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Finding when spline interpolated data is equal to a number

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Nathan Mu
Nathan Mu 2022-4-12
编辑： Stephen23 2022-4-12
Hello, how would you determine when spline interpolated data is equal to some number, e.g. 3?
Thanks!

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Stephen23
Stephen23 2022-4-12
编辑：Stephen23 2022-4-12
Ran in:
X = [1,2,3];
Y = [1,2,4];
Yq = 3;
pp = spline(X,Y);
fh = @(xq)ppval(pp,xq)-Yq;
Xq = fzero(fh,[1,4])
Xq = 2.5616
plot(X,Y,'+',Xq,Yq,'*')

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