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Select values in the matrix based on the condition

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Turbulence Analysis
评论： Steven Lord 2022-6-29
Hi,
I have two matrix A and B of 94349 x 1.
Here the values in the matrix A are range from 0 to 1. First, I have to identify row numbers in the matrix A that got values only in the range of 0.05 to 0.06. Then I have to read values from matrix B that pertains to only the preselected rows from step 1.

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NIVEDITA MAJEE
NIVEDITA MAJEE 2022-6-29
编辑：NIVEDITA MAJEE 2022-6-29
Hi,
You could do the following:
filtered_idx = find((A>=0.05 & A<=0.06)) %this will store the indexes from the matrix A which have values between 0.05 and 0.06
filtered_B = B(filtered_idx) %this will store the values corresponding to the indexes stored in filtered_idx
Hope this helps!
  1 个评论
Steven Lord
Steven Lord 2022-6-29
Ran in:
You don't care where the items in the desired range are located, all you care is that you can select them. So you don't need find.
x = 1:10;
logicalMask = (4 <= x) & (x <= 7)
logicalMask = 1×10 logical array
0 0 0 1 1 1 1 0 0 0
linearIndices = find(logicalMask)
linearIndices = 1×4
4 5 6 7
You can use either the logical mask or the linear indices to obtain the values from x. But you can see that calling find is a second step beyond generating the logical mask, so if you don't actually need the linear indices why compute them?
x(logicalMask)
ans = 1×4
4 5 6 7
x(linearIndices)
ans = 1×4
4 5 6 7

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