Saving images with a name that change with the distance

Hello !

I'm working on a diffraction simulation, and I plot figures of the diffraction pattern along the z axis with a vector called d that starts at 1cm, then 5cm, 10cm, etc.

I already did a command to give a title on figures that depends of d(i) with "num2str(d(i))", but I tried with the saveas command like this :

path = 'C:\this\is\not\a\real\path';
  saveas(gca, fullfile(path,['double_fente_larg5ecart20_d',num2str(d(i)),'cm_l1mm']), 'jpeg');

But it does not work and give a .0.01cm_l1mm extension name to the saved files...

How could I solve my problem ?

Thanks for the help, and sorry for my english (i'm french)

Answer 1

[Deepak]

Hi @Pilou,

We can achieve correct file naming in a diffraction simulation by using "sprintf" to format d(i) with the desired precision, ensuring filenames reflect the intended measurement without extra decimals. By constructing the path with "fullfile" and saving with "saveas", we generate precise filenames that accurately correspond to the simulation values, avoiding formatting issues.

Below is the MATLAB code to achieve the same:

path = 'C:\this\is\not\a\real\path';

% Use sprintf to format the number with no decimal places or specify the desired precision
filename = sprintf('double_fente_larg5ecart20_d%.0fcm_l1mm', d(i)); % Adjust %.0f to the desired precision

% Use fullfile to construct the full path
fullFilePath = fullfile(path, filename);

% Save the figure
saveas(gca, fullFilePath, 'jpeg');

Please find attached the documentation of functions used for reference:

sprintf: www.mathworks.com/help/matlab/ref/string.sprintf.html

fullfile: www.mathworks.com/help/matlab/ref/fullfile.html

saveas: www.mathworks.com/help/matlab/ref/saveas.html

I hope this helps in resolving the issue.

[Walter Roberson]

I would suggest

filename = sprintf('double_fente_larg5ecart20_d%02dcm_l1mm', round(d(i)*100));

maybe even %03d if the distances can reach 100cm