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MATLAB symbolic to numeric 
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#1
Mar3109, 01:32 PM

P: 4

hey,
I'm trying to use matlab to simulate a simple RC low pass filter. I have an array of data that represents the signal I want to filter, and I have the sdomain representation of the filter circuit. I'm pretty new to this type of analysis, but I'm pretty sure I should be taking the fft of my data and multiplying it by the sdomain representation (transfer function) of the circuit, and then take the ifft to get the output. I guess my problem is I have a symbolic transfer function that I'm trying to multiply with a numeric array. Any Ideas on how I can get a numeric representation of my symbolic transfer function? Thanks in advance. (this is my transfer function if that helps) transferFunc = 100/(s+100) 


#2
Apr109, 03:37 AM

Sci Advisor
P: 1,724

You probably want something called a Bode plot (magnitude and phase angle of a Linear Time Invariant system):
http://en.wikipedia.org/wiki/Bode_plot If you have the MATLAB Controls Toolbox, you can generate a Bode plot of a system given its transfer function: http://www.mathworks.com/access/help.../ref/bode.html An example: http://www.engin.umich.edu/group/ctm/freq/freq.html 


#3
Apr509, 06:38 PM

P: 4

Thanks a million MATLABdude,
That tutorial held all the answers and more! :) 


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