%%% loops.m: to run this script, at the matlab prompt type
%%% loops
%%% 
%%% this is an example of for and if-then-else statements:
%%% define an array filled with 15 random numbers, loop
%%% through and if value < 0.5 then set to zero, otherwise
%%% set to 1.0

echo on

ep = 15;
m = rand(15,1);

for i = 1:ep,
	if m(i) < 0.5;
	   m(i) = 0.0;
	else
	   m(i) = 1.0;
	end
end

m;


%%% Another example: Create a large random matrix, and divide by
%%% 2 until its norm is under a threshold.  Keep track of the
%%% number of iterations and display it.  The ";" at the end of 
%%% each line tells Matlab not to echo that line each time through
%%% the loop.

R = rand(4,4)*10000 * rand;

iter = 0;
while (norm(R) > .1)
  R = R / 2;
  iter = iter + 1;
end
sprintf('Number of iterations = %d', iter)

echo off