Error in Using set_param

I've not been able to set the consant in the "constant" block. I used: set_param('dummy/Constant','x',50) but kept getting eroor "Constant block does not have a parameter named 'x'". 'dummy' is the model name.

Thanks.

Answer 1

[William]

I still got error: "Invalid setting in Constant block 'Constant' for parameter 'Value'. 'x' is in the place of the 'constant' block where the numeric value is given.

[William]

>> set_param('dummy/Constant','X',50) Constant block does not have a parameter named 'X'

[William]

>> set_param('dummy/Constant','x','50') Constant block does not have a parameter named 'x'

[Brian B]

The error is telling you what you need to know: There is no parameter named 'x'. The parameter is called 'Value'. Try EXACTLY THIS LINE:

   set_param('dummy/Constant','Value','50')

[William]

how can I replace the constant value with a variable (x in this case) & set x to the value I want? Thanks (I got with it worked with your suggestion above).

[Brian B]

If x is a variable in the workspace, then you can use

   set_param('dummy/Constant','Value','x')

Answer 2

[Brian B]

Try

   set_param('dummy/Constant','Value','50')

Note that the value is also a string.

[William]

I still got error: "Invalid setting in Constant block 'Constant' for parameter 'Value'. 'x' is in the place of the 'constant' block where the numeric value is given.

[Brian B]

Can you post the exact command that you tried? If I run

   set_param('untitled/Constant','Value',50)

I get the error you describe. If I replace 50 with '50', I do not get an error.

[William]

how can I replace the constant value with a variable (x in this case) & set x to the value I want? Thanks.

[Fuli Wang]

x=50;

set_param('untitled/Constant','Value',num2str(x));