--- /dev/null
+function ss = vecscale(vector)
+
+%
+% VECSCALE: Transformation matrix for a scaling.
+%
+% Calling Sequence:
+%
+% ss = vecscale(svec)
+%
+% INPUT:
+%
+% svec : A vectors defining the scaling along the x,y and z axes.
+% i.e. [sx, sy, sy]
+%
+% OUTPUT:
+%
+% ss : Scaling Transformation Matrix
+%
+% Description:
+%
+% Returns a (4x4) Transformation matrix for scaling.
+%
+% The matrix is:
+%
+% [ sx 0 0 0]
+% [ 0 sy 0 0]
+% [ 0 0 sz 0]
+% [ 0 0 0 1]
+%
+% Example:
+%
+% Scale up the NURBS line (0.0,0.0,0.0) - (1.0,1.0,1.0) by 3 along
+% the x-axis, 2 along the y-axis and 4 along the z-axis.
+%
+% line = nrbline([0.0 0.0 0.0],[1.0 1.0 1.0]);
+% trans = vecscale([3.0 2.0 4.0]);
+% sline = nrbtform(line, trans);
+%
+% See also:
+%
+% nrbtform
+%
+% Copyright (C) 2000 Mark Spink, 2007 Daniel Claxton
+%
+% This program is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 2 of the License, or
+% (at your option) any later version.
+
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+if nargin < 1
+ error('Scaling vector not specified');
+end
+
+s = [vector(:);0;0];
+ss = [s(1) 0 0 0; 0 s(2) 0 0; 0 0 s(3) 0; 0 0 0 1];
+
+end