champ1
======

2D vector field plot with colored arrows



Calling Sequence
~~~~~~~~~~~~~~~~


::

    champ1(x,y,fx,fy,[arfact,rect,strf])




Arguments
~~~~~~~~~

:x,y two vectors which define the grid.
: :fx a matrix which describes the x component of the vector field.
  `fx(i,j)` is the x component of the vector field at point
  `(x(i),y(j))`.
: :fy a matrix which describes the y component of the vector field.
  `fy(i,j)` is the y component of the vector field at point
  `(x(i),y(j))`.
: :arfact an optional argument of type real which gives a scale factor
  for the display of the arrow heads on the plot (default value is 1.0).
: :rect a vector `rect=[xmin,ymin,xmax,ymax]` which gives the
  boundaries of the graphics frame to use.
: :frameflag controls the computation of the actual coordinate ranges
  from the minimal requested values. The associated value should be an
  integer ranging from 0 to 8.
: :axesflag specifies how the axes are drawn. The associated value
  should be an integer ranging from 0 to 5.
: :strf a string of length 3 "xyz" which has the same meaning as the
  `strf` parameter of `plot2d`. The first character x has no effect with
  `champ1`.
:



Description
~~~~~~~~~~~

`champ1` draws a 2D vector field with colored arrows. The color of the
arrows depends on the intensity of the field.

If you want arrows proportional to the intensity of the field, use
`champ`.

Enter the command `champ1()` to see a demo.



Sample
~~~~~~



Examples
~~~~~~~~


::

    champ1(-5:5,-5:5,`rand`_(11,11),`rand`_(11,11),rect=[-10,-10,10,10],arfact=2)




See Also
~~~~~~~~


+ `champ`_ 2D vector field plot
+ `fchamp`_ direction field of a 2D first order ODE
+ `plot2d`_ 2D plot


.. _champ: champ.html
.. _fchamp: fchamp.html
.. _plot2d: plot2d.html