Register to reply

MATLAB symbolic to numeric

by sinusance
Tags: fft, matlab, numeric, symbolic, transfer function
Share this thread:
sinusance
#1
Mar31-09, 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 s-domain 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 s-domain 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)
Phys.Org News Partner Engineering news on Phys.org
Tiny UAVs and hummingbirds are put to test
Britain to trial driverless cars from 2015
NIST corrosion lab tests suggest need for underground gas tank retrofits
MATLABdude
#2
Apr1-09, 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
sinusance
#3
Apr5-09, 06:38 PM
P: 4
Thanks a million MATLABdude,
That tutorial held all the answers and more! :)


Register to reply

Related Discussions
Help in second order ode numeric solution Differential Equations 0
MATLAB symbolic function shouldn't be symbolic Programming & Computer Science 0
Numeric keypad Computers 0
Symbolic intergration in Matlab using INT command? Math & Science Software 3
Numeric Nonsense Fun, Photos & Games 2