Variable Type "Generator" in Function

Forum|Forum|10 years ago
February 9, 2016
2 replies
5696 views

Hey guys,

I'm trying to build a function which multiplies a vector with each column of a matrix and returns this 'multiplied' matrix.

However I get some errors I don't understand.

I have the feeling that mathcad fails to cope with this "generator-type" (e.g. 0..6) inside functions. However it could be a usage error

The sheet is attached below, does anyone see what is wrong with this or knows an easier way to solve the problem?

1_Error_in_Function-mcdx.zip

Other

Best answer by LucMeekes

The error message isn't "Shitty", but righteous. There are several problems with your program. First you are defining M2 as a range, then in the for-loop you are using this M2 in an augment statement (that requires a vector or matrix as its argument) and assigning the result of the augment back to M2....

Is this what you are looking for?

Success!
Luc

L

LucMeekes

Answer

23-Emerald IV

The error message isn't "Shitty", but righteous. There are several problems with your program. First you are defining M2 as a range, then in the for-loop you are using this M2 in an augment statement (that requires a vector or matrix as its argument) and assigning the result of the augment back to M2....

Is this what you are looking for?

Success!
Luc

S

sthomet

Author

1-Visitor

Thanks for the answer, I knew there was an easier solution...

But please note that using a range (or "generator" because that's what I meant) as a vector is normally fine:

So I stand by my statement that this error is !

W

Werner_E

25-Diamond I

> note that using a range (or "generator" because that's what I meant) as a vector is normally fine:

No, its not.

It may only look fine and ranges unfortunately look like vectors but they aren't. Ranges are iterators and should only be used for plotting, for-loops and indexing matrices (or vectors).

In your case you had used (without knowing, I guess) an undocumented trick: If you follow the range definition by a numeric evaluation (=), the range is converted to a vector.

So the r in your augment command is already a vector.

WE

W

Werner_E

25-Diamond I

However it could be a usage error

It is, as Luc already pointed out.

You wanted to create a dummy vector of the right size in the first line of your program but created a range variable. You can create that vector by simply assigning the last component any value.

You also had two errors (wrong indices) in your submatrix command.

Your routine works if you make the appropriate corrections