What are the parameters of spmak({s,t},a)?

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Hello,
i want to use the "spmak" function to construct a bivariate tensor product spline. I found this example, where the "spmak" function is used to construct a tensor product spline. In the example the parameters of the "spmak" function are discribed very short. It says that "{s,t}" is the "cell array of its knot sequences". What does this mean? Is this the array containing my x,y input data or the knots? And if the array is containing the knots, how do i choose them? Furthermore "a" is specified as "coefficient array". Is this the array where later my coefficients are saved? During the example there are also named the "numbers vector" and the "orders vector" but they are not used in the command "spmak({s,t},a)". Can anyone help me to understand the meaning of these parameters and how i have to set them? Thank you!
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Lukas Sohlbach
Lukas Sohlbach 2018-8-30
Not really, because there is the "spmak" function used with different input parameters.

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