Finding corresponding interpolated x values for defined y values

Question

Susan 2011-11-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/20239-finding-corresponding-interpolated-x-values-for-defined-y-values

Hi all,

I have obtained data and plotted it. I then interpolated it via spline interpolation and everything works fine. However, I would like to obtain precise values for the t2 (i.e. the interpolated x values) coordinates at say 10%, 20%, 30% etc., of the maximum y2 (i.e. interpolated y values) value.

The answer I obtain is

ans =
     Empty matrix: 1-by-0

Please see the code below. I hope you can help.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
x = KE_data(:,1);   
y = KE_data(:,2);   
t2 = -20.5005:0.00002457:-20.2548; 
y2=interp1(x,y,t2);
max_y2 = 0.1*max(y2);
t2((y2==max_y2))