[PD] numbers seem to be wrongly adding up

[rolfm at dds.nl]

hi, 

working on a simulation patch i've difficulties with wrong results from
additions. 

in a periodic loop a [value V] is added up with a constant. 

a simplified version: 

[t b] - [v V] - [+ 0.0025] - [v V] 

it starts at 0. 

looking at the numbers when put in an array i see that e.g. 

the value that should be 0.1250 is actually 0.1249999 

and 0.75 is actually 0.7499994. 

in the loop this variable is used for calculations which multiply the
deviations. 

why does this simple addition not giving the exact result? 

rolf
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