xarrows

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.