Spline coefficients for data point

2019 10 15
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更新时间：2019 10 21
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Dear colleagues,
how can I get the spline coefficients for a certain data point?
I know that I can get all the coefficients by using the point-operator (as "pp.coefs"). But how can I get the coefficients for a specific data point (x value). Is there an automatic expression?
Best regards,
Felix

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Prabhan Purwar
Prabhan Purwar 2019-10-18

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Hello,
Spline definesa polynomial among the breakpoints in the curve. To define the coefficient at a particular ‘x value’ there is a need to define an interval among enclosed breakpoints and make use of pp.coefs() as suggested.
Refer to the following link for further information:

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felix.b
felix.b 2019-10-21
Thank you, Prabhan!
That's exactly what I did. If someone encounters the same problem, please see the code below.
C = pp.coefs;
b = (pp.breaks)';
j=0;
for k=1:length(C)
if (((xi >= b(k)) && (xi <= b(k+1))) && (j==0))
j=k;
break
end
end
xS1 = b(j);

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