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how to find a certain coordinate value in a curve

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Adrian Ulza
Adrian Ulza 2017-4-7
回答： Star Strider 2017-4-7
Hi everyone, i need help.
Suppose i have a curve data as i attached. How do i find a B value that correspond to certain A value from that curve?
%%IMPORT OUTPUT FILE INTO MATLAB
load 'data.txt'
X=data(:,1);
Y=data(:,2);
A=max(X);
B=??
thanks for your help!

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回答（1 个）

Star Strider
Star Strider 2017-4-7
Ask the max function for two outputs. The second is the index of the first occurrence of the maximum in your vector, and use the index to define the corresponding value of ‘y’:
[A,idx] = max(X);
B = y(idx);

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