Matlab

My program is somewhat doing what I ask, but not to the extantI want
Mohammad wrote: Here is a simple program that does Gaussian elimination: for j=2:r, for i=j:r, mat(i,:) = mat(i,:) - mat(j-1,:)*mat(i,j-1)/mat(j-1,j-1); end end You are not doing any pivoting or column exchange or row exchange or otherwise attempting to reduce numerical errors.... 10 Aug 2010 16:54

My program is somewhat doing what I ask, but not to the extant I want
Here is a simple program that does Gaussian elimination: for j=2:r, for i=j:r, mat(i,:) = mat(i,:) - mat(j-1,:)*mat(i,j-1)/mat(j-1,j-1); end end I works, but not to the extant I want it. It considers values: 0.0204327942426589 -0.000401333398864821 0.00660003568422868 0.0085612037624541... 10 Aug 2010 16:54

Find value in second column when first column is x.
I have a matrix of two columns, the first column contains a range of numbers and so does the second column. When the value in the first column is "50", I want Matlab to output the corresponding value for that row in the second column. Can anyone please tell me the command I can use for this? Many thanks. ... 10 Aug 2010 16:54

Plotting a linear trend line using "tools", "basic fitting"
I would like to plot a linear trend line on a scatter chart. However, in the "figure" screen, I click the tools menu and then select "basic fitting" and highlight the "linear" option box. Normally a trend line appears on the graph at this stage, however, in this case I get a pop up box that says "Matrix is singular to ... 10 Aug 2010 15:48

Common help entries for sub-classes in OO
hi, I've got 1 base class, and a handful of sub-classes. These subclasses all implement a set of common functions, the functionality is different, but i'd like the help entries for all the functions to be the same. But the help entries go in the sub-class, where the implementation code is. I'd rather not cut and pas... 11 Aug 2010 11:26

Gaussian fit to histogram of image
I am trying to create a gaussian fit of data that is arranged in a histogram. The histogram was created from an MRI image (size 256x256x256), and has 124568 data points centered between 50 and 60. I do not have any statistical background, so everything i find online about Gaussian fits does not make much sense. Is ... 11 Aug 2010 11:26

need algorithm to remove mixed noise from image
Hello, i am trying to remove mixed noise(gaussian and impulsive)from image and i really need an algorithm with filters for mixed noise along with a noise detection scheme. If anyone could provide me with matlab code for such algorithm it would be a great help. I have two IEEE papers titled "A Universal Noise Remo... 10 Aug 2010 22:26

Tips to find "From" blocks without corresponding "Goto"
I'm debugging someone else code, there are a lot of "Goto" and "From" globals. By looking at the code, I realized that some "From" had some typos or inexisting corresponding "Goto"... I fixed the few I saw but I'd like to be 100% sure that there is no more missing. It would be possible to have a macro who searches ... 11 Aug 2010 02:47

Safe file mutex without race condition
> Is there a method to create a safe file mutex in Matlab? See this workaround: atomically creating a file lock in MATLAB (file mutex) http://stackoverflow.com/questions/3451343/automically-writing-a-file-in-matlab/3452143#3452143 ... 10 Aug 2010 20:14

Cell2mat issues
Hi all, The following cell2mat error is driving me nuts: ??? Error using ==> cat CAT arguments dimensions are not consistent. Error in ==> cell2mat at 89 m{n} = cat(1,c{:,n}); I have a file, input.txt, that has the names of around 4000 other files which I want to open and read. I'm using the... 10 Aug 2010 15:48