How does a tensor product spline equation in MatLab code look like?
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Lukas Sohlbach
il 20 Ago 2018
Commentato: Sachin Meena
il 31 Ago 2018
Hello,
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/194059/image.jpeg)
into MatLab code, or provide me a comparable equation in MatLab code? I want to use this equation later on as "custom equation" in the "curve fitting tool". Thank you!
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Sachin Meena
il 30 Ago 2018
Hi Lukas. If I understand your problem correctly, I believe the documentation link that you have provided contains your answer. In the section "B-form of Tensor Product Splines", the command given
Sp = spmat({s,t},a);
does what you are asking for. Here, the number vectors [m,n] are acquired from the size of "a", the coefficient matrix provided. With size of "s" and "t" known and the number vectors acquired, it also gets the orders vector [h,k].
So the equation is now in variable Sp.
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Sachin Meena
il 31 Ago 2018
Hey Lukas, it turns out that your use case is not yet supported by the cftool. The issue with using
spmat({s,t},a)
is that it does not explicitly uses "x" and "y", while the issue with using
spapi({s,t},[h,k],{x,y},z)
is that the dependent variable "z" cannot occur on both sides of the equation.
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