octave:octave
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octave:octave [2008/08/06 15:45] – deva | octave:octave [2009/04/23 13:54] (current) – deva | ||
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=====Octave syntax and library overview===== | =====Octave syntax and library overview===== | ||
+ | ====Installing packages==== | ||
+ | Fetch the package files from [[http:// | ||
+ | Then create (or add to) the file ~/.octaverc the following content: | ||
+ | <code matlab> | ||
+ | addpath(genpath(' | ||
+ | </ | ||
+ | And run '' | ||
+ | Now the package should be available. | ||
+ | |||
+ | ====plotting==== | ||
+ | <code matlab> | ||
+ | h = [1, | ||
+ | plot(h); | ||
+ | xlabel(" | ||
+ | print(" | ||
+ | </ | ||
+ | This code plots a a vector with a label on the x-axis, and exports it to a pdf file. | ||
+ | |||
+ | <code matlab> | ||
+ | h=wavread(' | ||
+ | hfft=abs(fft(h)); | ||
+ | semilogx(hfft(1: | ||
+ | </ | ||
+ | This code loads an audiofile, and plots its frequency spectrum on a logartihmical scale. | ||
====function==== | ====function==== | ||
Line 7: | Line 31: | ||
end; | end; | ||
</ | </ | ||
+ | |||
+ | ====strings==== | ||
+ | <code matlab> | ||
+ | mystring = 'hello world'; | ||
+ | sizeof(mystring) % get length of string | ||
+ | |||
+ | mystrilyng2 = [ mystring, ' | ||
+ | |||
+ | </ | ||
+ | sizeof on works in octave. in matlab the length of a string cannot be obtained! | ||
====string array==== | ====string array==== | ||
<code matlab> | <code matlab> | ||
- | myarray = { ' | + | myemptyarray = {}; % create empty string array. |
+ | |||
+ | myarray = { ' | ||
+ | myarray(1) % prints ' | ||
+ | myarray(3) = ' | ||
+ | |||
+ | 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 | ||
</ | </ | ||
+ | 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==== | ====if then else==== |
octave/octave.1218030312.txt.gz · Last modified: 2008/08/06 15:45 by deva