#4183 plotting error: "can't open file"

[Frans van den Nobelen]

when executing wxplot2d(4*x^2-8*x+2,[x,-1,2],[y,-5,5]);
I get error: can't open file '/var/folders/nc/n7pvwk2n1h9fwgmsfkw5jwt40000gn/T/maxout_4758_8.png' (error 2: No such file or directory)

System info
wxWidgets: 3.1.2
Unicode Support: yes
Maxima version: 5.43.0 (x86_64-apple-darwin13.4.0)
Lisp: SBCL 1.5.3

[Gunter Königsmann]

does plot3d (without the wx) work?

[Frans van den Nobelen]

no it doesn't, but now gives another error:

plot2d(4x^2-8x+2, [x,-1,5]);

Maxima encountered a Lisp error:
Couldn't execute "gnuplot": No such file or directory
Automatically continuing.
To enable the Lisp debugger set debugger-hook to nil.

Op ma 11 sep 2023 om 21:55 schreef "Gunter Königsmann" peterpall@users.sourceforge.net:

does plot3d (without the wx) work?

[bugs:#4183] https://sourceforge.net/p/maxima/bugs/4183/ error: can't
open file

Status: open
Group: None
Created: Mon Sep 11, 2023 05:26 PM UTC by Frans van den Nobelen
Last Updated: Mon Sep 11, 2023 05:26 PM UTC
Owner: nobody
Attachments:

• Screenshot 2023-09-11 at 19.03.25.png
  https://sourceforge.net/p/maxima/bugs/4183/attachment/Screenshot%202023-09-11%20at%2019.03.25.png
  (308.9 kB; image/png)

when executing "wxplot2d(4x^2-8x+2,[x,-1,2],[y,-5,5]);"
I get error: can't open file
'/var/folders/nc/n7pvwk2n1h9fwgmsfkw5jwt40000gn/T/maxout_4758_8.png' (error
2: No such file or directory)

System info
wxWidgets: 3.1.2
Unicode Support: yes
Maxima version: 5.43.0 (x86_64-apple-darwin13.4.0)
Lisp: SBCL 1.5.3

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[Tomio Arisaka]

I guess your Maxima fails to search $PATH for gnuplot.
So I think you should let Maxima know the path to gnuplot.
For example:

(%i1) system ("which gnuplot") $
/opt/local/bin/gnuplot

(%i2) gnuplot_command ;
(%o2)                               gnuplot
(%i3) gnuplot_command : "/opt/local/bin/gnuplot" ;
(%o3)                       /opt/local/bin/gnuplot
(%i4) plot2d (4*x^2-8*x+2, [x,-1,5]) ;
(%o4)                                false

[Frans van den Nobelen]

works now, thanks!

Op di 12 sep 2023 om 09:47 schreef Tomio Arisaka tomio-arisaka@users.sourceforge.net:

I guess your Maxima fails to search $PATH for gnuplot.
So I think you should let Maxima know the path to gnuplot.
For example:

(%i1) system ("which gnuplot") $/opt/local/bin/gnuplot
(%i2) gnuplot_command ;(%o2) gnuplot(%i3) gnuplot_command : "/opt/local/bin/gnuplot" ;(%o3) /opt/local/bin/gnuplot(%i4) plot2d (4x^2-8x+2, [x,-1,5]) ;(%o4) false

---

[bugs:#4183] https://sourceforge.net/p/maxima/bugs/4183/ error: can't
open file

Status: open
Group: None
Created: Mon Sep 11, 2023 05:26 PM UTC by Frans van den Nobelen
Last Updated: Mon Sep 11, 2023 07:55 PM UTC
Owner: nobody
Attachments:

• Screenshot 2023-09-11 at 19.03.25.png
  https://sourceforge.net/p/maxima/bugs/4183/attachment/Screenshot%202023-09-11%20at%2019.03.25.png
  (308.9 kB; image/png)

when executing "wxplot2d(4x^2-8x+2,[x,-1,2],[y,-5,5]);"
I get error: can't open file
'/var/folders/nc/n7pvwk2n1h9fwgmsfkw5jwt40000gn/T/maxout_4758_8.png' (error
2: No such file or directory)

System info
wxWidgets: 3.1.2
Unicode Support: yes
Maxima version: 5.43.0 (x86_64-apple-darwin13.4.0)
Lisp: SBCL 1.5.3

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[Robert Dodier]

Closing this bug as fixed since OP reports that it works now.