Well, here's what works if one value is zero and the
other is a positive number:

#declare TotalLen = 62;
#declare StartVal = 1;
#declare EndVal = 0;
#declare nRange = EndVal - StartVal;

#if (nRange != 0)
    #declare nSteps = ((TotalLen / abs(nRange)) * 2) + 1;
    #declare ChgVal = nRange / nSteps;
#else
    #declare ChgVal = 0;
#end

Then subtract ChgVal from StartVal for every iteration. When
StartVal reaches EndVal, TotalLen is achieved.

The problem is, I want it to be able to work for an ending
or starting value that's not zero, like starting at 4 and stopping
at 2. Why does it only work for values that either start or end
at zero? It works if StartVal = 0 and EndVal = 10 and such.

Thanks for your help.
Have a great day!
=Bob=

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