Matlab Forum RSS Feed (Replies Included)

Re: SVD inconsistency

Fri, 20 Nov 2009 19:53:54 -0700

It should work. I can't see the problem...

From time to time there are some bugs appearing in Matlab...
Try to clear your workspace and try again.
Or exit from Matlab, re-enter and retry your function.

Do this to test it

clear; clc; format compact

A = [1 2 3
4 5 6
7 8 9
1 2 3
8 6 2]

[u s v] = svd(A);
m = u*s*v'

Does m equal A?

Re: MATLAB GUI

Fri, 20 Nov 2009 19:40:11 -0700

I don't want to post this message but I don't know how to delete it...

Re: MATLAB GUI

Fri, 20 Nov 2009 19:38:23 -0700

I suggest you review this site:

http://www.matrixlab-examples.com/matlab-gui-2tier.html

It's a tutorial on GUIs.
It teaches how to use 'axes' to plot data.

Good luck!

MATLAB GUI

Thu, 19 Nov 2009 22:06:09 -0700

Hi guys,
Iam working to create a GUI using matlab. my program is being executed well iam getting output. but the thing is that when i want to plot the data using a GUI its giving problem. So can anyone help me out with this problem

Subscripted assignment dimension mismatch

Wed, 18 Nov 2009 06:45:50 -0700

Hi Everyone

I have stored a few values in a structure. I am using the getfield()
function and after getting value of a single element which satisfies a
condition storing it in a variable varx

The situation is like this:
for i=1:4
for n=1:4
varx(i,:) = getfield(J,{n,1}, 'val')
end
end

The 'val' field of the structure has values in the form
j1,j2,......j15. J is the name of the structure.
I have no problem if the 'val' field has values upto 'j9'.
But when the selected value is in the range j10,.....j15
i get the following error:
??? Subscripted assignment dimension mismatch.

Any help in this regard is highly appreciated.
Regards

SVD inconsistency

Tue, 17 Nov 2009 19:54:00 -0700

Cannot figure out why the Matrix S1 and S2 differ. Seems to work when the Matrix S1 is a random matrix (rand) but when the source is a wave file which has been made into a matrix using the Short time Fourier transform S! and S2 differ and i cannot seems to get back the original matrix S1. Anybody has any clue Why this happens?

y = wavread('source.wav');
S1= myspectrogram(y); % Generic routine to get the STFT
[U S V]=svd(S1);
S2= U*S*(V');

If anybody has any clue plz reply. Thanks for looking.

Help generare grafic

Tue, 17 Nov 2009 12:36:40 -0700

As avea nevoie de ajutor referitor la realizarea unui grafic in matlab. Va atasez graficul si cerintele sunt urmatoarele:
Semnalul modulator va fi situat în banda . 0,1-1khz . şi va avea spectrul de forma din figura. Frecvenţa de eşantionare, Fs, va fi de. 50khz. Frecvenţa purtătoarei va fi de 0,1*Fs. Perioada de timp în care se prelevează eşantioane va fi aleasă astfel încât sa cuprindă minim 2 perioade din fiecare componentă spectrală a semnalului modulator.Ideea e ca se porneste de la un fisier pe care vi-l scriu mai jos.As fi recunoscatoare daca ar stii careva cum pot sa obtin graficul ,pornind de la fisier. Va multumesc mult:)

“analog.m”:

clear all
Fs = 100; % Frecventa de esantionare
Fc=10; % Frecventa purtatoarei
t = [0:1/Fs:10]'; % perioada de timp in care se preleveaza esantioane
x = sin(2*pi*t); % semnalul modulator
figure(1);
subplot(3,1,1);
plot(t,x); % reprezentarea grafica a semnalului x(t)
title('Semnal modulator');
xlabel('Timp');
ylabel('Amplitudine');
spectrux = fft(x);
spectrux = abs(spectrux(1:length(spectrux)/2+1));
freq = ([0:length(spectrux)-1]/length(spectrux))*Fs/2;
figure(2);
subplot(3,1,1);
plot(freq,spectrux); % reprezentarea grafica a spectrului semnalului x(t)
title('Spectrul semnalului modulator');
xlabel('Frecventa');
ylabel('Amplitudine');

Attachment: grafic.bmp (158118 bytes | downloaded 2 times)

Help generare grafic

Tue, 17 Nov 2009 12:34:57 -0700

while loop homework problem

Mon, 16 Nov 2009 14:22:33 -0700

"One interesting property of a Fibonacci sequence is that the ratio of the values of adjacent members of the sequence approach a number called “the golden ratio” or PHI. Create a program that accepts the first two numbers of a Fibonacci sequence as a user input and then calculates additional values in the sequence until the ratio of adjacent values converges to within 0.001. You can do this in a WHILE loop by comparing the ratio of element k to element k-1 and the ratio of element k-1 to element k-2. If you call your sequence x, then the code for the WHILE statement is

while abs(x(k)/x(k-1) – x(k-1)/x(k-2))>0.001"

the first part of the code is:
x(1)=input('Enter the first starting value for your Fibonacci: ')
x(2)=input('Enter the second starting value for your Fibonacci: ')

^^^but idk how to complete the rest with the WHILE loop

i need to calculate how many terms [k] are needed to get an error within 0.001 units but im clueless...thanx in advance for any help guys

[deleted]

Mon, 16 Nov 2009 13:28:43 -0700

[this thread is deleted]

Need Import/Export Help in Matlab!!

