Reverse an existing big math operator keeping same functionality (such as limits)

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2
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I would like to define an operator rsum which has all the same functionality of sum with the only difference being that rsum displays a mirrored image of the sigma glyph.




I have found the following questions which each address a part of what I want:



How are big operators defined?



Reversed letters in a mathematical formula



However, I'm having difficulty in marrying the two accepted answers into a single solution. How would I go about accomplishing this? (An answer to this question doesn't necessarily have to use the approaches in the other questions.)



I don't anticipate using custom fonts for this purpose, but the capability to do so wouldn't be unappreciated (if not by me by someone in the future, I'm sure).






math-mode graphics amsmath math-operators







share|improve this question

























    up vote
    2
    down vote

    favorite













    I would like to define an operator rsum which has all the same functionality of sum with the only difference being that rsum displays a mirrored image of the sigma glyph.




    I have found the following questions which each address a part of what I want:



    How are big operators defined?



    Reversed letters in a mathematical formula



    However, I'm having difficulty in marrying the two accepted answers into a single solution. How would I go about accomplishing this? (An answer to this question doesn't necessarily have to use the approaches in the other questions.)



    I don't anticipate using custom fonts for this purpose, but the capability to do so wouldn't be unappreciated (if not by me by someone in the future, I'm sure).






    math-mode graphics amsmath math-operators







    share|improve this question























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite












      I would like to define an operator rsum which has all the same functionality of sum with the only difference being that rsum displays a mirrored image of the sigma glyph.




      I have found the following questions which each address a part of what I want:



      How are big operators defined?



      Reversed letters in a mathematical formula



      However, I'm having difficulty in marrying the two accepted answers into a single solution. How would I go about accomplishing this? (An answer to this question doesn't necessarily have to use the approaches in the other questions.)



      I don't anticipate using custom fonts for this purpose, but the capability to do so wouldn't be unappreciated (if not by me by someone in the future, I'm sure).






      math-mode graphics amsmath math-operators







      share|improve this question














      I would like to define an operator rsum which has all the same functionality of sum with the only difference being that rsum displays a mirrored image of the sigma glyph.




      I have found the following questions which each address a part of what I want:



      How are big operators defined?



      Reversed letters in a mathematical formula



      However, I'm having difficulty in marrying the two accepted answers into a single solution. How would I go about accomplishing this? (An answer to this question doesn't necessarily have to use the approaches in the other questions.)



      I don't anticipate using custom fonts for this purpose, but the capability to do so wouldn't be unappreciated (if not by me by someone in the future, I'm sure).






      math-mode graphics amsmath math-operators




      math-mode graphics amsmath math-operators






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 4 hours ago









      Robert Wolfe

      1205




      1205




















          1 Answer
          1






          active

          oldest

          votes

















          up vote
          3
          down vote



          accepted










          Well, it's almost automatic. ;-)



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$
          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          enddocument


          enter image description here



          The main idea is to reflect the symbol in the appropriate math style; some bells and whistles for amsmath have been added.



          Should you need also rotated versions, here they are:



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$

          newcommandusumDOTSBusum@slimits@
          newcommandusum@mathopmathpaletteudsum@@90
          newcommanddsumDOTSBdsum@slimits@
          newcommanddsum@mathopmathpaletteudsum@@-90
          newcommandudsum@@[2]%
           vcenter%
           sboxz@$m@th#1sum@$%
           hbox to wdz@%
           hss
           resizeboxifxdisplaystyle#1else0.9fiwdz@dimexprhtz@%
           rotatebox[origin=c]#2$m@th#1sum@$%
           %
           hss
           %
           %

          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          [
          sum_i=1^nusum_i=1^n
          qquad
          textstyle
          sum_i=1^nusum_i=1^n
          ]

          [
          sum_i=1^ndsum_i=1^n
          qquad
          textstyle
          sum_i=1^ndsum_i=1^n
          ]

          enddocument


          enter image description here






          share|improve this answer






















          • Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
            – Robert Wolfe
            4 hours ago










          • May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
            – Manuel
            3 hours ago











          • @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
            – egreg
            3 hours ago











          • It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
            – Robert Wolfe
            1 hour ago










          Your Answer







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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          3
          down vote



          accepted










          Well, it's almost automatic. ;-)



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$
          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          enddocument


          enter image description here



          The main idea is to reflect the symbol in the appropriate math style; some bells and whistles for amsmath have been added.



          Should you need also rotated versions, here they are:



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$

          newcommandusumDOTSBusum@slimits@
          newcommandusum@mathopmathpaletteudsum@@90
          newcommanddsumDOTSBdsum@slimits@
          newcommanddsum@mathopmathpaletteudsum@@-90
          newcommandudsum@@[2]%
           vcenter%
           sboxz@$m@th#1sum@$%
           hbox to wdz@%
           hss
           resizeboxifxdisplaystyle#1else0.9fiwdz@dimexprhtz@%
           rotatebox[origin=c]#2$m@th#1sum@$%
           %
           hss
           %
           %

          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          [
          sum_i=1^nusum_i=1^n
          qquad
          textstyle
          sum_i=1^nusum_i=1^n
          ]

          [
          sum_i=1^ndsum_i=1^n
          qquad
          textstyle
          sum_i=1^ndsum_i=1^n
          ]

          enddocument


          enter image description here






          share|improve this answer






















          • Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
            – Robert Wolfe
            4 hours ago










          • May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
            – Manuel
            3 hours ago











          • @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
            – egreg
            3 hours ago











          • It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
            – Robert Wolfe
            1 hour ago














          up vote
          3
          down vote



          accepted










          Well, it's almost automatic. ;-)



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$
          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          enddocument


          enter image description here



          The main idea is to reflect the symbol in the appropriate math style; some bells and whistles for amsmath have been added.



