corresponding legends for each curves in one plot

Hi !

I'm trying to plot 8 matrixes (C1 to C8) on 1 plot. For each ploted matrix, I want the corresponding legend (C1 to C8). Below is my code and when I run it, MATLAB returns me :

"Function 'subsindex' is not defined for values of class 'cell'.

Error in matlab_common_plot (line 16) legend(Legend)"

numberfile = 8
figure
title('Spannung vs. Traversenweg - - C')
for i=1:numberfile
mat_x=eval(['C',num2str(i)]);  
plot(mat_x(:,2),mat_x(:,6),'-')
hold all
end
hold off
xlabel('Traversenweg (mm)')
ylabel('Spannung (MPa)')
Legend = cellstr( num2str((1:numberfile)','C%d') );
legend(Legend)
saveas(gca, 'Spannung vs. Traversenweg - -C.jpg', 'jpg');
close
end

Answer 1

[Thorsten]

I generate some fake data with

for i=1:numberfile, eval(['C' int2str(i) '=rand(10,10);']), end

and the code works fine for me. Can you run this without error?

Maybe you have by accidentally defined legend as a variable. You can check this using

which legend

Should return something like

/Applications/MATLAB_R2012a.app/toolbox/matlab/scribe/legend.m

Note that using variables of that differ only in a single upper-case letter from a Matlab function, like your "Legend" is not a good idea. Use something else, like legendstr.

Answer 2

[Romain Marchant]

Yes, it runs without errors.

which legend

returns "legend is a variable.". How can I change this?

[Thorsten]

 clear legend

And check that you have not used legend as a variable anywhere in your program. But if you have so, rename it.

And please use the comment function instead of posting your comments as a new answer.

[Romain Marchant]

Of course, that was a silly question ...

Oops, sorry. First time on that forum.

I've got another question : For now, I can import -=C1.txt to -=C8.txt file one after another into matrixes C1 to C8. (example below with matrix C8) What I want to do is making a for loop to import those 8 datas in 1 run. To do so, I need to change those numbers "/Users/.../-=C 8.txt" and "C 8 = cell2mat(raw);" for each increment (from 1 to 8). I tried sprint(), str2num() and many others without finding any solutions. PS: that code has been generated by the Import Wizard in Matlab.

filename = '/Users/.../-=C8.txt';
delimiter = '\t';
startRow = 3;

formatSpec = '%s%s%s%s%s%s%[^\n\r]';

fileID = fopen(filename,'r');

dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'HeaderLines' ,startRow-1, 'ReturnOnError', false);

fclose(fileID);

%turn point into comma ... blablabla

C8 = cell2mat(raw);

clearvars filename delimiter startRow formatSpec fileID dataArray ans raw col numericData rawData row regexstr result numbers invalidThousandsSeparator thousandsRegExp me R;

[Thorsten]

Romain, please formally accept my answer and then open a new question to ask a new question.

[Romain Marchant]

Thank you very much for your answer. I'll open a new question.