Convert a regressive function to a matrix

[gatlas]

I have a regressive function Y[k and i need to express it as a matrix. Ultimately, I need to smooth it and make it a continuous function using either linear interpolation or splines.

Note that the regressive function is expressed using subscripts, y[k.

I'm using Mathcad Prime

[Werner_E]

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Note that the regressive function is expressed using subscripts, y[k.

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Then its not a function but rather a vector of values!?

Its not clear to me what you are looking for.

How about posting a example worksheet?

[gatlas]

Werner,

I'm trying to convert a regressive function y[k to a smoothe function that can be readily differentiated.

Please see the attachment.

Thanks,

Glen

[LucMeekes · Accepted solution]

Like this:

Success!
Luc

[gatlas]

This works! Thanks!

[terryhendicott]

Hi perhaps answer can be found on these help locations:

Regression

Interpolation and Prediction Functions

Beyond this you may need to expand the question

[Werner_E]

Because your recursively defined series follows a linear recursion, we can always find the direct general formula for computing the nth term as a function of n,
So there is no need for interpolation or approximation via a regression.

Don't let the imaginary unit confuse you, the returned function values are real 😉

[gatlas]

Thanks!