Problem with Octave and GnuPlot

[Ian Journeaux]

I am not sure where exactly this problem lies and since it is not 100% reproducible, I am unsure how to troubleshoot. My main program processes a bunch of samples in series. Each sample involves loading Octave, running an octave script which processes several images and exiting Octave.

 

Most of the time this works.

 

The script reads and image, performs some analysis, plots the data using gnuplot, saves the plot to disk, save some data as tex files and dumps the results into Excel via Oct2XLS.

 

Unfortuantely the script often stops dead in its tracks after the gnuplot figure is created and saved and before a text file is created with the results,  Sometimes the gnuplot window is left up othertimes the GNU plot window is closed. Octave doesn’t crash it is just unresponsive.

 

I had read of possible incompatibilties between Octave 3.2.4 and the oct2mat package so I set Oct2mat to not load automatically. That did not change the result. Interestingly, if I have 20 images to be analyzed, the image Octave hangs on changes from one time to the next. Sometimes it fails on the 1^st image.

 

 

I realize a code snippet isn’t to valuable but since I can reliably make the problem occur, it probably doesn’t matter.  In the code below, Octave becomes unresponsive after the file missdots.jpg is created  and before the helioprofile.tex file is opened. The graphic that is being created is pretty simple.

 

Appreciate any thoughts.

 

 

% Plotting graphs

                        dista(1:20)=dist(NbrImageAnalyzed)/10;

 

%                     multiplot(1,2);

                        count=[0 count];

                        counti=[0 counti];

                        figure(1); subplot(2,1,1);

                        plot(0:11,count');

                        xlabel('Distance from origin (cm)');

                        ylabel('Missing dots');

                        title('Missing dots per cm');

                        axis ([0 10]);

                        xl=floor(dist(NbrImageAnalyzed));

                        xxl=(1:xl)/10;

                        yyl(1:xl)=20;

                        subplot(2,1,2);

                        if NUM<500;

                        plot(0:11,counti,dista,1:20,"r",xxl,yyl,"r");

                        else

                        plot(0:11,counti');

                        endif;

                        axis ([0 10]);

                        xlabel('Distance from origin (cm)');

                        ylabel('Cumulated missing dots');

                        title('Missing dots per cm (cumulated)');             

                       

%                     text(-0.3,20,'20');

                       

                        T1=strcat(Ta,'missdots.jpg');

                       

                        print((1),T1,'-djpg');

                       

                        close all

           

                        count(1)=[];

                        counti(1)=[];

                       

                                   

                        TT=strcat(Ta,'Helioprofile.tex');

%                     TT=strcat('Helioprofile.tex');

                        file=fopen(TT,'w');

                        aa=1:11;

                        result=[aa' count' counti'];         

                        fprintf(file,'%d & %d & %d \\\\ \n',result');

                        fclose(file);