![http://www.tutorialspoint.com/matlab/matlab_g nu_octave.htm Copyright © tutorialspoint.com
MATLAB - GNU OCTAVE TUTOIRIAL
GNU Octave is a high-levelprogramming language like MATLAB and it is mostly compatible withMATLAB. It is
also used for numericalcomputations.
Octave has the following commonfeatures withMATLAB:
matrices are fundamentaldata type
it has built-insupport for complex numbers
it has built-inmathfunctions and libraries
it supports user-defined functions
GNU Octave is also freely redistributable software. Youmay redistribute it and/or modify it under the terms of
the GNU GeneralPublic License (GPL) as published by the Free Software Foundation.
MATLAB vs Octave
Most MATLAB programs runinOctave, but some of the Octave programs may not runinMATLAB because,
Octave allows some syntax that MATLAB does not.
For example, MATLAB supports single quotes only, but Octave supports bothsingle and double quotes for
defining strings. If youare looking for a tutorialonOctave, thenkindly go throughthis tutorialfrombeginning
whichcovers bothMATLAB as wellas Octave.
Compatible Examples
Almost allthe examples covered inthis tutorialare compatible withMATLAB as wellas Octave. Let's try
following example inMATLAB and Octave whichproduces same result without any syntax changes:
This example creates a 3D surface map for the functiong = xe-(x2 + y2). Create a script file and type the following
code:
[x,y] = meshgrid(-2:.2:2);
g = x .* exp(-x.^2 - y.^2);
surf(x, y, g)
print -deps graph.eps
Whenyourunthe file, MATLAB displays the following 3-D map:](https://image.slidesharecdn.com/matlabgnuoctave-150713153232-lva1-app6892/85/Matlab-gnu-octave-1-320.jpg)
![Non-compatible Examples
Thoughallthe core functionality of MATLAB is available inOctave, there are some functionality for example,
Differential& IntegrationCalculus, whichdoes not matchexactly inboththe languages. This tutorialhas tried to
give bothtype of examples where they differed intheir syntax.
Consider following example where MATLAB and Octave make use of different functions to get the area of a
curve: f(x) = x2 cos(x) for −4 ≤ x ≤ 9. Following is MATLAB versionof the code:
f = x^2*cos(x);
ezplot(f, [-4,9])
a = int(f, -4, 9)
disp('Area: '), disp(double(a));
Whenyourunthe file, MATLAB plots the graph:
and displays the following result:
a =](https://image.slidesharecdn.com/matlabgnuoctave-150713153232-lva1-app6892/85/Matlab-gnu-octave-2-320.jpg)
![8*cos(4) + 18*cos(9) + 14*sin(4) + 79*sin(9)
Area:
0.3326
But to give area of the same curve inOctave, youwillhave to make use of symbolic package as follows:
pkg load symbolic
symbols
x = sym("x");
f = inline("x^2*cos(x)");
ezplot(f, [-4,9])
print -deps graph.eps
[a, ierror, nfneval] = quad(f, -4, 9);
display('Area: '), disp(double(a));](https://image.slidesharecdn.com/matlabgnuoctave-150713153232-lva1-app6892/85/Matlab-gnu-octave-3-320.jpg)
Matlab gnu octave
- 1. http://www.tutorialspoint.com/matlab/matlab_g nu_octave.htm Copyright © tutorialspoint.com MATLAB - GNU OCTAVE TUTOIRIAL GNU Octave is a high-levelprogramming language like MATLAB and it is mostly compatible withMATLAB. It is also used for numericalcomputations. Octave has the following commonfeatures withMATLAB: matrices are fundamentaldata type it has built-insupport for complex numbers it has built-inmathfunctions and libraries it supports user-defined functions GNU Octave is also freely redistributable software. Youmay redistribute it and/or modify it under the terms of the GNU GeneralPublic License (GPL) as published by the Free Software Foundation. MATLAB vs Octave Most MATLAB programs runinOctave, but some of the Octave programs may not runinMATLAB because, Octave allows some syntax that MATLAB does not. For example, MATLAB supports single quotes only, but Octave supports bothsingle and double quotes for defining strings. If youare looking for a tutorialonOctave, thenkindly go throughthis tutorialfrombeginning whichcovers bothMATLAB as wellas Octave. Compatible Examples Almost allthe examples covered inthis tutorialare compatible withMATLAB as wellas Octave. Let's try following example inMATLAB and Octave whichproduces same result without any syntax changes: This example creates a 3D surface map for the functiong = xe-(x2 + y2). Create a script file and type the following code: [x,y] = meshgrid(-2:.2:2); g = x .* exp(-x.^2 - y.^2); surf(x, y, g) print -deps graph.eps Whenyourunthe file, MATLAB displays the following 3-D map:
- 2. Non-compatible Examples Thoughallthe core functionality of MATLAB is available inOctave, there are some functionality for example, Differential& IntegrationCalculus, whichdoes not matchexactly inboththe languages. This tutorialhas tried to give bothtype of examples where they differed intheir syntax. Consider following example where MATLAB and Octave make use of different functions to get the area of a curve: f(x) = x2 cos(x) for −4 ≤ x ≤ 9. Following is MATLAB versionof the code: f = x^2*cos(x); ezplot(f, [-4,9]) a = int(f, -4, 9) disp('Area: '), disp(double(a)); Whenyourunthe file, MATLAB plots the graph: and displays the following result: a =
- 3. 8*cos(4) + 18*cos(9) + 14*sin(4) + 79*sin(9) Area: 0.3326 But to give area of the same curve inOctave, youwillhave to make use of symbolic package as follows: pkg load symbolic symbols x = sym("x"); f = inline("x^2*cos(x)"); ezplot(f, [-4,9]) print -deps graph.eps [a, ierror, nfneval] = quad(f, -4, 9); display('Area: '), disp(double(a));