error using the example script of PCA

 data=imread('result.png');
>> [M,N]=size(data);
>> mn=mean(data,2);
>> data=data-repmat(mn,1,N);
??? Error using ==> minus
Integers can only be combined with integers of the same class, or
scalar doubles.

how to resolve it

Answer 1

[José-Luis]

data = imread('result.png');
data = bsxfun(@minus,data,mean(data,2));

Note that this will not solve your problem, as the mean of integers will probably yield doubles. You probably want to do something like:

 data = bsxfun(@minus,data,int8(mean(data,2)));

You can find the data type using:

 whos data

and you could then modify the application accordingly (change the int8 to the appropiate type). Please accept an answer if it helps you.

[ajith]

>> data = bsxfun(@minus,data,int8(mean(data,2)));

>> data = data-repmat(mn,1,N);

??? Error using ==> minus Integers can only be combined with integers of the same class, or scalar doubles.

how to resolve it sir

[José-Luis]

It means that mean(data) is not the same type as data. Have you tried what i suggested? What does

 whos data

return before you run the script?

Alternatively you could convert everything to double. This should work:

data = double(imread('result.png'));
data = bsxfun(@minus,data,mean(data,2));