CODEWITHSUNDEEP
matlabindexingsubset
ZZZ
ZZZ

Reputation: 724

matlab array subsetting by indices

Let's say I have a 3x3x3 Matlab array with members 1 to 27

a=reshape(1:27, [3 3 3])

I would like to create a subset of this with a syntax like

b=a(range1,range2,range3)

where for range1=range2=range3=1:2 I would get the members b(1,1,1) and b(2,2,2). i.e

b= [1 14]

Is it possible to do this just with indexing and without any functions (e.g. diag)? Thanks...

Upvotes: 0

Views: 1370

Answers (2)

Molly
Molly

Reputation: 13610

The indexing can be done using sub2ind, 

a(sub2ind(size(a),[1:2],[1:2],[1:2]))

if you want to avoid all functions, you could calculated the linear indices yourself...

Upvotes: 1

Autonomous
Autonomous

Reputation: 9075

It can be done with sub2ind function as follows:

b=a(sub2ind(size(a),range1,range2,range3))

ans: b=[1 14]

Upvotes: 1

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