How to save separate '.mat' files with the image name including it ?

I am creating the data base for the Microscopic cell 400 images that extracts the alive and dead cells by calling gerect func. I need to save the result in the .mat files starting with image name.I am using 'try' and 'catch' to generate the database. my code as follows:

[fname path]=uigetfile('.jpg','open a cell pic');
fname=strcat(path,fname);
a=imread(fname);
im=rgb2gray(a);
imshow(im);
title('input image');
while(1)
  rect=datapoints(im); % calling getrect function to extract  points
    %c=input('enter the label: \n');
      try 
        load data
        trainSets=[rect c];
        data=[data; trainSets];
      save data.mat data;
               catch
        data=[rect c];
              save data.mat data
    end

this program creating only one .mat File name named as 'data.mat' , but i need .mat for each image i open.as image1.mat, then image2.mat and so on Plz help !!!!!!

[Stephen23]

You need use the function version of save, rather than the command form, and create a new filename each time you call the function. I would recommend that you use fullfile to create the full filename.

https://www.mathworks.com/help/matlab/matlab_prog/command-vs-function-syntax.html

Answer 1

[Jan]

 I am using 'try' and 'catch' to generate the database.

Although this works, it is cleaner to check for the existence of the file:

if exist('data.mat', 'file')
  FileData  = load('data.mat');
  trainSets = [FileData.rect, FileData.c];
  data      = [data; trainSets];
else
  data = [rect c];
  save('data.mat', 'data');
end

If you want to modify the file name, see: FAQ: Process a sequence of files.

Folder = cd;
for k = 1:10
  File     = fullfile(Folder, sprintf('image%d.mat', k))
  FileData = load(File);
  ...
end

The same works for

save(File, 'data')

[Husnain Rashid]

Thanks for the answer, but i am not getting your point. where to put these code lines in my code? Please help

if exist('data.mat', 'file')
  FileData  = load('data.mat');
  trainSets = [FileData.rect, FileData.c];
  data      = [data; trainSets];
else
  data = [rect c];
  save('data.mat', 'data');
end

[Jan]

TRY/CATCH is useful to catch errors, but it is more elegant to avoid errors instead. Instead of:

try 
  load data
  ...
catch
  data = ...
end

you can check the existence of the file at first. If the file is missing, you can create the data without letting Matlab fail in load(). Remember that "load data" imports "data.mat" if it stored anywhere in the Matlab path or in the current folder.

[Husnain Rashid]

much appreciated .thankyou