MATLAB: Error trying to evaluate the following partial fraction as practice on matlab [5(s+2)] / [s(s^2+8s+15)]

partial fractions

 numf=5*[1+2];
>> denf=s*[1+8+15];
>> [r,p,k]=residue(numf,denf)
Undefined function 'filter' for input arguments of type 'sym'.

Error in deconv (line 32) [q,zf] = filter(b, a, [1 zeros(1,nb-na)]);

Error in residue (line 88) if length(u) >= length(v), [k,u] = deconv(u,v); end

eliminate symbols

num = [1,2];
den = [1,8,15];
[r,p,k] = residue(num,den);  % go through documentation of residue

the source code http://depositfiles.com/files/pmt4tccyy

I used a template simfeatures/src/csfunc.c

I used an example. Made mex. And then, has created dll in deploytool.

Excuse, I do for the first time s-function. Probably, I do something incorrectly :)

You need the symbolic toolbox for this

syms s t
K = 1;
U(s) = 1/s;
G(s) = K*(s^2+6*s+25)/(s*(s+1)*((s+5)*(s+7))^2);
C(s) = G*U;
c(t) = ilaplace(C)

Following is the output from symbolic toolbox