Remove .mat variable image data

 whos('-file','data_batch_1.mat')

Name                 Size                 Bytes      Class    Attributes

batch_label          1x21                    42          char               
data              10000x3072            30720000    uint8              
labels            10000x1                  10000         uint8

When I analyze my .mat file It has three variable. In the data variable. I want to remove the image inside the data variable and keep my won 10000 image data in same Size, same Bytes and same Class. Anyone can help me providing Matlab code.

[KSSV]

Not clear with question.....in .mat file there are three variables, you need to delete few variables out of it?

[Md Shamim Hossain]

In Data variable contains 10,000 images. I want to remove all images inside Data variable and keep my won 10,000 images in same size 10000x3072 and same class uint8.

Answer 1

[Walter Roberson]

filename = 'data_batch_1.mat';
filestruct = load(filename);
filestruct.data(:) = 0;    %removes all useful content, preserving size and data class
save(filename, 'filestruct', '-struct');    %write the variables back to the file