Remove slices of 3D matrix

Question

Erfaneh 2014-9-6

1
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评论： Erfaneh 2014-9-6

I have a binary 3D matrix with 400 slices. I want to remove the slices (0 to 100) and (300 to 400) and I just want to keep the slices (100 to 300). I used from following code for removing 100 first slices:

for i=1:100
A(:,:,i)=[];
end

But above syntax code didn't remove 100 first slices, it removed 100 slices but not from the first. Can any one tell me where is the problem?

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Answer 1

Roger Stafford 2014-9-6

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编辑：Roger Stafford 2014-9-6

在 MATLAB Online 中打开

That is because after removing the first "slice", slice number 2 becomes number 1 and when you attempt to remove slice 2 it is actually the original slice 3 that is taken out. In other words in terms of original slice numbers you are removing the first 100 odd-numbered slices, 1,3,5,7,.... Also the slice numbers you quote are inconsistent - there are 101 slices in 0 to 100 and 300 to 400 and you would have 201 left in 100 to 300. Also there is no slice 0 in terms of index numbers.

I'll assume you want to remove the first and last 100 leaving the middle 200. Do this:

A(:,:,[1:100,301:400]) = [];