What does nop mean and how to use it












4















I wonder what does the nop mean, and how does it work? I Googled it but couldn't find a good answer, for example, I found something like:



newcommand{nop}[1]{}


in my .tex file, so what does it mean?






macros







share|improve this question





























    4















    I wonder what does the nop mean, and how does it work? I Googled it but couldn't find a good answer, for example, I found something like:



    newcommand{nop}[1]{}


    in my .tex file, so what does it mean?






    macros







    share|improve this question



























      4












      4








      4








      I wonder what does the nop mean, and how does it work? I Googled it but couldn't find a good answer, for example, I found something like:



      newcommand{nop}[1]{}


      in my .tex file, so what does it mean?






      macros







      share|improve this question
















      I wonder what does the nop mean, and how does it work? I Googled it but couldn't find a good answer, for example, I found something like:



      newcommand{nop}[1]{}


      in my .tex file, so what does it mean?






      macros




      macros






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Apr 16 '13 at 14:34









      Werner

      448k709921697




      448k709921697










      asked Apr 16 '13 at 14:32









      daiyuedaiyue

      2672512




      2672512






















          1 Answer
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          6














          In your example, nop is defined to take a single argument and do nothing with it. As such, nop literally translates to "perform no operation", or "gobble your argument". In fact, there exists a similar core macro @gobble (and friends) which does exactly the same (from latex.ltx:



          longdef @gobble #1{}
          
longdef @gobbletwo #1#2{}
          
longdef @gobblefour #1#2#3#4{}


          The first gobbles a single argument, making @gobble{<anything>} expand to nothing. The second gobbles two arguments, making @gobbletwo{<anything>}{<anything>} expand to nothing, and so on.



          What's the use case here? Well, perhaps you define a macro that writes something in the margin, like a "to do" note:



          newcommand{mymacro}[1]{marginpar{Do #1}}


          Now, later in your production, you decide that this operation is no longer valid/useful. So, you can make mymacro act like nop and do nothing, which allows you to leave your code as-is:



          letmymacronop


          or, at definition in your preamble, change it to a no-op:



          newcommand{mymacro}[1]{}





          share|improve this answer
























          • another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

            – daiyue
            Apr 16 '13 at 14:46








          • 1





            @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

            – barbara beeton
            Apr 16 '13 at 14:52











          • Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

            – mafp
            Apr 16 '13 at 15:49











          • The nop definition in the question, produces an extra space.

            – ctrl-alt-delor
            Jul 8 '18 at 17:35











          • @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

            – Werner
            Jul 8 '18 at 18:41











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          1 Answer
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          active

          oldest

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          6














          In your example, nop is defined to take a single argument and do nothing with it. As such, nop literally translates to "perform no operation", or "gobble your argument". In fact, there exists a similar core macro @gobble (and friends) which does exactly the same (from latex.ltx:



          longdef @gobble #1{}
          
longdef @gobbletwo #1#2{}
          
longdef @gobblefour #1#2#3#4{}


          The first gobbles a single argument, making @gobble{<anything>} expand to nothing. The second gobbles two arguments, making @gobbletwo{<anything>}{<anything>} expand to nothing, and so on.



          What's the use case here? Well, perhaps you define a macro that writes something in the margin, like a "to do" note:



          newcommand{mymacro}[1]{marginpar{Do #1}}


          Now, later in your production, you decide that this operation is no longer valid/useful. So, you can make mymacro act like nop and do nothing, which allows you to leave your code as-is:



          letmymacronop


          or, at definition in your preamble, change it to a no-op:



          newcommand{mymacro}[1]{}





          share|improve this answer
























          • another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

            – daiyue
            Apr 16 '13 at 14:46








          • 1





            @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

            – barbara beeton
            Apr 16 '13 at 14:52











          • Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

            – mafp
            Apr 16 '13 at 15:49











          • The nop definition in the question, produces an extra space.

            – ctrl-alt-delor
            Jul 8 '18 at 17:35











          • @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

            – Werner
            Jul 8 '18 at 18:41
















          6














          In your example, nop is defined to take a single argument and do nothing with it. As such, nop literally translates to "perform no operation", or "gobble your argument". In fact, there exists a similar core macro @gobble (and friends) which does exactly the same (from latex.ltx:



          longdef @gobble #1{}
          
longdef @gobbletwo #1#2{}
          
longdef @gobblefour #1#2#3#4{}


          The first gobbles a single argument, making @gobble{<anything>} expand to nothing. The second gobbles two arguments, making @gobbletwo{<anything>}{<anything>} expand to nothing, and so on.



