To obtain the average 'B' value by using Theta value according to each R value in the 3960x4 Matrix

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Berat Can Karatas
Berat Can Karatas 2020-7-21
编辑： Berat Can Karatas 2020-7-22
Dear colleagues,
I am trying to calculate a B value. I have a 3960x4 matrix. In this matrix, R value is the first column, Theta value is the second column and Bz value is the fourth column. (No need for the third column.)
My purpose is to find the average of the B values in all Theta values for each R value. I will draw the graph (43x2) of B according to the R values.
Example:
For R=2,
B(Theta_0(R=2)) + B(Theta_1(R=2)) + B(Theta_2(R=2)) + ... + B(Theta_89(R=2))= Avg(B(R=2))
Many thanks

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Berat Can Karatas
Berat Can Karatas 2020-7-22
编辑：Berat Can Karatas 2020-7-22
I found solution by myself.
Here is the code without loop.
X=readtable('rt_v1.txt');
R(:,1)=X{:,1}/100;%radius (m)
R(:,2)=X{:,4}*0.0001; %magnetic field (Tesla)
A=sortrows(R,1); %sorting according to R value
[r,c] = size(A);
nlay = 42; % layer size
Avg = transpose(squeeze(mean(permute(reshape(A',[c,r/nlay,nlay]),[2,1,3]),1)))

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