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See the recommended documentation of this function

# champ

2D vector field plot

### Calling Sequence

```champ(x,y,fx,fy,[arfact,rect,strf])
champ(x,y,fx,fy,<opt_args>)```

### 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))`.

<opt_args>

This represents a sequence of statements `key1=value1,key2=value2`,... where `key1`, `key2,...` can be one of the following: arfact, rect, strf (see below).

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 `champ`.

### Description

`champ` draws a 2D vector field. The length of the arrows is proportional to the intensity of the field.

If you want colored arrows with the color of the arrows depending on the intensity of the field, use `champ1`.

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

### Examples

```// using rect as plot boundaries
champ(-5:5,-5:5,rand(11,11),rand(11,11),rect=[-10,-10,10,10],arfact=2)
// using (x,y) to get boundaries
clf()
champ(-5:5,-5:5,rand(11,11),rand(11,11),2,[-10,-10,10,10],"021")```

### Authors

J.Ph.C.

 Author : Hervé Rabs posted the 31/05/2014 00:04 About this: for example champ(x,x,Fx,Fy) and we have different arrows in the graph. where are the first component and the second component from champ(x,x,Fx,Fy) when we draw different arrows in the graph ?( How to create arrows in the graph ?) I have already looked for a forum in this site but I can't and I am sorry to write my question here. Yours faithfully, Hervé Rabs e-mail: quarantebond@yahoo.fr Reply to this comment Please login to comment this page

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