Scilab Function

champ1 - 2D vector field plot with colored arrows

### Calling Sequence

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

### Parameters

- `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.
- `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.

### Examples

    xset("use color",1)
    champ1(-5:5,-5:5,rand(11,11),rand(11,11),2,[-10,-10,10,10],"021")

### See Also

`champ` `fchamp` `plot2d`

### Author

J.Ph.C.