endluacode
                    newcommandcmd[1]directluaget_num("#1") % "wrapper" macro

                    begindocument
                    cmd12pt, $cmd-47km$, cmd+5.7in, cmd3,14159CM
                    enddocument






                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited 3 hours ago

























                    answered 4 hours ago









                    MicoMico

                    285k31388778




                    285k31388778





















                        2














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



                        documentclassarticle
                        usepackagepgf

                        newcommandcmd[1]pgfmathparse#1pgfmathresult
                        begindocument
                        cmd12pt cmd1cm
                        enddocument


                        enter image description here



                        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



























                          2














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



                          documentclassarticle
                          usepackagepgf

                          newcommandcmd[1]pgfmathparse#1pgfmathresult
                          begindocument
                          cmd12pt cmd1cm
                          enddocument


                          enter image description here



                          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

























                            2












                            2








                            2







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



                            documentclassarticle
                            usepackagepgf

                            newcommandcmd[1]pgfmathparse#1pgfmathresult
                            begindocument
                            cmd12pt cmd1cm
                            enddocument


                            enter image description here



                            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













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



                            documentclassarticle
                            usepackagepgf

                            newcommandcmd[1]pgfmathparse#1pgfmathresult
                            begindocument
                            cmd12pt cmd1cm
                            enddocument


                            enter image description here



                            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












                            share|improve this answer



                            share|improve this answer










                            answered 3 hours ago









                            marmotmarmot

                            113k5145275




                            113k5145275



























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