How to compute calculations on each dimension of the array?

Hi, all!

The matrix D is 4096X1610 (spectra X wavenumbers). I want to subtract the average of each spectrum from D and the average of each wavenumber from corresponding wavenumber in D and put the result into a matrix. I have calculated for each dimension but I don't know how to combine results to get 4096X1610 matrix.

mean1 is mean of wavenumbers (1x1610) and mean2 is mean of spectrum (1x4096) from D.

My Code:

D4=D(4096,:)-mean1;

D5=D(:,1610)-mean2';

I want to combine what i have in D4 and D5 such that the dimensions of the output is 4096X1610 for further analysis. Any help is appreciated. Thanks!

Answer 1

[Matt J]

Well, the code you've shown won't work. I think you really mean

D4=bsxfun(@minus,D,mean1);
D5=bsxfun(@minus,D,mean2(:));

Now you say you want to combine D4 and D5 in some way? As in D4+D5 or D4.*D5 ?

As you can see, there are many possibilities. You must define the operation for us.

[Sandeep]

Thanks for the reply, Matt!

I just want to perform row and column operations to the matrix D (4096 spectra X 1610 wave numbers) simultaneously. I want to subtract mean of every wavenumber from column entries and subtract mean of every spectra from the row entries of D to get the matrix E.

[Matt J]

So how is that different from computing D4 and D5 as I've showed you? Do you mean this,

 D4=bsxfun(@minus,D,mean1);
 E=bsxfun(@minus,D4,mean2(:));

[Sandeep]

Thank you, Matt! Your code works perfectly. I was trying to do it using for loop which was a bad idea.