          Should you need also rotated versions, here they are:



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$

          newcommandusumDOTSBusum@slimits@
          newcommandusum@mathopmathpaletteudsum@@90
          newcommanddsumDOTSBdsum@slimits@
          newcommanddsum@mathopmathpaletteudsum@@-90
          newcommandudsum@@[2]%
           vcenter%
           sboxz@$m@th#1sum@$%
           hbox to wdz@%
           hss
           resizeboxifxdisplaystyle#1else0.9fiwdz@dimexprhtz@%
           rotatebox[origin=c]#2$m@th#1sum@$%
           %
           hss
           %
           %

          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          [
          sum_i=1^nusum_i=1^n
          qquad
          textstyle
          sum_i=1^nusum_i=1^n
          ]

          [
          sum_i=1^ndsum_i=1^n
          qquad
          textstyle
          sum_i=1^ndsum_i=1^n
          ]

          enddocument


          enter image description here






          share|improve this answer






















          • Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
            – Robert Wolfe
            4 hours ago










          • May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
            – Manuel
            3 hours ago











          • @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
            – egreg
            3 hours ago











          • It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
            – Robert Wolfe
            1 hour ago












          up vote
          3
          down vote



          accepted







          up vote
          3
          down vote



          accepted






          Well, it's almost automatic. ;-)



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$
          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          enddocument


          enter image description here



          The main idea is to reflect the symbol in the appropriate math style; some bells and whistles for amsmath have been added.



          Should you need also rotated versions, here they are:



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$

          newcommandusumDOTSBusum@slimits@
          newcommandusum@mathopmathpaletteudsum@@90
          newcommanddsumDOTSBdsum@slimits@
          newcommanddsum@mathopmathpaletteudsum@@-90
          newcommandudsum@@[2]%
           vcenter%
           sboxz@$m@th#1sum@$%
           hbox to wdz@%
           hss
           resizeboxifxdisplaystyle#1else0.9fiwdz@dimexprhtz@%
           rotatebox[origin=c]#2$m@th#1sum@$%
           %
           hss
           %
           %

          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          [
          sum_i=1^nusum_i=1^n
          qquad
          textstyle
          sum_i=1^nusum_i=1^n
          ]

          [
          sum_i=1^ndsum_i=1^n
          qquad
          textstyle
          sum_i=1^ndsum_i=1^n
          ]

          enddocument


          enter image description here






          share|improve this answer














          Well, it's almost automatic. ;-)



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$
          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          enddocument


          enter image description here



          The main idea is to reflect the symbol in the appropriate math style; some bells and whistles for amsmath have been added.



          Should you need also rotated versions, here they are:



          documentclassarticle
          usepackageamsmath
          usepackagegraphicx

          makeatletter
          newcommandrsumDOTSBrsum@slimits@
          newcommandrsum@mathopmathpalettersum@@relax
          newcommandrsum@@[2]reflectbox$m@th#1sum@$

          newcommandusumDOTSBusum@slimits@
          newcommandusum@mathopmathpaletteudsum@@90
          newcommanddsumDOTSBdsum@slimits@
          newcommanddsum@mathopmathpaletteudsum@@-90
          newcommandudsum@@[2]%
           vcenter%
           sboxz@$m@th#1sum@$%
           hbox to wdz@%
           hss
           resizeboxifxdisplaystyle#1else0.9fiwdz@dimexprhtz@%
           rotatebox[origin=c]#2$m@th#1sum@$%
           %
           hss
           %
           %

          makeatother

          begindocument

          [
          sum_i=1^nrsum_i=1^n
          qquad
          textstyle
          sum_i=1^nrsum_i=1^n
          ]

          [
          sum_i=1^nusum_i=1^n
          qquad
          textstyle
          sum_i=1^nusum_i=1^n
          ]

          [
          sum_i=1^ndsum_i=1^n
          qquad
          textstyle
          sum_i=1^ndsum_i=1^n
          ]

          enddocument


          enter image description here







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 3 hours ago

























          answered 4 hours ago









          egreg

          690k8518373086




          690k8518373086











          • Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
            – Robert Wolfe
            4 hours ago










          • May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
            – Manuel
            3 hours ago











          • @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
            – egreg
            3 hours ago











          • It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
            – Robert Wolfe
            1 hour ago
















          • Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
            – Robert Wolfe
            4 hours ago










          • May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
            – Manuel
            3 hours ago











          • @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
            – egreg
            3 hours ago











          • It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
            – Robert Wolfe
            1 hour ago















          Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
          – Robert Wolfe
          4 hours ago




          Can't imagine a sleeker approach showing up. But I'll hold my breath to accept this just yet. Thanks!
          – Robert Wolfe
          4 hours ago












          May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
          – Manuel
          3 hours ago





          May be in r version rotatebox180 instead of reflectbox because of the width of different lines? And similar, in the u and d versions, may be those should be a rotation of a reflectbox (or a reflectbox of your rotation)?
          – Manuel
          3 hours ago













          @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
          – egreg
          3 hours ago





          @Manuel I tried the 180 degree rotation, but it's unsatisfying because of the different thickness of the horizontal strokes. All variations are possible, but the 90 degree rotated symbols are just a joke.
          – egreg
          3 hours ago













          It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
          – Robert Wolfe
          1 hour ago




          It might look stupid for Sigma, but someone might find it useful for a different symbol. I can usually alter a few lines of code from this site to tailor it for my needs. So, extra generality never hurts.
          – Robert Wolfe
          1 hour ago

















           

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