Change standard tex output of multiplication in maxima












2















We try to change the way maxima translates multiplication when converting to tex.



By default maxima gives a space: ,



We changed this to our own latex macro that looks like a space, but in that way we conserve the sementical meaning which makes it easier to convert the latex back to maxima.



:lisp (setf (get 'mtimes 'texsym) '("\invisibletimes "));


However, we have one problem, and that is when we put simplification on. We use this for generating steps in the explanation of a solution. For example:



tex1(block([simp: false], 2*3));


Of course when multiplying numbers we can want an explicit multiplication (cdot).



So we would like it that if both arguments of the multiplication are numbers, that we then have a cdot when translating to tex.



Is that possible?






maxima







share|improve this question





























    2















    We try to change the way maxima translates multiplication when converting to tex.



    By default maxima gives a space: ,



    We changed this to our own latex macro that looks like a space, but in that way we conserve the sementical meaning which makes it easier to convert the latex back to maxima.



    :lisp (setf (get 'mtimes 'texsym) '("\invisibletimes "));


    However, we have one problem, and that is when we put simplification on. We use this for generating steps in the explanation of a solution. For example:



    tex1(block([simp: false], 2*3));


    Of course when multiplying numbers we can want an explicit multiplication (cdot).



    So we would like it that if both arguments of the multiplication are numbers, that we then have a cdot when translating to tex.



    Is that possible?






    maxima







    share|improve this question



























      2












      2








      2








      We try to change the way maxima translates multiplication when converting to tex.



      By default maxima gives a space: ,



      We changed this to our own latex macro that looks like a space, but in that way we conserve the sementical meaning which makes it easier to convert the latex back to maxima.



      :lisp (setf (get 'mtimes 'texsym) '("\invisibletimes "));


      However, we have one problem, and that is when we put simplification on. We use this for generating steps in the explanation of a solution. For example:



      tex1(block([simp: false], 2*3));


      Of course when multiplying numbers we can want an explicit multiplication (cdot).



      So we would like it that if both arguments of the multiplication are numbers, that we then have a cdot when translating to tex.



      Is that possible?






      maxima







      share|improve this question
















      We try to change the way maxima translates multiplication when converting to tex.



      By default maxima gives a space: ,



      We changed this to our own latex macro that looks like a space, but in that way we conserve the sementical meaning which makes it easier to convert the latex back to maxima.



      :lisp (setf (get 'mtimes 'texsym) '("\invisibletimes "));


      However, we have one problem, and that is when we put simplification on. We use this for generating steps in the explanation of a solution. For example:



      tex1(block([simp: false], 2*3));


      Of course when multiplying numbers we can want an explicit multiplication (cdot).



      So we would like it that if both arguments of the multiplication are numbers, that we then have a cdot when translating to tex.



      Is that possible?






      maxima




      maxima






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 23 '18 at 9:24







      Kasper

















      asked Nov 21 '18 at 15:29









      KasperKasper

      2,63232139




      2,63232139
























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          Yes, if there is a function named by the TEX property, that function is called to process an expression. The function named by TEX takes 3 arguments, namely an expression with the same operator to which the TEX property is attached, stuff to the left, and stuff to the right, and the TEX function returns a list of strings which are the bits of TeX which should be output.



          You can say :lisp (trace tex-mtimes) to see how that works. You can see the functions attached to MTIMES or other operators by saying :lisp (symbol-plist 'mtimes) or in general :lisp (symbol-plist 'mfoo) for another MFOO operator.



          So if you replace TEX-MTIMES (by :lisp (setf (get 'mtimes 'tex) 'my-tex-mtimes)) by some other function, then you can control the output to a greater extent. Here is an outline of a suitable function for your purpose:



          (defun my-tex-mtimes (e l r)
          
   (if $simp
          
     (tex-nary e l r) ;; punt to default handler
          
     (tex-mtimes-special-case e l r)))


          You can make TEX-MTIMES-SPECIAL-CASE as complicated as you want. I assume that you can carry out the Lisp programming for that. The simplest thing to try, perhaps a point of departure for further efforts, is to just temporarily replace TEXSYM with cdot. Something like:



          (defun tex-mtimes-special-case (e l r)
          
  (let ((prev-texsym (get 'mtimes 'texsym)))
          
    (prog2 (setf (get 'mtimes 'texsym) (list "\cdot "))
          
      (tex-nary e l r)
          
      (setf (get 'mtimes 'texsym) prev-texsym))))





          share|improve this answer
























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            Yes, if there is a function named by the TEX property, that function is called to process an expression. The function named by TEX takes 3 arguments, namely an expression with the same operator to which the TEX property is attached, stuff to the left, and stuff to the right, and the TEX function returns a list of strings which are the bits of TeX which should be output.



            You can say :lisp (trace tex-mtimes) to see how that works. You can see the functions attached to MTIMES or other operators by saying :lisp (symbol-plist 'mtimes) or in general :lisp (symbol-plist 'mfoo) for another MFOO operator.



