How can I set input value and output value of a StartFcn?

Hi,

I'm trying to set input value and output value of a StartFcn. I know that the form like " set_param(model_name,'StartFcn','functionname') " is right. But I want to know, whether " set_param(model_name,'StartFcn','[a,b]=functionname(c,d)') " is also right. When not, are there anyway to make it?

Thanks for any help you can give me,

Xiangming

Answer 1

[Sebastian Castro]

Did you try it? Because it works fine for me.

Pretty sure the value of a model's StartFcn parameter is just a free-form string, so any valid set of MATLAB expressions will work. For example:

set_param(bdroot,'StartFcn',['x = 1' char(10) 'y = sin(x);' char(10) '[a,b] = functionname(c,d);'])

(Here, char(10) is the line break character)

- Sebastian

[Xiangming Hao]

Thank you for your answer. I have tried, but it dosen't work.

function test_for_startfcn(model_name)
c = 1;
d= 2;
set_param(model_name,'StartFcn','[a,b] = test_function(c,d)');
sim(model_name);
e = a+b;
end

The test_function is here:

function [a,b] = test_function(c,d)
a = c;
b = d;
end

The Error is undefined function or variables 'c'.

- Xiangming

[Sebastian Castro]

Well, are there variables c and d defined before you call that function? You'd need those too.

[Xiangming Hao]

Hi Sebastian,

I think i have already define the variable c and d before the Code:

set_param(model_name,'StartFcn','[a,b] = test_function(c,d)');