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.TH xchange 2 "April 1993" "Scilab Group" "Scilab Function"
.so man1/sci.an
.SH NAME
xchange - coordinates transform 
.SH CALLING SEQUENCE
.nf
[x1,y1,rect]=xchange(x,y,dir)
.fi
.SH PARAMETERS
.TP 10
x,y 
: two matrices of size (n1,n2) (coordinates of a set of points)
.TP
x1,y1
: two matrices of size (n1,n2) (coordinates of the set of points )
.TP
rect
: a vector of size 4 (values in pixel of the coordinates
of the rectangle in which the scale was fixed)
.SH DESCRIPTION
After having used a graphic function, this function allows one to change real
coordinates into pixel coordinates and vice-versa, 
according to the value of the parameter \fVdir\fR.
\fVdir = 'f2i' or 'i2f'\fR ( float to int or int to float)
 \fVx1,y1\fR are the coordinates of the set of points described by \fVx,y\fR after 
the coordinate change.
.SH AUTHOR
J.Ph.C..