how to Create a mat file for images

i have 15 images say x1=[1 2

                     3 4 ]
similarly x2 =[5 6
              3 4 ] , x3 till x15

first i want these to be converted to x1= [ 1

                                  2         

                                  3      

                                  4]            
similarly other matrixes also.

i want to save a mat file called

dark = [ 1 6

       2       7

       3      3   

       4       4]

Answer 1

[Image Analyst]

A mat file called what?

Anyway, to save those variables:

save(matFileName, 'x1', 'x2, 'x3', 'x4', ...
'x5', 'x6', 'x7', 'x8', ...
'x9', 'x10', 'x11', 'x12', ...
'x13', 'x14', 'x15', 'dark');

[Sharen H]

can we save like for i=1:20

save (matfilename,'x(i)');

end

[Image Analyst]

No, because you unwisely chose to have numerous unique, independently-named variables instead of using a 2D matrix like everyone else probably would have. Anyway, you'd need to either change the filename on every iteration or else use the -append option of save().

[Sharen H]

my data is i have 15 images of size mxn which has to be converted to 1 x m*n matrix .

then i have to save these in the form of mat file having 15 x m*n matrix. can u

help me to do this in way where i have to call and save using loop because my data

 gets increases as it goes on. thanks in advance

[Image Analyst]

Try this:

x1 = x1(:); % Convert to 1-D
x2 = x2(:); % Convert to 1-D
... etc.
x15 = x15(:); % Convert to 1-D
dark = dark(:); % Convert to 1-D
% Now save them all into a single mat file.
save(matFileName, 'x1', 'x2, 'x3', 'x4', ...
'x5', 'x6', 'x7', 'x8', ...
'x9', 'x10', 'x11', 'x12', ...
'x13', 'x14', 'x15', 'dark');