help command	Explanation and syntax for a particular command

%		Comment on that line
;		Suppress output
format long	Make Matlab print more digits

pi	3.14159265358979
exp(1)	2.71828182845905

=	Left assignment

*	Matrix multiplication
.*	elementwise multiplication
^	to the power of
.^	elementwise exponetiation	

==	Equal to
~=	Not equal to
<	Less than
>	Greater than
<=	Less than or equal to
>=	Greater than or equal to

&	And
|	Or

pwd	Present working directory
dir	List directory
cd	Change directory

tic	Start the stop watch
toc	Print the time on the stop watch

rand		Sample from Unif(0,1)
rand(n,m)	Random n by m matrix from Unif(0,1)
randn		Sample from N(0,1)
randn(n,m)	Random n by m matrix from N(0,1)

l:n	Vector from l to n, by step size 1
l:m:n	Vector from l to n, by step size m
x(i)	ith element of vector x

[1,2;3,4;5,6]	An example of a 3 by 2 matrix
A(I,J)		Submatrix of rows I and cols J
'		Transpose
A(i,:)		ith row of matrix A
A(:,i)		ith col of matrix A

zeros(n,m)	Create a n by m zero matrix
ones(n,m)	Create a n by m matrix with all entries 1
eye(n)		Create a n by n identity matrix
inv(A)		Invert square matrix A
A\b		Solves system of linear equations Ax=b for vector x
		(Never write "x = inv(A)*b"!!!)

disp('hello')			Displays hello
plot(x,y)			Plot points (x(i),y(i))
input('How old are you? ')	Prompts user for a value

why	Ask Matlab why they do what they do