Sun, 15 Nov 2009 23:37:32 -0700

Hi guys:
I want to import several txt files into Matlab and export the results(parameters) as several excel files(in one is prefer if possible) after Matlab execuation. Is it possible to do this in Matlab?
Thanks in advance!!

Regards,

Would you like to Share Algorithms software of Image Processing?

Fri, 13 Nov 2009 20:30:42 -0700

Hi, MATLAB`ers
My Name : Tibyani, man, 40 years old, a Ph.D Student Grad. IPS, Waseda University. in image Processing.

Now, I am studying about feature extraction and pattern matching,

Do you have sourcecode MATLAB : Modified Dynamic Programming, Geometrical Features, Hu Invariant Moment, Countur Moment, Curvature Scale Space, Modified Fourier Descriptor ?

if, OK, Please share that algorithms to me !

Best Regards
Tibyani

bioinformatics toolbox- command from turoial won't work

Fri, 13 Nov 2009 14:27:57 -0700

I am trying to do an HMM alignment, and I am talking the commands straight out of the tutorial, and I am getting errors. It is funny, because I can do other tutorials, its not like the whole thing is broken.
This is what happens:

hmmmodel = gethmmprof('PF00002')

is the command.

error:
??? Error using ==> pfamhmmread at 70
Input is not a valid PFAM file.

Error in ==> getsangerdata at 180
out = pfamhmmread(s);

Error in ==> gethmmprof at 82
model = getsangerdata(accessnum,'database','hmm',varargin{ :});

Does anyone know what is going on?
Thanks.
Mark

bioinformatics toolbox- command from turoial won't work

Fri, 13 Nov 2009 14:26:09 -0700

Image Segmentation Using Matlab

Thu, 12 Nov 2009 21:18:15 -0700

Hello,
I m a computer science student and i m working on a project on matlab and currently im stuck in a problem.The problem is that i want to

extract head from this image without using imcrop command meaning that it should automatically search and detect the head(keeping this as the

basic or common shape of the head) and extract the head from the background.Assuming the shape of the head to be like that for every image

but "the size may vary".
Here is my sample image for the head shape
http://img226.imagevenue.com/img.php?image=80992_4_122_64lo.jpg

I would really appreciate your help,suggestions,references and support
or a sample code/demo on a matlab would be nice

Image Segmentation Using Matlab

Thu, 12 Nov 2009 21:15:14 -0700

MRD file

Thu, 12 Nov 2009 06:38:25 -0700

Hi,
Can you please help me in extracting a MRD file and get the information from it to a microsoft excel file.

Regards,
Sailaja.

Evaluate Function using vectors

Wed, 04 Nov 2009 18:28:07 -0700

How would I evaluate this using a row vector? (pref no loops! (its horrible!)
function [y, err] = arctanseries(x,n) -> x is the row vector, n is just an integer.

Thank you in advance to all who try!


function [y, err] = arctanseries(x,n)

if(x>=(-1))&(x<=1)
    power = [];
    nom = [];
    denom = [];
    neg = [];
    answer = [];
    
    % Vector neg, alternating values, 1 -1 1 -1 for arctanseries
    neg = ones(1,n);
    neg(2:2:end) = -1;
    
    % Vector power, starts at 1, increases by 2 for n-1 times
    power = 1:2:((2*n)-1);
    
    % Vector denom, denominator of the arctanseries. stats at 1
    denom = 1:2:((2*n)-1);
    
    % Vector nom, nominator equals x
    nom = (ones(1,n))*x;
    
    % solve arctan series 
    answer = nom .^ power;
    answer = answer .* neg;
    answer = sum(answer ./ denom);
    
    % ***Output***
    y = answer;
else
    err = error('Input Error: x must be between -1 and 1 inclusive')
end

Evaluate Function using vectors

Wed, 04 Nov 2009 18:25:50 -0700

How would I evaluate this using a row vector? (pref no loops! (its horrible!)
function [y, err] = arctanseries(x,n) -> x is the row vector, n is just an integer.

