writing matematical expression with f power2
Nov 29, 2012 at 9:31am
writing matematical expression with f power2Dear all I would like to now if it's possible to write mathematical expression with f power 2 [attachment=209364,4696] 

Nov 29, 2012 at 10:05am
Hi Mortimer, What is the formula for? Not sure how to do this with [expr]. You can always patch it using several math objects for each calculation or if you use IRCAM’s FTM libraries ( http://ftm.ircam.fr/index.php/Main_Page ) you can do it like this: – Pasted Max Patch, click to expand. –
Copy all of the following text.Then, in Max, select New From Clipboard.
Hope it helps 

Nov 29, 2012 at 11:01am
I obtain here a result to convert frequency to dba so now i woud like the inverse result : – Pasted Max Patch, click to expand. –
Copy all of the following text.Then, in Max, select New From Clipboard.


Nov 29, 2012 at 1:50pm
why don’t you implement this as a lookup table? With Buffer~ eg. 

Nov 29, 2012 at 11:01pm
For a lot of reasons I prefer to write f^2 in an expr as f*f: [expr $f1*$f1]. The generalpurpose exponentiation of $f1^$f2 is [expr pow($f1,$f2)]. But you seem to have worked that out, so I’m not sure what you need help with. The thing is that pow() can be a fairly expensive function call, whereas multiplication is just a multiplication. I’m not sure if the implementation of pow() used by Max in expr optimizes for simple integer exponents, but I wouldn’t rely on it. 

Nov 30, 2012 at 1:26am
i agree, it should make more sense to use a table or signal look up table. 

Nov 30, 2012 at 8:26am
Do I understand well that the original question is that you want to isolate the term (f to the power of 2) so that you can find the inverse relationship? It’s too long ago I worked with the math to do such things. Keep in mind however that the inverse is not a function, as the function you describe is parabolic; you would need to define the inverse with two functions. 
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