          What's the use case here? Well, perhaps you define a macro that writes something in the margin, like a "to do" note:



          newcommand{mymacro}[1]{marginpar{Do #1}}


          Now, later in your production, you decide that this operation is no longer valid/useful. So, you can make mymacro act like nop and do nothing, which allows you to leave your code as-is:



          letmymacronop


          or, at definition in your preamble, change it to a no-op:



          newcommand{mymacro}[1]{}





          share|improve this answer
























          • another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

            – daiyue
            Apr 16 '13 at 14:46








          • 1





            @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

            – barbara beeton
            Apr 16 '13 at 14:52











          • Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

            – mafp
            Apr 16 '13 at 15:49











          • The nop definition in the question, produces an extra space.

            – ctrl-alt-delor
            Jul 8 '18 at 17:35











          • @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

            – Werner
            Jul 8 '18 at 18:41














          6












          6








          6







          In your example, nop is defined to take a single argument and do nothing with it. As such, nop literally translates to "perform no operation", or "gobble your argument". In fact, there exists a similar core macro @gobble (and friends) which does exactly the same (from latex.ltx:



          longdef @gobble #1{}
          
longdef @gobbletwo #1#2{}
          
longdef @gobblefour #1#2#3#4{}


          The first gobbles a single argument, making @gobble{<anything>} expand to nothing. The second gobbles two arguments, making @gobbletwo{<anything>}{<anything>} expand to nothing, and so on.



          What's the use case here? Well, perhaps you define a macro that writes something in the margin, like a "to do" note:



          newcommand{mymacro}[1]{marginpar{Do #1}}


          Now, later in your production, you decide that this operation is no longer valid/useful. So, you can make mymacro act like nop and do nothing, which allows you to leave your code as-is:



          letmymacronop


          or, at definition in your preamble, change it to a no-op:



          newcommand{mymacro}[1]{}





          share|improve this answer













          In your example, nop is defined to take a single argument and do nothing with it. As such, nop literally translates to "perform no operation", or "gobble your argument". In fact, there exists a similar core macro @gobble (and friends) which does exactly the same (from latex.ltx:



          longdef @gobble #1{}
          
longdef @gobbletwo #1#2{}
          
longdef @gobblefour #1#2#3#4{}


          The first gobbles a single argument, making @gobble{<anything>} expand to nothing. The second gobbles two arguments, making @gobbletwo{<anything>}{<anything>} expand to nothing, and so on.



          What's the use case here? Well, perhaps you define a macro that writes something in the margin, like a "to do" note:



          newcommand{mymacro}[1]{marginpar{Do #1}}


          Now, later in your production, you decide that this operation is no longer valid/useful. So, you can make mymacro act like nop and do nothing, which allows you to leave your code as-is:



          letmymacronop


          or, at definition in your preamble, change it to a no-op:



          newcommand{mymacro}[1]{}






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Apr 16 '13 at 14:37









          WernerWerner

          448k709921697




          448k709921697













          • another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

            – daiyue
            Apr 16 '13 at 14:46








          • 1





            @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

            – barbara beeton
            Apr 16 '13 at 14:52











          • Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

            – mafp
            Apr 16 '13 at 15:49











          • The nop definition in the question, produces an extra space.

            – ctrl-alt-delor
            Jul 8 '18 at 17:35











          • @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

            – Werner
            Jul 8 '18 at 18:41



















          • another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

            – daiyue
            Apr 16 '13 at 14:46








          • 1





            @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

            – barbara beeton
            Apr 16 '13 at 14:52











          • Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

            – mafp
            Apr 16 '13 at 15:49











          • The nop definition in the question, produces an extra space.

            – ctrl-alt-delor
            Jul 8 '18 at 17:35











          • @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

            – Werner
            Jul 8 '18 at 18:41

















          another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

          – daiyue
          Apr 16 '13 at 14:46







          another thing that confused me is that any paragraph that is enclosed in this nop{} command using the macro in the example, is disappeared, so i wonder why.

          – daiyue
          Apr 16 '13 at 14:46






          1




          1





          @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

          – barbara beeton
          Apr 16 '13 at 14:52





          @daiyue -- making anything presented as an argument to nop disappear is exactly its purpose.

          – barbara beeton
          Apr 16 '13 at 14:52













          Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

          – mafp
          Apr 16 '13 at 15:49





          Something like nop is also frequently used in conjunction with BibTeX to fix the sorting order.

          – mafp
          Apr 16 '13 at 15:49













          The nop definition in the question, produces an extra space.

          – ctrl-alt-delor
          Jul 8 '18 at 17:35





          The nop definition in the question, produces an extra space.

          – ctrl-alt-delor
          Jul 8 '18 at 17:35













          @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

          – Werner
          Jul 8 '18 at 18:41





          @ctrl-alt-delor: you can add ignorespaces or unskip or use a trailing %.

          – Werner
          Jul 8 '18 at 18:41


















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