Thank you in advance to all who try!


function [y, err] = arctanseries(x,n)

if(x>=(-1))&(x<=1)
    power = [];
    nom = [];
    denom = [];
    neg = [];
    answer = [];
    
    % Vector neg, alternating values, 1 -1 1 -1 for arctanseries
    neg = ones(1,n);
    neg(2:2:end) = -1;
    
    % Vector power, starts at 1, increases by 2 for n-1 times
    power = 1:2:((2*n)-1);
    
    % Vector denom, denominator of the arctanseries. stats at 1
    denom = 1:2:((2*n)-1);
    
    % Vector nom, nominator equals x
    nom = (ones(1,n))*x;
    
    % solve arctan series 
    answer = nom .^ power;
    answer = answer .* neg;
    answer = sum(answer ./ denom);
    
    % ***Output***
    y = answer;
else
    err = error('Input Error: x must be between -1 and 1 inclusive')
end

Re: For Sale : Nokia N900 / Apple iPhone 3gs 32gb / Nextel i9 / i888

Mon, 02 Nov 2009 15:29:38 -0700

We have this for sell, send us an email to sulearins@hotmail.com

Re: MATLAB LOADING DATA FROM A .TXT FILE

Sat, 31 Oct 2009 17:30:51 -0700

use the parameter 'headerLines' within the textscan function.

For example:

data1 = textscan(fopen(...), '%f %f %f', 'headerLines', 6)
The '6' means to skip the first 6 lines.

Learn Matlab here!
http://www.matrixlab-examples.com

MATLAB LOADING DATA FROM A .TXT FILE

Sat, 31 Oct 2009 15:37:52 -0700

MATLAB LOADING DATA FROM A .TXT FILE?

Please I need some help with this to finish my thesis.

I tried to load the solution.txt file in MATLAB, but i have been
unable to do it because it sais that there is a format problem
with the first rows, however i only need to load the rows 6 to 9 from the file
wich have a recognazible format and can be loaded with the textread function

The solution.txt file has the following data:

OBJECTIVE FUNCTION VALUE

1) 3942307.

VARIABLE VALUE REDUCED COST
UI001 0.02 -96876.960938
UI002 0.06 359612.000000
UI003 0.01 392966.000000
UI004 0.05 392966.000000

ROW SLACK OR SURPLUS DUAL PRICES
2) 0.000000 -30.976025

I only need to load rows 6 to 9, without changing in any way the solution.txt file.
The data i need would be:

UI001 0.02 -96876.960938
UI002 0.06 359612.000000
UI003 0.01 392966.000000
UI004 0.05 392966.000000

Could someone please tell me what function can i use to load the solution.txt file
but delimited only to the rows 6 to 9?

Thank you

drawing 3D plot using multiple 2D plots

Sat, 31 Oct 2009 08:30:07 -0700

Hi, I am new learner of Matlab. I need your help urgently on drawing 3D plot using multiple 2D plots of x and y.
I have many data sets of x and y points in text file which create the non-uniform shape of two circles. Each data set gives different size of circle.
Using these multiple 2D slices, I need to create the 3D shape by stack them together in Z direction.

Can anyone help me out?

output image that I wanted is attached.

Thanks for your help!!!

How can i do parallel processing in matlab????????????

Wed, 28 Oct 2009 20:45:29 -0700

How can i do parallel processing in matlab???????

plz explain to me why this!!!!!

Tue, 27 Oct 2009 20:59:52 -0700

hi guys, good morning

guys im facing a little problem and need ur help if u dont mind

i use maple kernel function in my program, here is the code:::

maple('m:=',m_int2)

ans =

m := matrix([[119, 101, 108, 99, 111, 109, 101, 32, 116, 111, 32, 101, 108, 103, 97, 109, 97, 108, 32, 101, 110, 99, 114, 121, 112, 116, 105, 111, 110, 32, 112, 97, 114, 116]])

but when i pass result from maple kernel function to matlam platform i got this answer

mm=maple('m')

mm =

11910110809911110910103211611103210110810309710909 71080321011100991141211121161051111100321120971141 16

as u can see guys the spaces between elements is deleted and answer looks like one number.....

do u know why this happened???!!!!

is there anyway 2 return answer back as it was inside maple kernel function???!!! i hope yes and u can help me guys

thank u very much

waiting 4 ur reply

Matlab Forum RSS Feed (Replies Included)

Re: SVD inconsistency

Re: MATLAB GUI

Re: MATLAB GUI

MATLAB GUI

Subscripted assignment dimension mismatch

SVD inconsistency

Help generare grafic

Help generare grafic

*while* loop homework problem

[deleted]

Need Import/Export Help in Matlab!!

Would you like to Share Algorithms software of Image Processing?

bioinformatics toolbox- command from turoial won't work

bioinformatics toolbox- command from turoial won't work

Image Segmentation Using Matlab

Image Segmentation Using Matlab

MRD file

Evaluate Function using vectors

Evaluate Function using vectors

Re: For Sale : Nokia N900 / Apple iPhone 3gs 32gb / Nextel i9 / i888

Re: MATLAB LOADING DATA FROM A .TXT FILE

MATLAB LOADING DATA FROM A .TXT FILE

drawing 3D plot using multiple 2D plots

How can i do parallel processing in matlab????????????

plz explain to me why this!!!!!

while loop homework problem