creating Arrys from another big array

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Rica
Rica on 7 Jul 2015
Answered: Guillaume on 7 Jul 2015
Hi, I have an array A of the size 1X1000. and i have a vector of Index: index=[1 25 40 63 77 99 100]
is there any easy way in matlab to create such arrays:
Arr1=(A(index(1)): A(index(2)))
Arr2=(A(index(2)): A(index(3)))
Arr3=(A(index(3)): A(index(4)))
and so on...
  2 Comments
Rica
Rica on 7 Jul 2015
sorry i mad a mistake:this is the corrected question: Hi, I have an array A of the size 1X100 . and i have a vector of Index: index=[1 25 40 63 77 99 100]
is there any easy way in matlab to create such arrays:
Arr1=(A(index(1)): A(index(2)))
Arr2=(A(index(2)): A(index(3)))
Arr3=(A(index(3)): A(index(4)))
and so on...

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Accepted Answer

Thorsten
Thorsten on 7 Jul 2015
Edited: Thorsten on 7 Jul 2015
index=[1 25 40 63 77 99 100]
A = rand(1,100);
for i = 1:numel(index)-1
B{i} = A(index(i):index(i+1));
end
Note that the index(2), index(3), ... index(N-1) elements occur twice in B, such that B has numel(index) -2 elements more than A.

More Answers (1)

Guillaume
Guillaume on 7 Jul 2015
Another option to Thorsten's answer:
indices = [1 25 40 63 77 99 100];
A = rand(1, 100);
B = arrayfun(@(s,e) A(s:e), indices(1:end-1), indices(2:end), 'UniformOutput', false);
Note that it while it is possible to create variable names on the fly as in your example. It's a very bad idea. Using a cell array as in our answers is much better.

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