set_param and callback argument

Hello,

I have a syntax question. I would like to use the set_param function to define a callback Startfcn of a simulink block. How can I put an argument to my Startfcn function ?

For example : modelName = 'sim_model.mdl' function_name = 'start_function' set_param(modelName,'StartFcn',function_name);

For example, my Startfcn is like this :

function start_function(abc) display(abc) end

Thnak you in advance.

Answer 1

[TAB]

Where you want to put 'StartFcn' callback function, either for a block or for a whole simulink model ?

For StartFcn of a block:

Get the block handle and use with set_param(). For example

bh=gcbh; % Returns handle of current selected block
set_param(bh,'StartFcn',function_name);

For StartFunc of whole model:

Get the model handle and use with set_param(). For example

open_system(modelName);
mh=get_param(modelName_without_extension,'handle'); % Retuns model handle
set_param(mh,'StartFcn',function_name);

-------------

[ EDITED ]

abc_str=sprintf('%f',abc) % Get the value of abc in string
func_str=strcat('start_function(',abc_str,')');
set_param(mh,'StartFcn',func_str);

You can format string 'abc_str' as per data type of variable 'abc' using %d, %s etc.

Answer 2

[Christophe]

Thank you for your reply.

I am able to use set_param if the startfcn does not have any argument. I would like to know how to do so if I have some input arguments like I wrote in my previous post :

function start_function(abc) 
display(abc) 
end

How can I put the 'abc' argument in the Startfcn callback, I would be glad if you could help me. I have tried :

set_param(modelName,'StartFcn',{@start_function,abc});

It does not work.

Thank you.

[TAB]

Your question is not clear to me.

You can write string 'start_function(abc)' to StartFcn directly by

set_param(modelName,'StartFcn','start_function(abc)'). When you will run the model argment abc will be resolved from base workspace.

Or are you want to pass the *value of abc* to start_function from the set_param() directly ?

[Christophe]

Sorry for my unclear question.

Yes I would like to pass the value of abc.

For example, I calculate abc in the main and want to pass this value to the Startfcn function.

I can get my value by passing through workspace but I thought it could be directly done (without using the workspace)

[TAB]

Please see edited part of my previous answer.

[Christophe]

Thank you but my abc data is a structure. Sorry not to say that at first.

[TAB]

I have to again guess how your structure will be.

Please give some datails. If you can not post original data, express it with examples.