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.TH xarrows 2 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
xarrows - draw a set of arrows
.SH CALLING SEQUENCE
.nf
[]=xarrows(nx,ny,[arsize,style])
.fi
.SH PARAMETERS
.TP
nx
: real matrix of size (n1,n2)
.TP
ny
: real matrix of size (n1,n2)
.TP
arsize
: real scalar (size of the arrow head). The default value can be obtained
by setting arsize to value \fV-1.0\fR.
.TP
style
: a matrix of size \fVn\fR or a scalar. If \fVstyle\fR is a positive scalar
it gives the dash style to use for all arrows, if it is a negative scalar
then current dash style is used, if it is a vector \fVstyle[i]\fR
gives the style to use for arrow \fVi\fR.
.LP
.SH DESCRIPTION
This function draws a set of arrows which are given by the vector or
matrices \fVnx\fR and \fVny\fR.
The ith arrow is defined by \fV(nx(i),ny(i))-->(nx(i+1),ny(i+1))\fR.
\fVnx, ny\fR can also be matrices :
.nf
nx=[ xi_1,x1_2,...; xf_1,xf_2,...]
ny=[ yi_1,y1_2,...; yf_1,yf_2,...]
.fi
in which case the arrows are \fV(xi_k,yi_k)->(xf_k,yf_k)\fR
.LP
This function uses the current graphic scale
which can be set by calling a high level drawing function such as \fVplot2d\fR.
.SH EXAMPLE
.nf
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')
.fi
.SH SEE ALSO
plot2d, xchange
.SH AUTHOR
J.Ph.C..
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