Export transfer function model to workspace from Simulink without linmod

I want to export the trasfer function of a simple simulink program to the workspace. I know it can be done simply by using the commands

[a,b,c,d]=linmod('model')

sys=ss(a,b,c,d);

tf(sys)

Is there any way to avoid the linmod command? The reason I need to do this is to present this method for people who are not familiar with state-sspace models.

[Azzi Abdelmalek]

Lazaros commented

Isn't there anyone who can help me with this? Thanks again in advance!

Answer 1

[Azzi Abdelmalek]

Edit

Your model name is transfer, and you have two transfer function named Transfer Fcn and Transfer Fcn1

To get the parameters of Transfer Fcn block

num=get_param('transfer/Transfer Fcn','Numerator');
den=get_param('transfer/Transfer Fcn','Denominator');
model=tf(str2num(num),str2num(den))

[Azzi Abdelmalek]

Look at Edit

[Lazaros Moysis]

Though this is helpful, I actually want to get the trasfer function of the whole system (in this case the series connection), not just the tf of a single block.

[Azzi Abdelmalek]

num=get_param('transfer/Transfer Fcn','Numerator');
den=get_param('transfer/Transfer Fcn','Denominator');
num1=get_param('transfer/Transfer Fcn1','Numerator');
den1=get_param('transfer/Transfer Fcn1','Denominator');
model=tf(str2num(num),str2num(den))
model1=tf(str2num(num1),str2num(den1))
modelg=model*model1

[Lazaros Moysis]

You do not understand the point of my question sir. If i am to do all this, of course i might as well not use simulink at all. The question is how can i get the transfer function of a simulink model, without having to use the linmod and the ss command. The model in question could be 10 times more complex, the question remains the same

[Azzi Abdelmalek]

When you read the help of linmod, nothing is referring to an equivalent function, which make me think there is not another way. I think also Its the way simulink stores your model (linear or non linerar), even when you use a transfer function, I think, simulink stores it as state space representation.

[Lazaros Moysis]

Yes this is what i think too, that the models are generated as state-space representations, but since simulink has too many different paremeters to check, I thought maybe there was a way i did not know.

[haryana thomas]

you should type this command in the matlab command line.

plant = linearize('name of simulink model')

tf(plant)

[Raja Singh R]

Thomas, It is showing empty transfer function