How to Plot Signal Flow Graph

Question

I'm currently doing some problem related to digital signal analysis and processing on matlab. I have given a transfer function of 4th order discrete time as shown below.

I have find out the pole & zeros and then convert it to second order section model as

>> b = [0.0018 0.0073 0.011 0.007 0.008];
>> a = [1 -3.0544 3.8291 -2.2925 0.55072];
>> [z,p,k]=tf2zp(b,a);
>> [sos,temp]=zp2sos(z,p,k);

Now I have to draw signal flow graph of value store on sos to represent cascaded structure. My Question is :- Is there any function available or not to draw signal flow graph in matlab?

Answer 1

I found a couple of tools on Matlab's FileExchange:

http://www.mathworks.com/matlabcentral/fileexchange/33735-symbolic-reduction-of-block-diagrams-and-signal-flow-graphs

http://www.mathworks.com/matlabcentral/fileexchange/7224-a-fully-automated-flowgraph-analysis-tool-for-matlab

I don't think there is an original Matlab tool.