[QA]How to load parameter in *.m file by matlab script into workspace

Hello Everyone,

I have a ***.m file (Parameter.m).

In the Parameter.m file. I defined CONST_PARAM = 5;

And I had other script file: CallParam()

function CallParam()

run('Parameter.m')

end

But when I run the function CallParam, the parameter CONST_PARAM did not be included into workspace.

The other hand, if you have a other suggestion please tell me.

Please help me.... I am trouble with this problem.

Thank you very much.

[madhan ravi]

Why do you have the need to create CallParam() function in the first place? , why not directly run the script using run()?

[Binh Huynh Thanh]

Because, currently I am wring a tool and it will call a lot of different Parameter files for different condition. And above is the problem I would to help.

Answer 1

[Alex Mcaulley]

The function callParam doesn't have any output variable. Then you need something like

function  CONST_PARAM = CallParam
    run('Parameter.m')
end

And then call the function:

CONST_PARAM = CallParam;

[Binh Huynh Thanh]

Thank Alex Mcaulley,

But maybe, you have other thinking for my question.

I would to explain for more details:

1/ I have a Parameter.m file (as attached)

2/ I also have a other CallParam.m (as attached)

In command window I typed:

>> CallParam

And my expectation is : CONST_PARAM = 5 in the Workspace

But, Currently It did not as my expectation (there is nothing parameter in workspace)

@ As you suggestion :

function CONST_PARAM = CallParam

run('Parameter.m')

end

This function is not executed because there is no value to return;

Thank you.

[Alex Mcaulley]

The variable CONST_PARAM is loaded in the workspace of your function CallParam, but if you don't specify the output as I suggested this variable dissappears when function CallParam finishes.

Then, you have two options:

My previous suggestion:

function  CONST_PARAM = CallParam
    run('Parameter.m')
end

Transform CallParam to script:

%Script CallParam
run('Parameter.m')

[Binh Huynh Thanh]

Hello Alex Mcaulley,

Thank you very much.As so far, I understood your suggestion.

Could I have futher question:

If in the file Parameter.m, I have a lot of Parameter like :

CONST_PARAM = 5;

CONST_PAR = 1;

.............................

CONST_PAMJF = 2;

CONST_PARIEJFI = 3;

In this case, I can not return alot of parameter.

So, how can I do it ?

Thank you very much.

[Alex Mcaulley]

I don't understand why you are using an script to load variables. There are better options like save them in a mat file and then load them in your CallParam function.

By the way, if you still want to do it in the same way, one option is to define all the variables in a struct (data):

data.CONST_PARAM  = 5;
data.CONST_PAR = 1;
data.CONST_PAMJF = 2;
data.CONST_PARIEJFI = 3; %and so on

And then, in you function:

function  data = CallParam
    run('Parameter.m')
end

[Binh Huynh Thanh]

Thank you very much Alex Mcaulley.

Your answer solved my trouble.

@Because this function for testing automatically.

each parameter file is load, test result is different.

By the way, thank again.