File: mtlb_diff.cat

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mtlb_diff(2)                   Scilab Function                   mtlb_diff(2)
NAME
  mtlb_diff - Difference and approximate derivative

  Author: Paulo Goncalves

  Difference and approximate derivative. If x is a matrix, the differences
  are computed columnwise.

Usage

  [y] = mtlb_diff(x[,order])
Input parameters
       o x : real valued vector or matrix [rx,cx]
       o order : positive integer specifying the difference order. Default
         value is order = 1.
Output parameters
       o y : real valued vector or matrix [rx-order,cx] y = x(order+1:rx,:) -
         x(1:rx-order,:) ;
See also:

Example:
   Matrix synthesis:

  N = 100 ;
  t = 0:N-1 ;
  x = sin(2*%pi*0.05*t) ;

   approximate 1-st order derivative

  y = mtlb_diff(x) ;
  plot2d([t(:) t(:)] , [x(:) [y(:);0]]) ;