Conversion to double from tf is not possible

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md
md 2014-4-8
评论： md 2014-4-11
Hi I am new in Matlab...... i am working on suspension system..so I need to filter my acceleration found from random input. I am using 2nd order butter worth filter. Here is the code i tried....
ts = 0.001; t = 0:ts:10; n=2; Fs=1000; w=.10; z=.7;(the value of parameter)
num=[1/w^2];
den=[1/w^2 2*z*w 1];
sys=tf(num,den);
filter= sys*y3;% (here y3 means the equation of the acceleration found after input random track input)
Now then I tried to plot the result...like this way...
subplot(2,1,1), plot(t,y3),title('passive_ acceleration')
subplot(2,1,2), plot(t,filter), title('filtered_ acceleration')
Then it shows that 'Conversion to double from tf is not possible'....Please help me...I am stuck here badly.....

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Walter Roberson
Walter Roberson 2014-4-8
You should be using the filter() call to filter your data; see http://www.mathworks.com/help/signal/ug/filter-implementation-and-analysis.html#f1-821
It is not advisable to use "filter" as the name of a variable, as that will interfere with calling the filter() function.

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