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 Elementary matrices and matrix manipulation.
 Copyright (c) 1984-93 by The MathWorks, Inc.

 Elementary matrices.
   zeros       - Zeros matrix.
   ones        - Ones matrix.
   eye         - Identity matrix.
   rand        - Uniformly distributed random numbers.
   randn       - Normally distributed random numbers.
   linspace    - Linearly spaced vector.
   logspace    - Logarithmically spaced vector.
   meshgrid    - X and Y arrays for 3-D plots.
   :           - Regularly spaced vector.

 Special variables and constants.
   ans         - Most recent answer.
   eps         - Floating point relative accuracy.
   realmax     - Largest floating point number.
   realmin     - Smallest positive floating point number.
   pi          - 3.1415926535897....
   i, j        - Imaginary unit.
   inf         - Infinity.
   NaN         - Not-a-Number.
   flops       - Count of floating point operations.
   nargin      - Number of function input arguments.
   nargout     - Number of function output arguments.
   computer    - Computer type.
   isieee      - True for computers with IEEE arithmetic.
   why         - Succinct answer.
   version     - MATLAB version number.

 Time and dates.
   clock       - Wall clock.
   cputime     - Elapsed CPU time.
   date        - Calendar.
   etime       - Elapsed time function.
   tic, toc    - Stopwatch timer functions.

 Matrix manipulation.
   diag        - Create or extract diagonals.
   fliplr      - Flip matrix in the left/right direction.
   flipud      - Flip matrix in the up/down direction.
   reshape     - Change size.
   rot90       - Rotate matrix 90 degrees.
   tril        - Extract lower triangular part.
   triu        - Extract upper triangular part.
   :           - Index into matrix, rearrange matrix.