xarrows - draw a set of arrows

Calling Sequence

xarrows(nx,ny,[arsize,style])

Parameters

• nx,ny : real vectors or matrices of same size.
• arsize : real scalar, size of the arrow head. The default value can be obtained by setting arsize to -1.
• style : matrix or scalar. If style is a positive scalar it gives the color to use for all arrows. If it is a negative scalar then the current color is used. If it is a vector style(i) gives the color to use for arrow i.

Description

xarrows draws a set of arrows given by nx and ny. If nx and ny are vectors, the ith arrow is defined by (nx(i),ny(i))-->(nx(i+1),ny(i+1)). If nx and ny are matrices:

nx=[xi_1 x1_2 ...; xf_1 xf_2 ...]
ny=[yi_1 y1_2 ...; yf_1 yf_2 ...]
   

the k th arrow is defined by (xi_k,yi_k)-->(xf_k,yf_k).

xarrows uses the current graphics scale which can be set by calling a high level drawing function such as plot2d.

Examples

x=2*%pi*(0:9)/8;
x1=[sin(x);9*sin(x)];
y1=[cos(x);9*cos(x)];
plot2d([-10,10],[-10,10],[-1,-1],"022")
xset("clipgrf")
xarrows(x1,y1,1,1:10)
xset("clipoff")
 

Author

J.Ph.C.