Important/useful Matlab commands/functions
    (do examples on Matlab!)

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arrays
  x = zeros( 1 , N );   x = ones( 1, N );
  x = rand( 1 , N );   x = randi( [5, 45], 1, N );

  s = sort(x);
  Sum = sum( x );   [Min, iMin] = min( x );   [Max, iMax] = max( x );
  write Matlab function 'myMin(x)' using loop,if, to do what 'min(x)' does

But on a matrix A, these act column-wise, e.g.
  Sum = sum( A ) = array of column sums = [ sum(A(:,1))   sum(A(:,2))   ... sum(A(:,N)) ]
  To find sum of all entries of a matrix A, can use: Sum = sum( A(:) );  
  For an M×N matrix A, A(:) = columns of A stacked in one column ( MN×1 column array )

Grid points
  x = linspace( a , b, M+1 ) for M subintervals, each of width dx=(b-a)/M
  x = a : dx : b ;

I/O
  a = input( 'enter a: ' )   for numerical input
  word = input( 'enter word: ', 's' )   for string input
  fprintf(' ... formating ... \n', vars )   prints on ONE line, \n for new line

plotting :   ( note: x must be sorted! )
  plot( x , y , '-r' )   title('Title')   xlabel('x')   ylabel('y')

function m-file in a file FCN.m :
  function [ y ] = FCN( x )
    . . . ;
    y = ... ;
    . . . ;
  end %function