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How to find corresponding value in two arrays?
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Hi,
I have to data arrays, A and B. I want to knwo how it is possible to find corresponding number or value of the element in B array when accumulation in A array reaches certain value? Basically, I want to elements in array A until the sum reaches prescribed value. Then I need to know what was the corresponding value in B array when the condition is met. How can I do this? Cannot find a way my own...
Thanks
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Chad Greene
2014-10-22
编辑:Chad Greene
2014-10-22
A = rand(1,100);
B = rand(1,100);
MyBElements = B(cumsum(A)<10)
Above, MyBElements is all the elements in B until the cumulative sum of A reaches 10.
Plotting the cumulative sum of A, a threshold at 10, and the individual elements of A, B, and MyBElements can be done like this:
figure;
subplot(2,1,1)
plot(cumsum(A));
hold on
plot([1 100],[10 10],'r')
axis tight
title('cumulative sum of A')
subplot(2,1,2)
plot(1:100,A,'b+',1:100,B,'rx')
hold on
box off
plot(MyBElements,'ro')
legend('A','B','MyB')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/176265/image.png)
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