using find function and stor the filtered data in a Matrix

Question

Tharindu 2023-2-22

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评论： Tharindu 2023-2-24

Hello,

I have two columns of data. frequency and H. Now I want to find H values, which the respective frequency values belongs to predefined classess and stor them in a matrix. per say, f = (1.3; 1.4; 2.1; 2.5; 2.7; 2.8; 3.4) and H = (5;6;7;3;2;4;9). Now I want to find which H values falls in frequency classes of (1-2), (2-3), (3-4) and store them in a matrix (may be row sizes are unequal, make it equal size with rest of the elements being set to zeros). Since I have so many classes, I am hoping to do so using a for loop and find function. (expected answer is something like below with columns are representing frequency classes of (1-2), (2-3), (3-4) in order.

[5 7 9

6 3 0

0 2 0

0 4 0]

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Answer 1

Dyuman Joshi 2023-2-23

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编辑：Dyuman Joshi 2023-2-24

在 MATLAB Online 中打开

Assuming the ranges are [1,2), [2,3) ...

f = [1.3; 1.4; 2.1; 2.5; 2.7; 2.8; 3.4];
H = [5;6;7;3;2;4;9];
arr = floor(f);
[~,m]=mode(arr);
%pre-allocation
out = zeros(m,max(arr));
%generalised approach instead of 1:max(arr)
for k = unique(arr)'
    z = arr==k;
    out(1:nnz(z),k)=H(z);
end
out
out = 4×3
     5     7     9
     6     3     0
     0     2     0
     0     4     0