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Re: induction motor simulation connected to brake

Tamir Suliman — Fri, 03 Sep 2010 01:50:24 -0400

"khalid algbali" <aba_anas75@yahoo.com> wrote in message <i56ufm$k96$1@fred.mathworks.com>...
> hi
>
> my problem is how i can simulation single phase induction motor with brake
> could you please help me
>
> khalid.

kHALID

Please post a reference equations and files that reference what you needed to do.

When you said simulation do you mean a code or simulink ?

Re: Hdl code generation error

Mira Ab — Fri, 03 Sep 2010 01:45:22 -0400

"Sean " <sanborne@fastmail.fm> wrote in message <i5oa64$qv$1@fred.mathworks.com>...
> "Mira Ab" <a_m_i_r_a_h_109@hotmail.com> wrote in message <i5hri1$11m$1@fred.mathworks.com>...
> > Hi
> >
> > I have a problem when generating HDL for my set of Simulink codes. I got a error stating that 'matrices are not in this release'. Do anyone know about this problem?
> >
> > Can anyone tell me whether I can generate a from video device block and translate block?
> >
> > Thanks
>
> You have a lot of work to do. As the error message says, because matrices are not supported, you will need to stream the data a pixel at a time. If I remember correctly (I do not currently have access to the HDL coder), you should be able to use either one or two dimensional signals within an embedded Matlab block. But it would be a lot of work to stream the data in and out of embedded Matlab, and perhaps not worth the effort.
>
> You might be better off either hand coding your algorithms in HDL and using Matlab as a testbench.
>
> Sean

Hi
I don't quite understand what do you mean by stream the data a pixel at a time. Does this mean that I will have to change my codes? Would you mind giving me some hints on ways of changing it?

Thanks

Arithmatic operation for different matrix dimension

Tanvir — Fri, 03 Sep 2010 01:32:04 -0400

Hi, I am new in matlab and would like to do arithmatic operation for different matrix dimensions. For instance:
A = [1 2 3; 4 5 6;] (2x3 matrix)
B= [1; 2;] (2x1 matrix)
How can I multiply A*B?
Basically, I would like to get the result like this:
A*B = [1x1 2x1 3x1; 4x2 5x2 6x2;]

Concatenation in Simulink

Paburo — Fri, 03 Sep 2010 01:24:04 -0400

Hi,

Two constant arrays 2x2 were defined using Source Blocks in Simulink.
They were concatenated (e.g. horizontally).
Result was assigned to the variable zz using 'To Workspace' block.

If the 'To Workspace' block parameter 'Limit data points to last' is equal to 1 than zz is 2x4 matrix.
If 'Limit data points to last' is the default inf or 2 than zz is 2x4x2 matrix, two identical 2x4 matrices in two planes.

Why is 2x4x2 matrix in the latter case?

Regards,

Pavel

Re: Analytical solution of an ODE

Ross W — Fri, 03 Sep 2010 01:17:06 -0400

Torsten Hennig <Torsten.Hennig@umsicht.fhg.de> wrote in message <510791724.152843.1283410474690.JavaMail.root@gallium.mathforum.org>...
> > How about this?
> > y = dsolve('D2y =
> > k*sqrt(1+Dy^2)','y(0)=0','Dy(0)=0','x')
> >
> > Answer:
> > y =
> > -1/k*cosh(x*k)+1/k
> > 1/k*cosh(x*k)-1/k
> >
> > Have I got it?
> >
> >
>
> Inserting the "solutions" into your differential
> equation, only the second one from above is correct.
>
> Best wishes
> Torsten.

Hmmm, I think that depends on what sqrt() means. If it's the positive or negative square root, then couldn't there be two solutions?

d2y/dx2=k sqrt(1+dy/dx^2) %the original equation
let z = dy/dx % a substitution to help me
then dz/dx = k sqrt(1+z^2) %insert my substitution in the equation
(dz/dx)^2=k^2 (1+z^2) %square both sides of equation

and then it seems to me that +/-z are both solutions, which tells me that +/-y are both solutions.

Ross

PLSREGRESS

Frank Sabouri — Fri, 03 Sep 2010 01:09:04 -0400

Hello everybody,

Using this function "[XL,YL,XS,YS,B,PC,MSE,stats] = PLSREGRESS(x,y,2,'CV',5)", in that number of cross-validation is five, I would expect to get five different outputs for each output. For example I would like to extract these outputs [XL1, XL2...., and XL5], [YL1, YL2...., and YL5], and so on. Please let me know how I could extract these replicates from the function.

Thanks,
Frank

mupad notebook engine synchronization

Melissa — Fri, 03 Sep 2010 01:04:05 -0400

Hi all,

I have a mupad notebook that I want to access from matlab. I create a handle to the notebook:

nb=mupad('test_nb.mn');

I know I need to synchronize the mupad notebook with its engine before I can access any of the equations I have in there. All the documentation I read says to go into the notebook menu and choose 'evaluate all'. And it I do this, it works fine.

My question is: is there a way to automatically get the notebook to synch so that I can call a bunch of stuff from matlab without having to stop and do "evaluate all" from the notebook menu? or if not automatically, is there a function call or something that I can put in my matlab script to make the notebook synch with its engine?

thanks,
melissa

Re: Problems with checkbox

Matthias — Fri, 03 Sep 2010 00:57:04 -0400

Thanks Walter,

I pasted it inside the function and it worked perfectly,

Thanks again

G

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Re: Keyboard stops working (Linux)

Jackson Tan — Fri, 03 Sep 2010 00:50:07 -0400

Just to throw in a comment that I'm facing the same problem as well. I'm using R2010a on Ubuntu 10.04. Happened numerous times.

MatLab stops taking in keyboard inputs even though it is obviously working with other applications. MatLab is not busy either, since mouse buttons work. I'm not certain what triggers it, but I think it is probably windows/desktop switching (i.e. outside MatLab).

Puzzling, and irritating (especially when re-running the script will take several minutes and stretch my computer).

Jackson

"Matthias " <matthew.goddard@bcf.uni-freiburg.de> wrote in message <i5l59s$8j1$1@fred.mathworks.com>...
> Just did it again. This time completely independently of the Tab key. It actually stopped accepting keyboard input when I opened the help file!
>
> Will submit this as a bug report.
>
> Thanks for your comments & suggestions.

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