how to use "save" command in matlab as an indexable command

how to use 'save' command in matlab as an indexable command matlab indexing save wavelet There is a matrix of 2550*720 dimension. Each row of this matrix is changed to an image by wavelet transform. The problem is that 'save' command in matlab, store all of 2550 images together in one image.The question is how to indexing 'save' command to store these images separately? Thank you

[Sriram Tadavarty]

Ramin,

Can you post the code that you tried? So that it makes simple to suggest the modifications.

[Ramin]

if true
  % code
endsure. this is my code: 

    clc;
    clear;
    close all;
    load P300
    load nP300
    t = 1:100;
    waveletname = 'db1';
    P300_cwavelet=[];
    ext = '.txt';
    for i = 1 : size(P300,1)  
      y = cwt(P300(i,:),t,waveletname);
      P300_cwavelet = [P300_cwavelet;y];
      save('P300_cwavelet','P300_cwavelet');
    end

Answer 1

[Sriram Tadavarty]

Hi Ramin,

You can use a different mat file name to save each wavelet. Since, this was placed in for loop, it is always storing the last one.

Try the modification as below:

clc; clear; close all; 
load P300 
load nP300 
t = 1:100; 
waveletname = 'db1'; 
P300_cwavelet=[]; 
ext = '.txt'; 
for i = 1 : size(P300,1) 
    y = cwt(P300(i,:),t,waveletname); 
    P300_cwavelet = [P300_cwavelet;y]; 
    save(['P300_cwavelet ' num2str(i)],'P300_cwavelet'); % Name as loop index attached
end

Hope this helps.

Regards,

Sriram

[Ramin]

thanks a million. yes it worked

Answer 2

[Walter Roberson]

You cannot do that. save() always saves the entire variable named, so you will have to put them into seperate variables. The one exception to that, is using the -struct option: if you have a scalar struct and use the -struct option then instead of it saving the entire struct as one variable, it will create one variable for each field name in the struct.

You should also look at matFile, which is able to read parts of an array from a .mat file.