Fons Adriaensen wrote:

On Sat, May 15, 2004 at 07:10:30AM +0200, Marcus Andersson wrote:



Interesting interpretation. This means that the mapping between the slider and the parameter will be

f(x) = k*a^x

with k=f(0) and a = f(1) if the slider goes form 0 to 1.



You probably meant a = f(1)/f(0).


Yes, thanks.

This also means that it is illegal to include 0 in the parameter range.



In that case you can use f(x) = x*a^x, with a = f(1).


How do I invert this function? I am stuck.

What do you propose in the case of [-20.0, 40.0]?

Marcus




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