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FDS13-Aquamarine
13-Aquamarine
January 2, 2019
Solved

Indexing functions

First of all a happy prosperous and especially healthy 2019 to all! I have apparently a misunderstanding when to use indexing versus vectorisation. In the attached worksheet indexing works but vectorisation doesn't. Could someone help me out with this because I seem to be lost.

Best regards, Filip

Werner_E
Werner_EAnswer
25-Diamond I
January 2, 2019

When doing calculations where you later want to fill in vectors of data I would strongly recommend to set up all those calculations as functions dealing with scalars only and later call those functions vectorized with the data vectors as arguments.

See attached worksheet.

 

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3 replies

terryhendicott21-Topaz II
21-Topaz II
January 2, 2019

Hi,

 

In the first instance of indexing, f(p,i) returns a single value at any point p and thus can be numerically integrated with respect to "p".


In the second instance of vectorisation, f(p) returns a vector as the result. "p" as an input can be either a single value or a vector of similar size to PA50. It is not possible to numerically integrate a function that returns a vector at every point. The integration thus fails.

 

Cheers

Terry

 

 

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    Werner_E
    Werner_E25-Diamond IAnswer
    25-Diamond I
    January 2, 2019

    When doing calculations where you later want to fill in vectors of data I would strongly recommend to set up all those calculations as functions dealing with scalars only and later call those functions vectorized with the data vectors as arguments.

    See attached worksheet.

     

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      FDS13-AquamarineAuthor
      13-Aquamarine
      January 2, 2019

      Terry, thank you so much for the clarification as this explains the why.

      Werner, thank you for your additional hint. It is indeed a much clearer way to do it the way you propose. I will try to use this not only for this worksheet but also for future ones.

      All the best, Filip

       

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