visualdatatools.com

Paul Williamson · Joined: 29 Nov 2006 Posts: 88

I *must* be missing something in the expression syntax.

x*y -- OK
-x*y -- OK
x*-y -- "Illegal argument for binary operator"

This is with the latest beta 3.0.

David · Posted: Thu May 19, 2011 8:07 am Post subject:

x*(-y)

David

Paul Williamson · Joined: 29 Nov 2006 Posts: 88

OK, that's another workaround.

I'm curious about why this limitation arises. Is there some special syntax that DataGraph's expression evaluator accepts that makes unary negation and binary operators parse in this unusual way?

I didn't find anything about this limitation (or, indeed, about arithmetic operators at all) in the help.

David · Posted: Thu May 19, 2011 8:57 pm Post subject:

I tweaked things so that x*-y is supported.

Will be in the next beta. Thanks.

David

wkramer · Joined: 26 Mar 2009 Posts: 7

But then x / -y should also be supported (and if you are really consequent x + -y and x - -y). And what about x ^ -y?

In general is is allowed to assume that the minus sign following a binary operator negates the second operand?

David · Posted: Mon May 23, 2011 1:42 pm Post subject:

I agree. I tweaked things so that this would work.

I also found a problem that was related to this, such as x>-y and fixed it. Uploaded a new beta.

David