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ptc-50710351-Visitor
1-Visitor
November 26, 2013
Solved

How to access non-sequential array indices

  • November 26, 2013
  • 3 replies
  • 1973 views

Sorry if this has been answered before. I have looked around for the last hour or two and can not seem to find anything about this. I've created my own function to solve this issue, but I can't help but think that it should be easier.

I would like to access an array with another array of indices. Unlike a range, these indices are non-sequential. When I try to access the array just like a range would, it says that the value must be an integer. I've also tried vectorizing it, to no avail.

Any insight you guys might have would be greatly appreciated. I'm using Mathcad Prime 2.0, by the way.

Best answer by Werner_E

What do you mean by "access" the first array? Selecting a subset of data values in the first vector given by another array of indices?

If yes, here are two possible solutions:

VectorSubset.png

3 replies

Werner_E
Werner_E25-Diamond IAnswer
25-Diamond I
November 26, 2013

What do you mean by "access" the first array? Selecting a subset of data values in the first vector given by another array of indices?

If yes, here are two possible solutions:

VectorSubset.png

ptc-50710351-VisitorAuthor
1-Visitor
November 26, 2013

That's exactly what I was looking for! Thank you!

Werner_E
Werner_E25-Diamond I
25-Diamond I
November 26, 2013

You are welcome.

Here is a third way using a local function and vectorization:

VectorSubset2.png

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