mean calculation by comparison
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Thishan Dharshana Karandana Gamalathge
2015년 4월 25일
댓글: Mohammad Abouali
2015년 4월 25일
Hi, In the following vectors, I need to get the "mean" of y values for each set of similar x values. What I mean is I need the avg of Y for each group of x. I also need to save those mean Y values.
x=[3 3 3 4 4 5 5 5 5 3 11]; y=[1 2 4 5 7 1 1 8 10 10 1];
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Star Strider
2015년 4월 25일
편집: Star Strider
2015년 4월 25일
This looks like an application for accumarray:
x=[3 3 3 4 4 5 5 5 5 3 11];
y=[1 2 4 5 7 1 1 8 10 10 1];
y_means = accumarray(x', y, [], @mean);
EDIT:
To get a summary of the x-values (first column) and the corresponding y_means values (second column:
xu = unique(x);
ys_means = [xu' y_means(xu)]
produces:
ys_means =
3 4.25
4 6
5 5
11 1
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Star Strider
2015년 4월 25일
I may not fully understand exactly what you want.
There is an Answer to your other, somewhat revised and updated version of this Question, that appears to be more efficient than my revised code, but it is not obvious to me how he would also supply the corresponding indices. Before delving into this myself, I’ll see what he comes up with.
Meanwhile, I will think about this and consider an entirely new effort and a new approach in light of your new requirements.
I do appreciate your already having Accepted my Answer.
Mohammad Abouali
2015년 4월 25일
Well, updated the answer, to include both start and end index of the block, as well as x-new.
As star strider mentioned, my answer on the other post is solving the same problem but using a different approach.
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