MATLAB: 3-D matrix operations

3dfor loopmatrix

I have a 5X126 matrix that I am splitting into a [5,21,6] matrix using reshape. I want to average the values of neighboring columns in each of these submatrices and store them into a final 3-d matrix that will be [5 20 6]. How can i write a for loop to do this?

I am very new to Matlab so any help would be appreciated. Thanks!

Best Answer

Assuming that for the average of columns you want the result that Turlough specified, then

RefBloAvg = movmean(RefBlock,[0 1],2);
RefBloAvg(:,end,:) = [];

Note that this does not need to be in a loop of any kind. It works on the entire array at once.

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MATLAB: Suppose I have a matrix of size(3,3).This is up-scaled by 2 making it (6,6).So there would be a number of vacant values between each element of the initial (3,3) matrix.Then how do you fill up the 0 values in addmatrixR by bicubic/liner interpolati

Just use interp2:

>> M = magic(3)
M =
   8   1   6
   3   5   7
   4   9   2
>> interp2(M,1)
ans =
   8.0000   4.5000   1.0000   3.5000   6.0000
   5.5000   4.2500   3.0000   4.7500   6.5000
   3.0000   4.0000   5.0000   6.0000   7.0000
   3.5000   5.2500   7.0000   5.7500   4.5000
   4.0000   6.5000   9.0000   5.5000   2.0000

Or the simplest of all:

>> interp2(M)
ans =
   8.0000   4.5000   1.0000   3.5000   6.0000
   5.5000   4.2500   3.0000   4.7500   6.5000
   3.0000   4.0000   5.0000   6.0000   7.0000
   3.5000   5.2500   7.0000   5.7500   4.5000
   4.0000   6.5000   9.0000   5.5000   2.0000

If you need to specify the sample points, then do something like this:

>> [Xi,Yi] = meshgrid(1:1.0:S(2),1:1.0:S(1));
>> [Xo,Yo] = meshgrid(1:0.5:S(2),1:0.5:S(1));
>> out = interp2(Xi,Yi, M, Xo,Yo)
out =
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   5.5000   4.2500   3.0000   4.7500   6.5000
   3.0000   4.0000   5.0000   6.0000   7.0000
   3.5000   5.2500   7.0000   5.7500   4.5000
   4.0000   6.5000   9.0000   5.5000   2.0000

Best Answer

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