MATLAB Central Newsreader Recent Posts

Mixing valid and full convolution types

David — Sat, 18 May 2013 16:07:09 +0000

Is it possible to have different convolution shapes for each dimension of a matrix (without repmatting or padding)? I would like dimensions 1, 2, and 3 to be valid, while dimension 4 is full.

Re: Genetic Algorithm and Efficient Portfolio

Ryan — Sat, 18 May 2013 14:53:08 +0000

"Phil Goddard" <phil@goddardconsulting.ca> wrote in message <kmmvpf$ls0$1@newscl01ah.mathworks.com>...
> As per the MLEvalString command, the results are generated by the MATLAB command
> [portStd, portRet, portWts, portIndx] = ComputeBestPortfolio(expRet,expCov,portSize,targetRet)
>
> i.e. within the function ComputeBestPortfolio
>
> Phil.

Yes!! But, I still don't really understand how it works? Is the VBA code running built-in functions in Matlab? I assume it is. I think the VBA is calling, and running, functions in Matlab, and the whole process is controlled by the ExcelLink? Is that how it works?

Thanks!!

Re: Cocktail Party Problem

Stan24 — Sat, 18 May 2013 14:30:12 +0000

Hi Silvia,

Try to use the FastICA package for MATLAB:
http://research.ics.aalto.fi/ica/fastica/

Regards,
Stan

Re: gname problem

Stan24 — Sat, 18 May 2013 14:19:10 +0000

I've forgotten to add:
gname(1:10, h1); % returns the wrong handle

how do the integration?

ghasem — Sat, 18 May 2013 14:10:10 +0000

Hi.
I have a simple question about integral.
I have to calculate following integral and next plot it versus theta.my function is:
f1 = I(z)*sin(theta)*exp(jk*z*cos(theta)
f2 = integral ( f1 , dz)
where:
lower limit of integral : z=0
upper limit of integral : z = 0.7
z= linspace(0,0.7,100);
theta = linspace(0,2*pi,360);
k = a given constant.
I(z) = is a given vector same length with z => length(I(z)) = length(z)
NOW:
I have to plot "f2(theta)" versus "theta" in a polar diagram.
How can I do it?
I used from " f2 = trapz(z,f1)" for integration and next plot "f2" versus "theta".
is there any better method?
thanks...

gname problem

Stan24 — Sat, 18 May 2013 13:22:10 +0000

Hi,
Can anyone explain how to add case names to plot:

h1 = plot(1:10, sin(1:10), 'o-');
hold on;
h2 = gscatter(10*rand(1, 10), 2*rand(1,10), 1:10);
hold off;

gname(1:10, h1);

Thanks,
Stan

Re: ? cal the length and area of contours

Cheng Cosine — Sat, 18 May 2013 13:03:26 +0000

Nasser M. Abbasi於 2013年5月18日星期六UTC+8下午6時54分46秒寫道：
> On 5/18/2013 5:36 AM, Cheng Cosine wrote:
>
> > Hi:
>
> >
>
> > One can use contour() to plot contours. But how does one calculate the
>
> > length and area of a contour?
>
> >
>
> > Thanks,
>
> >
>
>
>
>
>
> From help:
>
>
>
> ---------------
>
> load penny;
>
> figure;
>
> contour(flipud(P));
>
> axis square;
>
> ------------------
>
>
>
> So, looking at the above. what length and what area are you
>
> refering to?
>
>
>
> one contour line represent the same value in the data.
>
>
>
> So, I am not even sure what measure of length you
>
> are taking about, and what area you want, since
>
> these lines can all change depending on how many
>
> contour lines you want. If you ask for 2 lines,
>
> you'll get different shapes.
>
>
>
> May be if you explain what is it you are trying to do,
>
> someone might have better suggestion.
>
>
>
> --Nasser

The data file you referred to is too complicated. A single value corresponds
to more than one contours.

Suppose we have a "clean" circular disk and on it we have different contours.

A single value corresponds to a single contour. To be specific, those contours

are closed and concentric circular curves.

If we know the radius of a contour, we can compute its circular length as 2*pi*r and area as pi*( r_outer^2-r_inner^2 ).

What I aksed for were to compute the perimeter and area when the target contour is not a simply cicle or ellipse.

Cocktail Party Problem

Silvia — Sat, 18 May 2013 12:30:10 +0000

Hi Guys,

Any body can tell me where I can find a complete Matlab code that deals with the cocktail party problem using TITO (Two-Inputs Two-Outputs) subband BSS (Blind Source Separation), i.e. using subband filters bank.

