Elementary Matrices and Arrays
eye	Identity matrix
linspace	Generate linearly spaced vectors
logspace	Generate logarithmically spaced vectors
ones	Create an array of all ones
rand	Uniformly distributed random numbers and arrays
randn	Normally distributed random numbers and arrays
zeros	Create an array of all zeros
: (colon)	Regularly spaced vector
Special Variables and Constants
ans	The most recent answer
computer	Identify the computer on which MATLAB is running
eps	Floating-point relative accuracy
flops	Count floating-point operations
i	Imaginary unit
Inf	Infinity
inputname	Input argument name
j	Imaginary unit
NaN	Not-a-Number
nargin, nargout	Number of function arguments
pi	Ratio of a circle's circumference to its diameter,
realmax	Largest positive floating-point number
realmin	Smallest positive floating-point number
varargin, varargout	Pass or return variable numbers of arguments
Time and Dates
calendar	Calendar
clock	Current time as a date vector
cputime	Elapsed CPU time
date	Current date string
datenum	Serial date number
datestr	Date string format
datevec	Date components
eomday	End of month
etime	Elapsed time
now	Current date and time
tic, toc	Stopwatch timer
weekday	Day of the week
Matrix Manipulation
cat	Concatenate arrays
diag	Diagonal matrices and diagonals of a matrix
fliplr	Flip matrices left-right
flipud	Flip matrices up-down
repmat	Replicate and tile an array
reshape	Reshape array
rot90	Rotate matrix 90 degrees
tril	Lower triangular part of a matrix
triu	Upper triangular part of a matrix
: (colon)	Index into array, rearrange array