[PD] numbers seem to be wrongly adding up

[rolfm at dds.nl]

thanks Roman for replying 

i had the, apparently, wrong idea that it were the big numbers giving
problems when using floating point arithmetic. 

now, after reading up about the 'perils of floating point' i have to
rethink my method of calculation. 

rolf 

Roman Haefeli wrote: 

>>The intricacies of 32bit floating point numbers have been discussed up 

>>and down on this list.

>>tldr; many decimal numbers do not have an exact floating point
>>representation. Incrementing with such numbers increases the error on
>>each iteration

>>Suggestion: Count with integer numbers and scale afterwards.

>>Roman
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