Differences

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--- octave:octave [2008/08/06 15:45] – deva
+++ octave:octave [2009/04/23 13:54] (current) – deva
@@ Line 1: / Line 1: @@
 =====Octave syntax and library overview=====
+====Installing packages====
+Fetch the package files from [[http://octave.sourceforge.net/|octaveforge]].
+Then create (or add to) the file ~/.octaverc the following content:
+<code matlab>
+addpath(genpath('~/octave'))
+</code>
+And run ''pkg install packagename-1.0.0.tar.gz'' or whatever the package is called from inside octave.
+Now the package should be available.
+====plotting====
+<code matlab>
+h = [1,2,3,4,5];
+plot(h);
+xlabel("some numbers");
+print("myfile.pdf", "-dpdf");
+</code>
+This code plots a a vector with a label on the x-axis, and exports it to a pdf file.
+<code matlab>
+h=wavread('h.wav');
+hfft=abs(fft(h));
+semilogx(hfft(1:end/2))
+</code>
+This code loads an audiofile, and plots its frequency spectrum on a logartihmical scale.
 ====function====
@@ Line 7: / Line 31: @@
 end;
 </code>
+====strings====
+<code matlab>
+mystring = 'hello world'; % create string
+sizeof(mystring) % get length of string
+mystrilyng2 = [ mystring, 'fisk']; % concatenate two strings
+</code>
+sizeof on works in octave. in matlab the length of a string cannot be obtained!
 ====string array====
 <code matlab>
-myarray = { 'hello', 'world' };
+myemptyarray = {}; % create empty string array.
+myarray = { 'hello', 'world' }; % create array with two strings.
+myarray(1) % prints 'hello'
+myarray(3) = 'blah'; %inserts another string into the array.
+sizeof(myarray) % get number of elements
+sizeof(myarray(1)) %get length of first string
+% Iterate strings in string array
+for str = myarray
+  disp(str)
+end
 </code>
+Note: Arrays are 1-based, not 0-based as they usually are in real programming languages.
+Note: sizeof is an octave-only function. size can be used to get the array size in matlab.
 ====if then else====