Comments for Seth on Simulink http://blogs.mathworks.com/seth This blog is about Simulink. Sat, 21 Nov 2009 03:08:49 +0000 http://wordpress.org/?v=2.3.1 Comment on How did I get an algebraic loop error, when the diagnostic was set to warning? by Mohamamd http://blogs.mathworks.com/seth/2008/07/03/how-did-i-get-an-algebraic-loop-error-when-the-diagnostic-was-set-to-warning/#comment-899 Mohamamd Wed, 18 Nov 2009 15:23:38 +0000 http://blogs.mathworks.com/seth/2008/07/03/how-did-i-get-an-algebraic-loop-error-when-the-diagnostic-was-set-to-warning/#comment-899 Hi Suth, I try to simulate a load tap-changing transformer in simulink but its control part has to be impelented in stateflow, I did it but simulating the system I get this error message, Trouble solving algebraic loop containing 'handy_ltc23/Three-Phase OLTC Regulating Transformer/Chart' at time 5.033333333333321. Stopping simulation. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances) The point is that I have to use stateflow for its control part and I can't refuse that, inside the stateflow chart I just want to update a variable one unit every 4 sec, can Not I do it? I'll be very grateful if you give me a key regards Mohamamd Hi Suth,
I try to simulate a load tap-changing transformer in simulink but its control part has to be impelented in stateflow, I did it but simulating the system I get this error message,
Trouble solving algebraic loop containing ‘handy_ltc23/Three-Phase OLTC Regulating Transformer/Chart’ at time 5.033333333333321. Stopping simulation. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)
The point is that I have to use stateflow for its control part and I can’t refuse that, inside the stateflow chart I just want to update a variable one unit every 4 sec, can Not I do it?
I’ll be very grateful if you give me a key
regards
Mohamamd

]]> Comment on Back-Seat Driver: Simulink Tips for Efficient Model Navigation by Han Geerligs http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-898 Han Geerligs Wed, 18 Nov 2009 14:07:20 +0000 http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-898 Hello Guy, thanks for the clarificaton and link. However in the documentation I am missing the behaviour of combined (scroll)mouse and keyboard action (e.g. shift-scroll). Also the shortcut for look under masked subsystems (CTRL-U) is missing. -Han Hello Guy,

thanks for the clarificaton and link.

However in the documentation I am missing the behaviour of combined (scroll)mouse and keyboard action (e.g. shift-scroll). Also the shortcut for look under masked subsystems (CTRL-U) is missing.

-Han

]]> Comment on Back-Seat Driver: Simulink Tips for Efficient Model Navigation by Guy http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-897 Guy Wed, 18 Nov 2009 13:28:52 +0000 http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-897 @Han, you probably already know, but I think it is good to share with everyone. To zoom in use the key 'r'. If you have nothing selected it will zoom toward the middle. If you select a block it will zoom, putting the focus on this block. Very useful to navigate a model whith many blocks on the same level. For other zooming feature: r - zoom in f - Fit the selection to screen space - Fit the system to screen v - zoom out 1 - zoom 100% I always have problems finding the complete list of Simulink shortcut. Here is the list: http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/ug/f2-82531.html#bqgwups Another one which I like is CTRL+U to look under masked subsystems. Guy @Han, you probably already know, but I think it is good to share with everyone.

To zoom in use the key ‘r’. If you have nothing selected it will zoom toward the middle. If you select a block it will zoom, putting the focus on this block. Very useful to navigate a model whith many blocks on the same level.

For other zooming feature:
r - zoom in
f - Fit the selection to screen
space - Fit the system to screen
v - zoom out
1 - zoom 100%

I always have problems finding the complete list of Simulink shortcut. Here is the list:

http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/ug/f2-82531.html#bqgwups

Another one which I like is CTRL+U to look under masked subsystems.

Guy

]]> Comment on Back-Seat Driver: Simulink Tips for Efficient Model Navigation by Han Geerligs http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-896 Han Geerligs Wed, 18 Nov 2009 12:17:35 +0000 http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-896 Hi Seth, Once again I'd like to point out that my biggest accelerator is using mouse and keyboard in conjunction. for example: using the shift key and scroll in order to pan horizontally. And once again I'd like to add my suggestion: please implement the control-scroll option: zooming in and out, as in most office suites. Now ctrl-scroll is the same as shift-scroll, and hence doesn’t add anything. I wonder what is the status of this enhancement request? Warm regards, Han Hi Seth,

Once again I’d like to point out that my biggest accelerator is using mouse and keyboard in conjunction. for example: using the shift key and scroll in order to pan horizontally.

And once again I’d like to add my suggestion: please implement the control-scroll option: zooming in and out, as in most office suites. Now ctrl-scroll is the same as shift-scroll, and hence doesn’t add anything.
I wonder what is the status of this enhancement request?

