Octave Basics

The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

For the meaning of operators, see the GNU Octave manual.

The very basics

+ , - , * , / , ^ , pi , I , e , inf , eps , sin , cos , tan , exp , log , log10 , abs , sqrt , sign , round , ceil , floor , fix , = , , , ; , who , clear , help , lookfor

x = pi, y = floor (sin (x)), z = log (exp (2013)), z / inf

Vectors and matrices

: , .* , ./ , .^ , ' , .' , \ , length , numel , size , zeros , ones , eye , diag , rand , det , trace , inv , lu , eig , cond , expm

x = 1:5, x(:), x(2:4), A = [11 12; 21, 22], A(1,1:end)

Graphics

plot , semilogx , semilogy , loglog , contour , quiver , surf , mesh , meshgrid , xlabel , ylabel , zlabel , title , grid , axis , hold , subplot , figure , print

t = 0:0.01*pi:21*pi; x = sin (t).*(exp (cos (t)) - 2*cos (4*t) + sin (t/12).^5); y = cos (t).*(exp (cos (t)) - 2*cos (4*t) + sin (t/12).^5); plot(x, y)

Scripts and functions

@ , function , return , nargin , nargout , varargin , varargout , feval , eval

f = @(x) x.^2, f(1:10)

function v = cossum (x, n) v = cumsum (repmat (cos (x), 1, n));

Programming elements

== , > , < , >= , <= , != , | , || , & , && , ! , ~ , if , else , elseif , for , while , end , break , continue , pause

for i = 1:5 if (i < 3) disp (i) else disp (i^2) endif endfor