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Problem using variables with feynmp fmffor

0

This is a follow-up to this question. The solution provided by egreg worked, but the same solution doesn't work when trying to update a variable within an fmffor loop. A complete example is shown below. The expected behavior is to produce two photons each bending in the opposite direction (right=+0.5, and right=-0.5), but instead temp is always set to +0.5 in the simple.mp file.

documentclass[border=2cm]{standalone}

usepackage{feynmp}

usepackage[pdftex]{graphicx}

usepackage{pgf}



DeclareGraphicsRule{*}{mps}{*}{}



begin{document}

begin{fmffile}{fgraphs}



newcommand{efmf}[1]{

  begingroupedefx{endgroupnoexpandfmf{#1}}x

}



begin{fmffile}{simple}

    begin{fmfgraph*}(450,320)

      fmftopn{t}{3}    fmfn{plain}{t}{3}

      fmfbottomn{b}{3} fmfn{plain}{b}{3}

      pgfmathsetmacro{temp}{-0.5}

      begin{fmffor}{n}{1}{1}{2}

        pgfmathsetmacro{temp}{temp+1}

    efmf{photon, foreground=blue, tension=0.1, right=temp}{t2,b2}

      end{fmffor}

    end{fmfgraph*}

end{fmffile}





end{fmffile}

end{document}

feynman feynmf feynmp

share|improve this question

asked 15 mins ago

user1247user1247

1133

New contributor

user1247 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If temp is -0.5, then temp+1 is 0.5. What's the problem? You're simply doing the vconnect operation twice with the same data.
  
  – egreg
  8 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Note that fmffor doesn't execute the body multiple times, but only writes code for a Metapost loop.
  
  – egreg
  2 mins ago
  
  
  

  
  
  
  

add a comment | 

0

This is a follow-up to this question. The solution provided by egreg worked, but the same solution doesn't work when trying to update a variable within an fmffor loop. A complete example is shown below. The expected behavior is to produce two photons each bending in the opposite direction (right=+0.5, and right=-0.5), but instead temp is always set to +0.5 in the simple.mp file.

documentclass[border=2cm]{standalone}

usepackage{feynmp}

usepackage[pdftex]{graphicx}

usepackage{pgf}



DeclareGraphicsRule{*}{mps}{*}{}



begin{document}

begin{fmffile}{fgraphs}



newcommand{efmf}[1]{

  begingroupedefx{endgroupnoexpandfmf{#1}}x

}



begin{fmffile}{simple}

    begin{fmfgraph*}(450,320)

      fmftopn{t}{3}    fmfn{plain}{t}{3}

      fmfbottomn{b}{3} fmfn{plain}{b}{3}

      pgfmathsetmacro{temp}{-0.5}

      begin{fmffor}{n}{1}{1}{2}

        pgfmathsetmacro{temp}{temp+1}

    efmf{photon, foreground=blue, tension=0.1, right=temp}{t2,b2}

      end{fmffor}

    end{fmfgraph*}

end{fmffile}





end{fmffile}

end{document}

feynman feynmf feynmp

share|improve this question

asked 15 mins ago

user1247user1247

1133

New contributor

user1247 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If temp is -0.5, then temp+1 is 0.5. What's the problem? You're simply doing the vconnect operation twice with the same data.
  
  – egreg
  8 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Note that fmffor doesn't execute the body multiple times, but only writes code for a Metapost loop.
  
  – egreg
  2 mins ago
  
  
  

  
  
  
  

add a comment | 

This is a follow-up to this question. The solution provided by egreg worked, but the same solution doesn't work when trying to update a variable within an fmffor loop. A complete example is shown below. The expected behavior is to produce two photons each bending in the opposite direction (right=+0.5, and right=-0.5), but instead temp is always set to +0.5 in the simple.mp file.

documentclass[border=2cm]{standalone}

usepackage{feynmp}

usepackage[pdftex]{graphicx}

usepackage{pgf}



DeclareGraphicsRule{*}{mps}{*}{}



begin{document}

begin{fmffile}{fgraphs}



newcommand{efmf}[1]{

  begingroupedefx{endgroupnoexpandfmf{#1}}x

}



begin{fmffile}{simple}

    begin{fmfgraph*}(450,320)

      fmftopn{t}{3}    fmfn{plain}{t}{3}

      fmfbottomn{b}{3} fmfn{plain}{b}{3}

      pgfmathsetmacro{temp}{-0.5}

      begin{fmffor}{n}{1}{1}{2}

        pgfmathsetmacro{temp}{temp+1}

    efmf{photon, foreground=blue, tension=0.1, right=temp}{t2,b2}

      end{fmffor}

    end{fmfgraph*}

end{fmffile}





end{fmffile}

end{document}

feynman feynmf feynmp

share|improve this question

asked 15 mins ago

user1247user1247

1133

New contributor

user1247 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

documentclass[border=2cm]{standalone}

usepackage{feynmp}

usepackage[pdftex]{graphicx}

usepackage{pgf}



DeclareGraphicsRule{*}{mps}{*}{}



begin{document}

begin{fmffile}{fgraphs}



newcommand{efmf}[1]{

  begingroupedefx{endgroupnoexpandfmf{#1}}x

}



begin{fmffile}{simple}

    begin{fmfgraph*}(450,320)

      fmftopn{t}{3}    fmfn{plain}{t}{3}

      fmfbottomn{b}{3} fmfn{plain}{b}{3}

      pgfmathsetmacro{temp}{-0.5}

      begin{fmffor}{n}{1}{1}{2}

        pgfmathsetmacro{temp}{temp+1}

    efmf{photon, foreground=blue, tension=0.1, right=temp}{t2,b2}

      end{fmffor}

    end{fmfgraph*}

end{fmffile}





end{fmffile}

end{document}

share|improve this question

asked 15 mins ago

user1247user1247

1133

New contributor

user1247 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 15 mins ago

user1247user1247

1133

New contributor

user1247 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 15 mins ago

user1247user1247

1133

New contributor

user1247 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 15 mins ago

user1247user1247

1133