| QMAP | |
Quadratic data mapping.
Synopsis:
Y = qmap(X)
out_data = qmap(in_data)
Description:
Y = qmap(X) mapps input n-dimensional data X into a new
(n*(n+3)/2)-dimensional space using the quadratic mapping. An
input vector x=X(:,i) is mapped to its image y=Y(:,i) such that
y = [x(1) ;x(2) ;...;x(n);
x(1)*x(1);x(1)*x(2);...;x(1)*x(n);
x(2)*x(2);...;x(2)*x(n);
...
x(n)*x(n)]
out_data = qmap(in_data) use to map labeled data such that
out_data.X = qmap(in_data.X)
out_data.y = in_data.y
Example:
orig_data = load('vltava');
map_data = qmap(orig_data);
lin_model = perceptron(map_data);
quad_model = lin2quad(lin_model);
figure; ppatterns(orig_data);
pboundary(quad_model);
See also
LIN2QUAD, QUADCLASS.
(c) Statistical Pattern Recognition Toolbox, (C) 1999-2003,
Written by Vojtech Franc and Vaclav Hlavac,
Czech Technical University Prague,
Faculty of Electrical engineering,
Center for Machine Perception
Modifications:
17-may-2004, VF
22-Oct-2003, VF
26-June-2001, V.Franc, comments repared.
24. 6.00 V. Hlavac, comments polished.