Warm regards, Han

]]> Comment on Back-Seat Driver: Simulink Tips for Efficient Model Navigation by XaL http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-895 XaL Wed, 18 Nov 2009 08:22:39 +0000 http://blogs.mathworks.com/seth/2009/11/18/back-seat-driver-simulink-tips-for-efficient-model-navigation/#comment-895 Hi, thanks for the tips. As someone wrote in http://blogs.mathworks.com/seth/2009/03/13/new-%C2%A0release-%E2%80%93-simulink-r2009a/ the Linux version does not even have a Model Browser, which is ever more annoying than clicking on this toolbar on Windows :-) Is the "major architectural upgrade" needed to bring this toolbar under Linux on its way? Thank you Hi,

thanks for the tips. As someone wrote in http://blogs.mathworks.com/seth/2009/03/13/new-%C2%A0release-%E2%80%93-simulink-r2009a/ the Linux version does not even have a Model Browser, which is ever more annoying than clicking on this toolbar on Windows :-)
Is the “major architectural upgrade” needed to bring this toolbar under Linux on its way?

Thank you

]]> Comment on How Many Blocks are in that Model? by Uba osy http://blogs.mathworks.com/seth/2009/08/11/how-many-blocks-are-in-that-model/#comment-894 Uba osy Wed, 18 Nov 2009 02:28:30 +0000 http://blogs.mathworks.com/seth/2009/08/11/how-many-blocks-are-in-that-model/#comment-894 Hi, in the introductory example for fuzzy logic toolbox it was noted that using non fuzzy means, you could "Specify that service accounts for 80% of the overall tipping grade and the food makes up the other 20%". Can you do this using the fuzzy logic toolbox of matlab. Can you give weights to diffrenet inputs. Hi,

in the introductory example for fuzzy logic toolbox it was noted that using non fuzzy means, you could “Specify that service accounts for 80% of the overall tipping grade and the food makes up the other 20%”. Can you do this using the fuzzy logic toolbox of matlab. Can you give weights to diffrenet inputs.

]]> Comment on MathWorks Conversations and the FFT by Prashant http://blogs.mathworks.com/seth/2009/01/30/mathworks-conversations-and-the-fft/#comment-893 Prashant Thu, 12 Nov 2009 15:47:19 +0000 http://blogs.mathworks.com/seth/2009/01/30/mathworks-conversations-and-the-fft/#comment-893 How can I have same example but instead AC(1 to 10V 50 or 60Hz) and DC(0.5 to 10 V) then adding AC+DC but out put should be only DC signal? I will be very glad to know if this kind of*. m code can be transferred to simulink block where the block accepts AC+DC as input and the out put as DC signal only. This example is quite good to know. How can I have same example but instead AC(1 to 10V 50 or 60Hz) and DC(0.5 to 10 V) then adding AC+DC but out put should be only DC signal? I will be very glad to know if this kind of*. m code can be transferred to simulink block where the block accepts AC+DC as input and the out put as DC signal only.

This example is quite good to know.

]]> Comment on Modeling Mechanical Systems: The Double Pendulum by adrian chavarro http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-892 adrian chavarro Wed, 11 Nov 2009 12:53:20 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-892 Great tool, for educational and sicentific, simulation. I would like to know where can i place a motor for controlling position on inverterted pendulum....thanks... Great tool, for educational and sicentific, simulation.

I would like to know where can i place a motor for controlling position on inverterted pendulum….thanks…

]]> Comment on Generated Code for Variable Size Signals by Ashish Sadanandan http://blogs.mathworks.com/seth/2009/11/06/generated-code-for-variable-size-signals/#comment-891 Ashish Sadanandan Sun, 08 Nov 2009 15:16:17 +0000 http://blogs.mathworks.com/seth/2009/11/06/generated-code-for-variable-size-signals/#comment-891 @wei, I was talking about the case where the compiler would perform the 'model_Xdim-1' operation each time through the loop before checking the exit condition. @wei, I was talking about the case where the compiler would perform the ‘model_Xdim-1′ operation each time through the loop before checking the exit condition.

]]> Comment on Generated Code for Variable Size Signals by wei http://blogs.mathworks.com/seth/2009/11/06/generated-code-for-variable-size-signals/#comment-890 wei Sat, 07 Nov 2009 14:51:48 +0000 http://blogs.mathworks.com/seth/2009/11/06/generated-code-for-variable-size-signals/#comment-890 @Ashish, I agree with your observation on compiler optimization but fail to see why Han's code would be less efficient than the original. Would you explain? @Ashish, I agree with your observation on compiler optimization but fail to see why Han’s code would be less efficient than the original. Would you explain?

]]>