To find the value in a vector for the corresponding indices from another vector

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Savan Rangegowda
Savan Rangegowda 2017-6-20
回答： Gopichandh Danala 2017-6-20
Hi Everyone,
I have small issue in finding the values from a vector for the corresponding indices from another vector. for ex:
If I have a vector:
aa = [0.023 0.987 0.112 0.666 0.2734, .... , 0.6667]; % say dimension of 1x1000
and
bb = [34 12 67 87 76 83 11 97 23 112 298]; % say dimension of 1x50 (which are the index values for which I want the corrsponding values from aa.
I don't want to use a for loop!!
I did something wrong like
cc = aa(bb(1:end));
error message: Index exceeds matrix dimensions. %(because it does not make sense)
Can anyone suggest me any solution! It would of great help.
Thanks in advance!
Cheers, Savan

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回答（2 个）

the cyclist
the cyclist 2017-6-20
编辑：the cyclist 2017-6-20
Your largest value of bb must be longer than the length of aa.
You can check this by comparing
max(bb)
with
length(aa)
Gopichandh Danala
Gopichandh Danala 2017-6-20
There is nothing wrong in your code, maybe some of the indices in bb are higher than length of aa, which is giving that error.
Just verify
logical(max(bb) < length(aa))
if its true (1), there is no problem , if its false (0) some index in bb is higher than length of aa and causing the error

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