Octave Basics: Difference between revisions
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=== Vectors and matrices === | === Vectors and matrices === | ||
<code>:</code> , <code>.*</code> , <code>./</code> , <code>.^</code> , <code>'</code> , <code>.'</code> , <code>\</code> , {{manual|length}} , {{manual|numel}} , {{manual|size}} , {{manual|zeros}} , {{manual|ones}} , {{manual|eye}} , {{manual|diag}} , {{manual|rand}} , {{manual|det}} , {{manual|trace}} , {{manual|inv}} , {{manual|lu}} , {{manual|eig}} , {{manual|cond}} , {{manual|expm}} | |||
x = 1:5, x(:), x(2:4), A = [11 12; 21, 22], A(1,1:end) ↵ | x = 1:5, x(:), x(2:4), A = [11 12; 21, 22], A(1,1:end) ↵ | ||
Revision as of 17:22, 14 June 2019
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) end end ↵