In case you don’t know the exact number of columns or rows you can use the magic “end” index, e.g.: mymatrix(:,2:end) % all but first column mymatrix(2:end,:) % all but first row This also allows you to slice rows or columns out of a matrix without having to reassign it to a new variable.
You can use vectorize of operations in Octave/Matlab. Iterate over entire vector – it is really bad idea, if your programm language let you vectorize operations. R, Octave, Matlab, Python (numpy) allow this operation. For example, you can get scalar production, if theta = (t0, t1, t2, t3) and X = (x0, x1, x2, x3) … Read more
An easy inline way to do this is: b = [ones(size(b, 1), 1) b];
setenv(“GNUTERM”,”qt”) in your octave command prompt, it should solve the problem.
Using the built-in profiler to see where the hot parts of my code are: profile on % some lines of code profile off profile viewer or just using the built in tic and toc to get quick timings: tic; % some lines of code toc;
The problem is likely to be the graphics toolkit which your installation of Octave is using. To check this, type graphics_toolkit in the Octave command line. If the response is fltk and your plot window is freezing, then switch the default toolkit to gnuplot: graphics_toolkit(‘gnuplot’) Test that the problem is fixed: x=1:10; y=x.^2; plot(x,y) Make … Read more
x(end+1) = newElem is a bit more robust. x = [x newElem] will only work if x is a row-vector, if it is a column vector x = [x; newElem] should be used. x(end+1) = newElem, however, works for both row- and column-vectors. In general though, growing vectors should be avoided. If you do this … Read more
You can concatenate strings using strcat. If you plan on concatenating numbers as strings, you must first use num2str to convert the numbers to strings. Also, strings can’t be stored in a vector or matrix, so f must be defined as a cell array, and must be indexed using { and } (instead of normal … Read more
In 2008 I tried doing the same thing. I quickly noticed the following show stoppers: Toolboxes are not as complete and not as well tested. Particularly the image processing toolbox that my work relied heavily upon (the big show stopper was that imtransform was not implemented). The Octave debugger and profiler were primitive compared to … Read more
I was trying to figure this out as well, 2 years later. But I got my answers; hopefully it’ll help someone. You need 2 audio recordings. You can get audio examples from http://research.ics.aalto.fi/ica/cocktail/cocktail_en.cgi. reference for implementation is http://www.cs.nyu.edu/~roweis/kica.html ok, here’s code – [x1, Fs1] = audioread(‘mix1.wav’); [x2, Fs2] = audioread(‘mix2.wav’); xx = [x1, x2]’; yy … Read more