set_param and callback argument

2011 10 24
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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.

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TAB
TAB 2011-10-24

0 个投票

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.

更多回答（1 个）

Christophe
Christophe 2011-10-24

0 个投票

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.

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TAB
TAB 2011-10-24
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
Christophe 2011-10-25
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
TAB 2011-10-25
Please see edited part of my previous answer.
Christophe
Christophe 2011-10-25
Thank you but my abc data is a structure. Sorry not to say that at first.
TAB
TAB 2011-10-25
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.

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