# Demo entry 5988011

**Basic Operations**

Submitted by **anonymous**
on Sep 12, 2016 at 21:10

Language: Octave. Code size: 1.4 kB.

%% Change Octave prompt PS1('>> '); %% Change working directory in windows example: cd 'c:/path/to/desired/directory name' %% Note that it uses normal slashes and does not use escape characters for the empty spaces. %% elementary operations 5+6 3-2 5*8 1/2 2^6 1 == 2 % false 1 ~= 2 % true. note, not "!=" 1 && 0 1 || 0 xor(1,0) %% variable assignment a = 3; % semicolon suppresses output b = 'hi'; c = 3>=1; % Displaying them: a = pi disp(a) disp(sprintf('2 decimals: %0.2f', a)) disp(sprintf('6 decimals: %0.6f', a)) format long a format short a %% vectors and matrices A = [1 2; 3 4; 5 6] v = [1 2 3] v = [1; 2; 3] v = 1:0.1:2 % from 1 to 2, with stepsize of 0.1. Useful for plot axes v = 1:6 % from 1 to 6, assumes stepsize of 1 (row vector) C = 2*ones(2,3) % same as C = [2 2 2; 2 2 2] w = ones(1,3) % 1x3 vector of ones w = zeros(1,3) w = rand(1,3) % drawn from a uniform distribution w = randn(1,3) % drawn from a normal distribution (mean=0, var=1) w = -6 + sqrt(10)*(randn(1,10000)); % (mean = -6, var = 10) - note: add the semicolon hist(w) % plot histogram using 10 bins (default) hist(w,50) % plot histogram using 50 bins % note: if hist() crashes, try "graphics_toolkit('gnu_plot')" I = eye(4) % 4x4 identity matrix % help function help eye help rand help help

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