            So if you replace TEX-MTIMES (by :lisp (setf (get 'mtimes 'tex) 'my-tex-mtimes)) by some other function, then you can control the output to a greater extent. Here is an outline of a suitable function for your purpose:



            (defun my-tex-mtimes (e l r)
            
   (if $simp
            
     (tex-nary e l r) ;; punt to default handler
            
     (tex-mtimes-special-case e l r)))


            You can make TEX-MTIMES-SPECIAL-CASE as complicated as you want. I assume that you can carry out the Lisp programming for that. The simplest thing to try, perhaps a point of departure for further efforts, is to just temporarily replace TEXSYM with cdot. Something like:



            (defun tex-mtimes-special-case (e l r)
            
  (let ((prev-texsym (get 'mtimes 'texsym)))
            
    (prog2 (setf (get 'mtimes 'texsym) (list "\cdot "))
            
      (tex-nary e l r)
            
      (setf (get 'mtimes 'texsym) prev-texsym))))





            share|improve this answer




























              1














              Yes, if there is a function named by the TEX property, that function is called to process an expression. The function named by TEX takes 3 arguments, namely an expression with the same operator to which the TEX property is attached, stuff to the left, and stuff to the right, and the TEX function returns a list of strings which are the bits of TeX which should be output.



              You can say :lisp (trace tex-mtimes) to see how that works. You can see the functions attached to MTIMES or other operators by saying :lisp (symbol-plist 'mtimes) or in general :lisp (symbol-plist 'mfoo) for another MFOO operator.



              So if you replace TEX-MTIMES (by :lisp (setf (get 'mtimes 'tex) 'my-tex-mtimes)) by some other function, then you can control the output to a greater extent. Here is an outline of a suitable function for your purpose:



              (defun my-tex-mtimes (e l r)
              
   (if $simp
              
     (tex-nary e l r) ;; punt to default handler
              
     (tex-mtimes-special-case e l r)))


              You can make TEX-MTIMES-SPECIAL-CASE as complicated as you want. I assume that you can carry out the Lisp programming for that. The simplest thing to try, perhaps a point of departure for further efforts, is to just temporarily replace TEXSYM with cdot. Something like:



              (defun tex-mtimes-special-case (e l r)
              
  (let ((prev-texsym (get 'mtimes 'texsym)))
              
    (prog2 (setf (get 'mtimes 'texsym) (list "\cdot "))
              
      (tex-nary e l r)
              
      (setf (get 'mtimes 'texsym) prev-texsym))))





              share|improve this answer


























                1












                1








                1







                Yes, if there is a function named by the TEX property, that function is called to process an expression. The function named by TEX takes 3 arguments, namely an expression with the same operator to which the TEX property is attached, stuff to the left, and stuff to the right, and the TEX function returns a list of strings which are the bits of TeX which should be output.



                You can say :lisp (trace tex-mtimes) to see how that works. You can see the functions attached to MTIMES or other operators by saying :lisp (symbol-plist 'mtimes) or in general :lisp (symbol-plist 'mfoo) for another MFOO operator.



                So if you replace TEX-MTIMES (by :lisp (setf (get 'mtimes 'tex) 'my-tex-mtimes)) by some other function, then you can control the output to a greater extent. Here is an outline of a suitable function for your purpose:



                (defun my-tex-mtimes (e l r)
                
   (if $simp
                
     (tex-nary e l r) ;; punt to default handler
                
     (tex-mtimes-special-case e l r)))


                You can make TEX-MTIMES-SPECIAL-CASE as complicated as you want. I assume that you can carry out the Lisp programming for that. The simplest thing to try, perhaps a point of departure for further efforts, is to just temporarily replace TEXSYM with cdot. Something like:



                (defun tex-mtimes-special-case (e l r)
                
  (let ((prev-texsym (get 'mtimes 'texsym)))
                
    (prog2 (setf (get 'mtimes 'texsym) (list "\cdot "))
                
      (tex-nary e l r)
                
      (setf (get 'mtimes 'texsym) prev-texsym))))





                share|improve this answer













                Yes, if there is a function named by the TEX property, that function is called to process an expression. The function named by TEX takes 3 arguments, namely an expression with the same operator to which the TEX property is attached, stuff to the left, and stuff to the right, and the TEX function returns a list of strings which are the bits of TeX which should be output.



                You can say :lisp (trace tex-mtimes) to see how that works. You can see the functions attached to MTIMES or other operators by saying :lisp (symbol-plist 'mtimes) or in general :lisp (symbol-plist 'mfoo) for another MFOO operator.



                So if you replace TEX-MTIMES (by :lisp (setf (get 'mtimes 'tex) 'my-tex-mtimes)) by some other function, then you can control the output to a greater extent. Here is an outline of a suitable function for your purpose:



                (defun my-tex-mtimes (e l r)
                
   (if $simp
                
     (tex-nary e l r) ;; punt to default handler
                
     (tex-mtimes-special-case e l r)))


                You can make TEX-MTIMES-SPECIAL-CASE as complicated as you want. I assume that you can carry out the Lisp programming for that. The simplest thing to try, perhaps a point of departure for further efforts, is to just temporarily replace TEXSYM with cdot. Something like:



                (defun tex-mtimes-special-case (e l r)
                
  (let ((prev-texsym (get 'mtimes 'texsym)))
                
    (prog2 (setf (get 'mtimes 'texsym) (list "\cdot "))
                
      (tex-nary e l r)
                
      (setf (get 'mtimes 'texsym) prev-texsym))))






                share|improve this answer












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                share|improve this answer










                answered Nov 24 '18 at 17:45









                Robert DodierRobert Dodier

                11.4k11835




                11.4k11835
































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