How to save results to txt file using "display".

[DavyGriffin]

I tried to use "display > filename" to save my result to an txt file. The model could run, but I can not find the result file. Should I create a txt file with the same name first? Or should I add the extension after the filename? If you could show me a specific syntax example, that would be more helpful. Thank you very much.

[dominik...@googlemail.com]

set N1 := 1..2;
set N2 := 1..2;
set N3 := 1..2;
param X {i1 in N1,i2 in N2,i3 in N3} ;
let  {i1 in N1,i2 in N2,i3 in N3} X[i1,i2,i3] := i1+i2+i3;
display X;
display X >filename.txt;

[郭炜峰]

Thanks, I did the similar one. It can display in the Ampl window, but there was still no txt file. Or in another word, I can not find it. I'm not sure which part went wrong.

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[dominik...@googlemail.com]

if i run that code as i posted it, the file appears in the same folder as the file ampl.exe
e.g. C:\Program Files\ampl\

[Robert Fourer]

To have the filename end in .txt, you should include the .txt extension in the display statement; for example:

display >abc.txt;

The resulting file will be written to your AMPL program folder/directory, unless you have used AMPL's "cd" command to change to a different folder. The file will be created if it does not already exist.

Bob Fourer
am...@googlegroups.com

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[maziar kermani]

Hello,

I have a for loop in which I solve a problem "n" times and after each solve I would like to save the results to a file with a name output_n. However I would like to have the n be printed as 0001, 0002, ... 0100. I am trying with concatenating strings however I couldn't find any solution. I would appreciate if someone can help.

printf {j in 1.._nvars} "%s= %.3f\n", _varname[j], _var[j] > ("output_" & (printf "%.4i", runnumber) & ".out"); 

Thank you.

[maziar kermani]

I have found the solution: using sprintf:

printf {j in 1.._nvars} "%s= %.3f\n", _varname[j], _var[j] > ("output_" & sprintf("%.4i", runnumber) & ".out"); 

[Victor Zverovich]

You should use sprintf instead of printf in

  sprintf "%.4i", runnumber

because the latter prints to a file rather than returns a formatted string.

HTH,

Victor

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