Nested Arrays Using Operators and Functions

You can build a nested array by assignment, and it's certainly usefull when providing output (and input) of your own-written functions.

Don't however expect functions like sin(N), |N| or ΣN to return meaningful results if N is a nested array; they might, they may not... The same goes for even simple operators. You can add two same-size matrices or vectors together; once their nested arrays that's not possible.

That's what the message tries to tell you.

Success!

Luc

Andy Stevenson wrote: I'm using MathCAD 15 and Windows 7. From this statement in the help files regarding Nested Arrays: Most of Mathcad's operators and functions do not work with nested arrays Am I correct to conclude that I can't build a nested array using assignment statements? For instance I have test data that includes long periods of quiescent data intermixed with events of interest. I want to strip off the quiescent data and return a nested array of columns of varying lengths  (time) of the event data to get around MathCADs limitation of only returning one value or entity from a program.

You can do a lot with nested arrays - For example, I've build a complete multi-dimensional array (MDA) system with them that provides a major subset of the the standard Matlab / Mathematica / Python capabilities (it actually does a few things that Matlab doesn't (or, didn't at the time I wrote it).

What you're proposing sounds eminently feasible, but you will have to write a number of functions (or programs) to handle the data effectively - nothing too hard, though.   With one level of nesting, you could probably get away with just using the vectorize operator to apply standard functions.  The major problem with Mathcad's nested array is that the indexing isn't that consistent.

Stuart