Extracting values from an array which correspond to values from another array

Hi

I have three equal-length arrays: x, y and c.

c ranges from 0 - 415, x from 0 - 1 and y from 0 - 1500.

I want to select the data from c which have values <50, and then select the corresponding data from the other two arrays.

I can find the required values for c, but cannot find how to select the data from the other arrays.

Any help would be appreciated!

Josh

Answer 1

[Stephen23]

Read these:

https://www.mathworks.com/help/matlab/math/matrix-indexing.html

http://blogs.mathworks.com/steve/2008/01/28/logical-indexing/

And then check this out:

>> A = randi(9,1,9)
A =
   4   7   7   4   5   4   7   3   1
>> B = rand(1,9)
B =
   0.610330   0.959444   0.900687   0.967633   0.010723   0.783159   0.016694   0.609336   0.980585
>> idx = A<5;
>> A(idx)
ans =
   4   4   4   3   1
>> B(idx)
ans =
   0.61033   0.96763   0.78316   0.60934   0.98059

[Joshua Chambers]

Thank you!!!