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# coords.maple -- set up and covert between coordinates, gridfn arrays, etc
# $Header$
#
# setup_coords - set up coordinates
#
################################################################################
#
# This function sets up the coordinates.
#
setup_coords :=
proc()
global
@include "../maple/coords.minc";
N := 3; # number of spatial coordinates,
# i.e. spatial coordinate indices
# are 1..N
N_ang := 2; # number of angular spatial coordinates
# Kronecker delta
delta := array(1..N, 1..N, identity);
# (x,y,z) coordinates
# n.b. individual coordinates are (xx,yy,zz) to avoid confusion with
# local variables x, y, etc
x_xyz := array(1..N);
x_xyz[1] := xx;
x_xyz[2] := yy;
x_xyz[3] := zz;
x_xyz_list := [xx, yy, zz];
x_xyz_set := {xx, yy, zz};
# r coordinate
r__fnd := ssqrt(xx^2 + yy^2 + zz^2);
# (rho,sigma) coordinates
y_rs := array(1..N_ang);
y_rs[1] := rho;
y_rs[2] := sigma;
y_rs_list := [rho, sigma];
y_rs_set := {rho, sigma};
# list of all coordinates (for sorting things into "nice" order)
xy_all_list := [op(x_xyz_list), op(y_rs_list)];
xy_all_set := {op(xy_all_list)};
NULL;
end proc;
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