main problem: i want to control an osc~ by a logaritmic curve. i use a vline~ to track the linear line, and an expr~ to wrap into a log(..) curve.
the problem is that expr~ complains about a division by zero. i inserted a number to check if is it true... and in the fact the "dividendo" is not zero.
how can i solve this problem? (the problem of: having a linear/logarithmic/exponential vline~ object)
many thanks
federico ha scritto:
main problem: i want to control an osc~ by a logaritmic curve. i use a vline~ to track the linear line, and an expr~ to wrap into a log(..) curve.
the problem is that expr~ complains about a division by zero. i inserted a number to check if is it true... and in the fact the "dividendo" is not zero.
how can i solve this problem? (the problem of: having a linear/logarithmic/exponential vline~ object)
many thanks
i forgot to attach the example patch: SFX~.pd
the formula I tested in gnuplot is: gnuplot> plot [0:1] log(x*10.93+1)/log(10.93+1)
where 10.93 could be a value >0 and it controls the amount of curve. in the patch i replaced the last part ("log($v2+1)") with "$v3" just to check its value it was not zero.
if you disconnect [expr~ ....] from [osc~], and connect the first [vline~] to [osc~] you get the traditional behavior, with linear interpolated points.
how do you solve this problem in the signal domain? lop~? how does lop~ react to quick changes of cutoff frequency?
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federico