Function error: Operator < not defined for bool and double

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Permalink Reply by David Rutten on April 21, 2011 at 12:36pm

y<x<z is evaluated in two steps. This becomes more obvious once we add precedence brackets to show this:

(y < x) < z

The above results in exactly the same code. So first y and x are compared and the result is a boolean. y is either smaller than x or it isn't, so:

1.   (y < x) = True

2.   (y < x) = False

We can now replace the evaluation with the result, giving us:

1.  True < z

2.  False < z

This is a not a valid comparison, as Boolean values are not smaller than numbers in any meaningful way.

To do what you want you'll need to perform both comparisons individually, then combine the results using a Boolean Gate:

(y<x) And (x<z)

--

David Rutten

david@mcneel.com

Poprad, Slovakia