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regcurry16-Pearl
16-Pearl
April 29, 2017
Solved

How to access interpolated data to use as a variable??

  • April 29, 2017
  • 2 replies
  • 1574 views

See attached Mathcad file and xls file containing data.

I am trying to increase the number of time points in a field vs. time data file to then use in a subsequent calculation with the increased data points.  The time points are all less than 1.

I cannot figure out how to access the interpolated data to use in a subsequent calculation involving range variables.

Can the range variable to use as the indices be less than 1?  If not, how can this data be used in a time varying calculation?

Thanks for any help.

Reg Curry

Best answer by regcurry

‌I edited this before it posted; for some reason the edited version did not post.  Anyway, I found the answer to my question in an old post via a search of this forum.  If, the edited version ever posts, you will see a link to that answer.

2 replies

W
Werner_E25-Diamond I
25-Diamond I
May 1, 2017

Reg Curry wrote:

See attached Mathcad file and xls file containing data.

No attachment visible!?

If you answer to this and would like to attach files, you first have to click on "Use advanced editor" at the upper right and then you are offered at the lower right the option to attach files.

R
regcurry16-PearlAuthorAnswer
16-Pearl
May 1, 2017

‌I edited this before it posted; for some reason the edited version did not post.  Anyway, I found the answer to my question in an old post via a search of this forum.  If, the edited version ever posts, you will see a link to that answer.

D
DJF16-Pearl
16-Pearl
May 1, 2017

Well, you didn't attach anything, but here's some general interpolation techniques.  Be sure to plot your results to be sure the interpolation is what you want.  At the very end I calculate results for a range variable.

interp.jpg

While more complicated, the B-spline does a nice job of fitting the data.

inter2.jpg

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