Fail to invoke g(f(x))











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7
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I want to invoke g(f(x)) which is equal to x actually. However the following does not compile in PostScript stage (I think). Could you fix it? I am not asking how to plot y=x but how to invoke the composition function g(f(x)).



MWE



documentclass[pstricks,border=12pt]{standalone}
usepackage{pst-plot}
deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

begin{document}
begin{pspicture}[algebraic](-4,-4)(6,6)
psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
psset{linecolor=blue,linewidth=2pt}
psplot{-4}{5}{g(f(x))}
end{pspicture}
end{document}









share|improve this question


















  • 2




    Use deff#1{((#1-2)/(2*(#1)+1))} defg#1{((2+#1)/(1-2*(#1)))} and psplot{-4}{5}{g{f{x}}}, i.e. the usual curly braces instead of round ones. When you use deff(#1) you are using delimited arguments which have problems when you nest calls (like the [ and ] of optional arguments)
    – moewe
    Nov 18 at 5:53








  • 1




    It is the same situation as for begin{lstlisting}[language={[LaTeX]TeX}]. The inner [...] have to be braced.
    – Herbert
    2 days ago

















up vote
7
down vote

favorite












I want to invoke g(f(x)) which is equal to x actually. However the following does not compile in PostScript stage (I think). Could you fix it? I am not asking how to plot y=x but how to invoke the composition function g(f(x)).



MWE



documentclass[pstricks,border=12pt]{standalone}
usepackage{pst-plot}
deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

begin{document}
begin{pspicture}[algebraic](-4,-4)(6,6)
psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
psset{linecolor=blue,linewidth=2pt}
psplot{-4}{5}{g(f(x))}
end{pspicture}
end{document}









share|improve this question


















  • 2




    Use deff#1{((#1-2)/(2*(#1)+1))} defg#1{((2+#1)/(1-2*(#1)))} and psplot{-4}{5}{g{f{x}}}, i.e. the usual curly braces instead of round ones. When you use deff(#1) you are using delimited arguments which have problems when you nest calls (like the [ and ] of optional arguments)
    – moewe
    Nov 18 at 5:53








  • 1




    It is the same situation as for begin{lstlisting}[language={[LaTeX]TeX}]. The inner [...] have to be braced.
    – Herbert
    2 days ago















up vote
7
down vote

favorite









up vote
7
down vote

favorite











I want to invoke g(f(x)) which is equal to x actually. However the following does not compile in PostScript stage (I think). Could you fix it? I am not asking how to plot y=x but how to invoke the composition function g(f(x)).



MWE



documentclass[pstricks,border=12pt]{standalone}
usepackage{pst-plot}
deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

begin{document}
begin{pspicture}[algebraic](-4,-4)(6,6)
psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
psset{linecolor=blue,linewidth=2pt}
psplot{-4}{5}{g(f(x))}
end{pspicture}
end{document}









share|improve this question













I want to invoke g(f(x)) which is equal to x actually. However the following does not compile in PostScript stage (I think). Could you fix it? I am not asking how to plot y=x but how to invoke the composition function g(f(x)).



MWE



documentclass[pstricks,border=12pt]{standalone}
usepackage{pst-plot}
deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

begin{document}
begin{pspicture}[algebraic](-4,-4)(6,6)
psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
psset{linecolor=blue,linewidth=2pt}
psplot{-4}{5}{g(f(x))}
end{pspicture}
end{document}






pstricks






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asked Nov 18 at 5:39









Artificial Stupidity

4,5291832




4,5291832








  • 2




    Use deff#1{((#1-2)/(2*(#1)+1))} defg#1{((2+#1)/(1-2*(#1)))} and psplot{-4}{5}{g{f{x}}}, i.e. the usual curly braces instead of round ones. When you use deff(#1) you are using delimited arguments which have problems when you nest calls (like the [ and ] of optional arguments)
    – moewe
    Nov 18 at 5:53








  • 1




    It is the same situation as for begin{lstlisting}[language={[LaTeX]TeX}]. The inner [...] have to be braced.
    – Herbert
    2 days ago
















  • 2




    Use deff#1{((#1-2)/(2*(#1)+1))} defg#1{((2+#1)/(1-2*(#1)))} and psplot{-4}{5}{g{f{x}}}, i.e. the usual curly braces instead of round ones. When you use deff(#1) you are using delimited arguments which have problems when you nest calls (like the [ and ] of optional arguments)
    – moewe
    Nov 18 at 5:53








  • 1




    It is the same situation as for begin{lstlisting}[language={[LaTeX]TeX}]. The inner [...] have to be braced.
    – Herbert
    2 days ago










