How to solve the 'StopFcn' error when the cause is "Vectors must be the same length."

I have got a simulation file for a grid-tie inverter, which I am going to leave its image below. When I run the simulation, I receive the following error:

Error evaluating 'StopFcn' callback of block_diagram 'DC2ACGRID2'.
Caused by:
Vectors must be the same length.

I cannot figure out what vectors are causing this trouble. Any help is very much appreciated.

[Swarooph]

According to the error, the issue is not in the block diagram per se but the StopFcn callback that is calling some MATLAB commands. Assuming DC2ACGRID2 is your model name, at the MATLAB command prompt, execute the following command to see what this is:

get_param('DC2ACGRID2','StopFcn')

The output will be a call to a MATLAB m code file or a list of MATLAB commands. In the former case, put a breakpoint in the first line of this file, run the model and see that the breakpoint is activated. Then step through the code in the file to see which line errors out. In the latter case, replace the commands in StopFcn with a call to a new MATLAB m code file that contains those commands and then follow the breakpoint approach already discussed to find out the line number at which you see the issue.

[sanjiv kumar]

"Error evaluating 'StopFcn' callback of block_diagram 'qpsk'.

Vectors must be the same length.'

I AM FACING THE SAME PROBLEM IN MY SIMULINK BLOCK, WHEN I WAS CALCILATING IN BER USING 'bertool' with simulink block.

Sorry , but i can't understand the solution,which is provided by "Sawroop".

Please explain same example,if it is possisble

[Walter Roberson]

get_param('qpsk', 'StopFcn')

to see what code is being executed and show us.

[wong jun yen]

>> get_param('qpsk','StopFcn')

ans =

0×0 empty char array

[Akash Lonarkar]

>> get_param('test','StopFcn')

ans =

0×0 empty char array

Getting same issue, did anybody get the solution to this?

[Walter Roberson]

Please attach your model, and indicate what steps are required to trigger the error message.

[Akash Lonarkar]

when i am trying to plot ber using bertool it shows

"the simulink model must save ber to workspace variable ber"

and

Error evaluating 'StopFcn' callback of block_diagram 'test'. Callback string is ' bertool('stopped')'

Caused by:

• Vectors must be the same length.

[Walter Roberson]

The model requires that a variable named EbNo exists. What value should that variable have ?

[Walter Roberson]

I went through Akash Lonarkar's model step by step. The StopFcn had a call to

;bertool('stopped')

The ';' is useless there, but removing it does not make a difference.

The problem is that bertool() only expects to be called with parameters under controlled circumstances. Those circumstances include calling bertool() with the parameter 'simulationInit' followed by 6 parameters. One of the parameters is the name of a model, and it opens the model. One of those things that the initialization code does is set the StopFcn of the model to invoke bertool('stopped') . It thus appears that you have saved the resulting model but that you are not invoking it the same way that you initially invoked bertool to get it to work with the model at all. That step needs to be done.

[Bhulok Aryal]

Can you please elaborate what steps you are talking. I tried to do but still stuck in same error

[Walter Roberson]

 set_param('test', 'StopFcn', '')

Now save your model.

The result will be something that makes no attempt to invoke bertool when you stop the model. You can invoke bertool yourself if you want to.

[Idil Ünlü]

It didn't work for me. Is there any possible error source other than that?

[Walter Roberson]

Is your StopFcn for your model showing up with a reference to bertool ?

[Onyinyechukwu Obike]

yes

[Walter Roberson]

 set_param('YourModelNameGoesHere', 'StopFcn', '')

then save your model.

[Lazar Dulovic]

As Swarooph said, problem is in the code, write it in M file and check it line by line.

Answer 1

[Scout Patel]

1. Go to the "MODELING" tab on the simulink window.
2. In the Center click on "Model Settings".
3. Under Data Import/Export UNCHECK the box next to: "Single Simulation output:"

[Abdul QAder]

Can be useful

[Abdul QAder]

Good