Thanks
Silvia

Re: ? cal the length and area of contours

Bruno Luong — Sat, 18 May 2013 12:09:13 +0000

Cheng Cosine <asecant@gmail.com> wrote in message <a100acf9-b4a8-47b8-9b2d-fd49d3f0af2c@googlegroups.com>...
> Hi:
>
> One can use contour() to plot contours. But how does one calculate the
> length and area of a contour?

Use syntax [c h] = contour(...) to retrieve the contour polygons. Then you can compute the length by summing the lengths of the edges, and use polyarea() to compute the surface.

Bruno

set the original phase in Simulink

Mario — Sat, 18 May 2013 11:30:13 +0000

Hi,

I want to know if there is any block or function in simulink with which I can recover the original phase of the signal.

By that I avoid the phase offset before to a QAM demodulator, and get the received constellation has the same phase as the signal sent.

thanks.

Re: Handover simulation in 4G networks

amirjafary@gmail.com — Sat, 18 May 2013 11:18:56 +0000

2LPZhNin2YUgCtix2YjYstiq2YjZhiDYqNiu24zYsQrYqNio2K7YtNuM2K8g2YXbjNiu2YjYp9iz
2KrZhSDYqNio24zZhtmFINio2KfZhNin2K7YsdmHINiq2YjZhtiz2KrbjNivINiq2KfYrtuM2LEg
2Ygg2KfbjNmGINmH2Kcg2LHYpyDYtNio24zZhyDYs9in2LLbjCDaqdmG24zYr9ifINqG2q/ZiNmG
2Ycg2KfbjNmGINqp2KfYsSDYsdinINin2YbYrNin2YUg2K/Yp9iv24zYr9ifCtii2K7ZhyDZhdmG
2YUg2YXZiNi22YjYudmFINiv2LEg2YfZhduM2YYg2LLZhduM2YbZhyDYp9iz2Kog2Ygg2KjZhyDY
tNio24zZhyDYs9in2LLbjCDZhtuM2KfYsiDYr9in2LHZhQ==

Re: EPS bounding box problem

Hermano Cappa — Sat, 18 May 2013 10:56:09 +0000

"Hermano Cappa" wrote in message <kn7lko$22t$1@newscl01ah.mathworks.com>...
> Hi,
>
> When I save a polar plot in Matlab as an EPS file for use in Latex with "Matlabfrag" or "Save as" the bounding box around the outer border (cricle) of my polar plot is partially removed at 0, 90, 180 and 270 degrees.
>
> You can see my polar plot at:
> http://www.xeryon.be/matlab/synchr_vs_asynchr.eps
>
> I think this problem is related with the bounding box of my EPS file. How can I make this bigger?

I was forgot to mention that the polar plot is generated with the "mmpolar" function from the file exchange.

Re: ? cal the length and area of contours

Nasser M. Abbasi — Sat, 18 May 2013 10:54:46 +0000

On 5/18/2013 5:36 AM, Cheng Cosine wrote:
> Hi:
>
> One can use contour() to plot contours. But how does one calculate the
> length and area of a contour?
>
> Thanks,
>

From help:

---------------
load penny;
figure;
contour(flipud(P));
axis square;
------------------

So, looking at the above. what length and what area are you
refering to?

one contour line represent the same value in the data.

So, I am not even sure what measure of length you
are taking about, and what area you want, since
these lines can all change depending on how many
contour lines you want. If you ask for 2 lines,
you'll get different shapes.

May be if you explain what is it you are trying to do,
someone might have better suggestion.

--Nasser

EPS bounding box problem

Hermano Cappa — Sat, 18 May 2013 10:37:12 +0000

Hi,

When I save a polar plot in Matlab as an EPS file for use in Latex with "Matlabfrag" or "Save as" the bounding box around the outer border (cricle) of my polar plot is partially removed at 0, 90, 180 and 270 degrees.

You can see my polar plot at:
http://www.xeryon.be/matlab/synchr_vs_asynchr.eps

I think this problem is related with the bounding box of my EPS file. How can I make this bigger?

? cal the length and area of contours

Cheng Cosine — Sat, 18 May 2013 10:36:24 +0000

Hi:

One can use contour() to plot contours. But how does one calculate the
length and area of a contour?

Thanks,