2




2




Use deff#1{((#1-2)/(2*(#1)+1))} defg#1{((2+#1)/(1-2*(#1)))} and psplot{-4}{5}{g{f{x}}}, i.e. the usual curly braces instead of round ones. When you use deff(#1) you are using delimited arguments which have problems when you nest calls (like the [ and ] of optional arguments)
– moewe
Nov 18 at 5:53






Use deff#1{((#1-2)/(2*(#1)+1))} defg#1{((2+#1)/(1-2*(#1)))} and psplot{-4}{5}{g{f{x}}}, i.e. the usual curly braces instead of round ones. When you use deff(#1) you are using delimited arguments which have problems when you nest calls (like the [ and ] of optional arguments)
– moewe
Nov 18 at 5:53






1




1




It is the same situation as for begin{lstlisting}[language={[LaTeX]TeX}]. The inner [...] have to be braced.
– Herbert
2 days ago






It is the same situation as for begin{lstlisting}[language={[LaTeX]TeX}]. The inner [...] have to be braced.
– Herbert
2 days ago












1 Answer
1






active

oldest

votes

















up vote
10
down vote



accepted










The use of similar parameter text for f and g is what causes the problem here. The first occurrence of a (...) pair is used to extract the arguments. So, in



g(f(<x>))


passes the incomplete f(<x> as the argument to g. To get around this, brace the argument to avoid confusion:



enter image description here



documentclass{article}

usepackage{pst-plot}

deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

begin{document}

begin{pspicture}[algebraic](-4,-4)(6,6)
psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
psset{linecolor=blue,linewidth=2pt}
psplot{-4}{5}{g({f(x)})}
end{pspicture}

end{document}





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    1 Answer
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    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    10
    down vote



    accepted










    The use of similar parameter text for f and g is what causes the problem here. The first occurrence of a (...) pair is used to extract the arguments. So, in



    g(f(<x>))


    passes the incomplete f(<x> as the argument to g. To get around this, brace the argument to avoid confusion:



    enter image description here



    documentclass{article}

    usepackage{pst-plot}

    deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
    defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

    begin{document}

    begin{pspicture}[algebraic](-4,-4)(6,6)
    psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
    psset{linecolor=blue,linewidth=2pt}
    psplot{-4}{5}{g({f(x)})}
    end{pspicture}

    end{document}





    share|improve this answer

























      up vote
      10
      down vote



      accepted










      The use of similar parameter text for f and g is what causes the problem here. The first occurrence of a (...) pair is used to extract the arguments. So, in



      g(f(<x>))


      passes the incomplete f(<x> as the argument to g. To get around this, brace the argument to avoid confusion:



      enter image description here



      documentclass{article}

      usepackage{pst-plot}

      deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
      defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

      begin{document}

      begin{pspicture}[algebraic](-4,-4)(6,6)
      psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
      psset{linecolor=blue,linewidth=2pt}
      psplot{-4}{5}{g({f(x)})}
      end{pspicture}

      end{document}





      share|improve this answer























        up vote
        10
        down vote



        accepted







        up vote
        10
        down vote



        accepted






        The use of similar parameter text for f and g is what causes the problem here. The first occurrence of a (...) pair is used to extract the arguments. So, in



        g(f(<x>))


        passes the incomplete f(<x> as the argument to g. To get around this, brace the argument to avoid confusion:



        enter image description here



        documentclass{article}

        usepackage{pst-plot}

        deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
        defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

        begin{document}

        begin{pspicture}[algebraic](-4,-4)(6,6)
        psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
        psset{linecolor=blue,linewidth=2pt}
        psplot{-4}{5}{g({f(x)})}
        end{pspicture}

        end{document}





        share|improve this answer












        The use of similar parameter text for f and g is what causes the problem here. The first occurrence of a (...) pair is used to extract the arguments. So, in



        g(f(<x>))


        passes the incomplete f(<x> as the argument to g. To get around this, brace the argument to avoid confusion:



        enter image description here



        documentclass{article}

        usepackage{pst-plot}

        deff(#1){((#1-2)/(2*(#1)+1))}% y=f(x)
        defg(#1){((2+#1)/(1-2*(#1)))}% y=g(x) in which g is the inverse of f.

        begin{document}

        begin{pspicture}[algebraic](-4,-4)(6,6)
        psaxes{->}(0,0)(-4,-4)(5.5,5.5)[$x$,0][$y$,90]
        psset{linecolor=blue,linewidth=2pt}
        psplot{-4}{5}{g({f(x)})}
        end{pspicture}

        end{document}






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 18 at 5:58









        Werner

        431k599491626




        431k599491626






























             

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