topic Re: Linear Interpolation from one column of a matrix in Mathcad

Linear Interpolation from one column of a matrix

Eng_ReyD_497 — Thu, 03 Jun 2021 20:01:40 GMT

Hi,

I have X & Y defined as two matrix variables, which I can do a linear interpolation between them...

How can I perform the same interpolation if I have X & Y in a combined matrix, ?

I am attaching the Mathcad file

Re: Linear Interpolation from one column of a matrix

LucMeekes — Thu, 03 Jun 2021 21:12:42 GMT

You can use the 'column operator' to select/copy a column from a matrix, keyboard shortcut [Ctrl-Shft-C].

See attached.

Success!
Luc

Re: Linear Interpolation from one column of a matrix

Eng_ReyD_497 — Fri, 04 Jun 2021 12:01:21 GMT

Thanks @LucMeekes

I wanted to perform interpolation within the matrix, not just splitting it into columns. However, I used your technique and built the next step of the actual interpolation and it works... Thanks a lot.
I just wanted to show you what I did with the interpolation itself in light of your help, which I assume is what you meant; unless you have a different approach just to learn from it ...

Thanks and all the best!

Re: Linear Interpolation from one column of a matrix

LucMeekes — Fri, 04 Jun 2021 13:17:01 GMT

You did it correctly. If you don't want to break up the matrix, this:

is the way to do what you want.

Note that I used ORIGIN in my example, and you've used it also. It is the safest way to point to the first element (or column or row) of an array.

Success!
Luc