William F Pokorny <ano### [at] anonymousorg> wrote:
> On 10/03/2016 08:06 AM, John Greenwood wrote:

> >   #declare Change = true;
> >   #declare Function = function( F){select(Change,F,-F)}

> Note there are two select variants. ....
> Then a second form which supports both such transitions and the boolean
> form.


So, the thing(s) to try would be:

#declare Change = true;
#declare Function = function (F) { select(Change, F, F, -F) }

or

#declare Function = function (F) { select(Change, F, -F, -F) }

Correct?

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