Convert a 4D segmented matrix to a 3D one?

Question

Mohammad Saleh 2019-9-22

回答： Athul Prakash 2019-9-25

I have a 4D segmented matrix of ones and zeros with the size 4 512 512 150. how do i convert this to a 3D matrix of size 512 512 150?

Converted matrix has less elements than original one. How do you want to remove these extra elements? I think an example would help.

Answer 1

Athul Prakash 2019-9-25

Hey Mohammad,

Going by those input and output dimensions, I am assuming that you want to extract a part of the matrix with a given value in dimension 1.

If you want to get ith value from dimension 1, use:

crop = mat(i,:,:,:);

to get 'crop' of size [1 512 512 150].

Then use the squeeze function to remove all dimensions of size 1.

crop = squeeze(crop); %this makes size = [512 512 150]

Have a look at the doc for squeeze

Cheers!