Hi,
The syntax of expr is very close to that of the C language. The upchar '^' for expr does not mean to the power of, it is the 'exclusive or' operator.
You can use the following expressions to translate from rectangular to polar coordinates:
x: $f1 y: $f2 magnitude: expr sqrt($f1*$f1+$f2*$f2) phase: expr atan2($f2, $f1) (Replace $f to $v, if you are using expr~ for signals)
atan2() works better than atan() because if you use atan($f2/$f1) you have to do some checking for the case of $f1==0 and figure out the correct phase based on the signs of $f1 and $f2. Also make sure that the y value ($f2) is passed to the expr object prior to the x value ($f1), otherwise you will not get the correct result.
Hope this helps, Shahrokh.
On Sun, 3 Feb 2002, [ISO-8859-1] _-�-_ wrote:
hu
does anyone have a cartesian to polar conversion object, preferably compatible to max "cartopol"?
also i m askingmyself wether cartopol is the same as rectopol.
i tried it with
expr ($f1 ^ 2 + $f2 ^ 2) ^ .5
for radius and
expr tan ^ -1 ($f2/$f1) (this doesnt really work like this in expr)
for the angle, according to some cheesy equation i got off the net but it sort of gives different results from the max version.
x.j
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