Matlab and SimuLink Development Forum

I am stuck with ssor's code. i have the following algorithm:
Enter a matrix A;
choose an initial guess x0, a maximum number of iterations N, a value for ! 2 (0; 2), and a tolerance
Tol;
_nd D, representing the diagonal, L, strictly lower triangular, and U, strictly upper triangular parts
of A;
_nd the inverse of the upper triangular matrix (D + ! U);
_nd the inverse of the lower triangular matrix (D + ! L);
set T1 = [D + ! U]1 [! L + (1 ! )D];
set T2 = [D + ! L]1 [! U + (1 ! )D];
set T = T1T2;
set c = ! (2 ! ) [D + ! U]1 [D + ! L]1 b;
set k = 0;
while k _ N;
set x(k+1) = T x(k) + c;
if jjx(k+1) x(k)jj1 _ Tol, then k = N + 1;
end;
Display x(k+1).
 
can someone show me how to code this please. thanks

I am working on an project on digital watermarking and am implementing an algorithm where de input img is mixed with de matermark img at de source to give 2 shadows.....at de destination de the 2 shadows are to re-permuted to get back de original img and the watermark img...de code is as follows


I=imread('monkey.gif');
L=imread('lenna.bmp');


SA=mod((5*I+4*L),256);
SB=mod((4*I+5*L),256);
In=mod((285*SA-228*SB),256);
Ln=mod((285*SB-228*SA),256);


the code works perfectly for smaller matrices (say 2x2) but when i use images, the variables 'In and Ln' always have zeros....I am using 512x512 images...anybody got a clue ?

Hello All,


I am seeking aid in a small project of mine. I want to identify some text in a small image, the text is located in a circular object. I have processed the image to pull out the edge of the circular region. So the steps I want to do are as such:


Process Image until a circular contour is in it.
Identify (ie. automatically draw a box around) the complete circular contours.
Then, from that selection, use it to extrude that particular section from the original image.


I am at the first step in my endeavor, and am seeking help to automatically select the region soley enclosed by the circular lines in the binary image.


I was wondering if someone could point me to some small tutorials or guides that may help me to figure out how to accomplish these automatic things. Or if possible, how to do one or two of these things.  I appreciate any and all aid, if I need to be more clear on a particular point, please let me know.

Hello
 i have a lot of Excel files and i need put all of these files in one Excel file
 i want use function xlsread('filename')
 the filenames are
 u 0.1 - u 0.2 - u 0.3 andd ....
 i want write a code that read first file from folder and put the array in on matrix and the read next file in a Loop
 i write a code like below
 --------
 j=0.1
 for i=1:10
 str=num2str(j);
 [num,titl,sub]=xlsread('u str')
 j=j+0.1;
 A(:,i)=num;
 end
 ---------

Hi all,

I am new in matlab and I am trying to create a simple ARMA(q,p) model which will predict a value 1 day ahead. I have a stock daily prices(QQQ) and my code is below.

pr=price2ret(QQQ);
model=armax(pr(1:end-150),[1 2]);
y = predict(model,pr);
plot(pr(151:end),y(151:end));

If I run this code it will give me a idpoly model(model) and a double (1x1 cell) for y variable with an Error
Error using ==> plot
Conversion to double from cell is not possible.

I will really appreciate if someone could assist me on this error and give me an insight how can I compile this error in order to be able to plot a chart with y or to compare the model with the actual report

I had tried to use the compare function but it is also give me an error.

There is a very similar example at mathworks in the following link:

http://www.mathworks.co.uk/help/toolbox/ident/ref/predict.html (http://www.mathworks.co.uk/help/toolbox/ident/ref/predict.html)

Thanks in advance