Something like this embed.cpp #include <iostream> #include <octave/octave.h> int main(int argc,char* argv) { int embedded; octave_main(argc,argv,embedded=0); return embedded; } Then mkoctfile embed.cpp –link-stand-alone -o embed in order to make a standalone executable. To call octave functions whether they are provided by scripts or octaveforge modules you can then use feval which takes the octave function name as … Read more
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
Solution: Create a distributable exe using mkoctfile, and package this exe with the core Octave files, and other .oct and .m files as necessary. Step 1: Create a stand-alone executable. You can see code that works here: http://www.gnu.org/software/octave/doc/interpreter/Standalone-Programs.html Particularly the file “embedded.cc”. I have simplified that file as follows: #include <iostream> #include <octave/oct.h> #include <octave/octave.h> … 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
I had to add setenv(“GNUTERM”,”X11″) to OCTAVE_HOME/share/octave/site/m/startup/octaverc (OCTAVE_HOME usually is /usr/local) to make it work permanently. Solution found and more details on: http://www.mac-forums.com/forums/os-x-apps-games/242997-plots-octave-dont-work.html
Add 1; as the first line of the file: 1; function fibo = recfibo(n) if ( n < 2 ) fibo = n; else fibo = recfibo(n-1) + recfibo(n-2); endif endfunction disp(recfibo(5)) Any M-file that starts with a function definition is a function M-file, not a script M-file. By adding a meaningless statement to the … Read more
You could use the following test to differentiate Octave from MATLAB: isOctave = exist(‘OCTAVE_VERSION’, ‘builtin’) ~= 0;
I think the sortrows function is what you’re looking for. >> sortrows(data,1) ans = -1 4 1 3 5 7
The following code explains how to generate a frequency-variable sin wave. freq1=20; %start freq freq2=200; %end freq dur=1; %duration of signal in seconds freq=@(t)freq1+(freq2-freq1)/dur*t; %another example, may help to understand the code %dur=2 %freq=@(t)heaviside(t-1)*10+heaviside(t-1.5)*-9; %Integerate over the time-local frequency, gives the average frequency until t which later on gives the sin with the right phase … Read more
Explanation of the good performance Matlab uses copy-on-write whenever possible. If you write expressions like B=A, MATLAB does not copy A, instead both variables A and B are references to the same data structure. Only if one of the two variables will be modified, MATLAB will create a copy. Now to the special case of … Read more