Simulink: How can I throw errors with the initialization commands in a masked subsystem?

Hello! I would like to evaluate parameters of a masked subsystem within the initialization code. The mask is created with the mask editor. The initialization code calls a m-function and passes the parameters of the block to this function. If e.g. the mass is negative, I wanto to display an error in the matlab command window.

if mass<0
   error('mass is negative!')
end

If I use this code at the beginning of my initialization code, no error is displayed and the block doesn't initializes properly.

Does anyone know a solution? Thanks!

[Kaustubha Govind]

Why not use the parameter callback function instead? That is probably the right place to validate parameters anyway.

Answer 1

[Martin]

@Jeremy: It doesn't seem to work either...

@Kaustubha Govind:

I already tried to evaluate the parameters with the parameter callback function. The Dialog Callback calls an m-function:

hidden_block_cb(gcb,get_param(gcb, 'm'))

This seems to work if I type e.g. 5 in the block dialog box.But I would like to save the parameter mass=5 in the matlab workspace and then type 'mass' in the block dialog box. But then I get an error:

Error due to multiple causes ->Undefined function or variable 'mass' ->Error evaluating 'MaskCallback' of ... Undefined function or variable 'mass'.

I think to problem is that the get_param. But

hidden_block_cb(gcb,m)

doens't work either.

???

[Kaustubha Govind]

Does this work:

hidden_block_cb(gcb,str2num(get_param(gcb, 'm')))

[Martin]

This worked out! Thanks a lot :)

Answer 2

[Jeremy]

Perhaps the error is being thrown too low? Try throwAsCaller, and see if that works.

Answer 3

[Carlos]

Hi,

I am having a similar issue, and I do not understand the proposed solution of using hidden_block_cb.

From the mask initialization tab I am trying to check the value of a variable. If loc == 999 I want to raise a warning. i.e. I want a warning to be shown in the Matlab command line. But using warning('message') or error('message') does nothing. Any ideas on how to do this? Thanks!