POLYWARP question.

[Octavi Fors <octavi(at)fajnm1.am.ub.es>]

Hi everybody,

this is regarding POLYWARP function, in particular DEGREE argument. As far as I
understood by the Online Help, POLYWARP accepts the following polynomial models
depending on the value of DEGREE:

DEGREE = 0:
X_i = k_x00
Y_i = k_y00

DEGREE = 1:
X_i = k_x00 + k_x01 X_o  +  k_x10 Y_o  +  k_x11 X_oY_o

Y_i = k_y00 + k_y01 X_o  +  k_y10 Y_o  +  k_y11 X_oY_o
 

DEGREE = 2:
X_i = k_x00 + k_x01 X_o  +  k_x10 Y_o  +  k_x11 X_oY_o + k_x02X_o²+ k_x20Y_o² + k_x12 X_o² Y_o  + k_x21X_oY_o²+ k_x22 X_o² Y_o²

Y_i = k_y00 + k_y01 X_o  +  k_y10 Y_o  +  k_y11 X_oY_o + k_y02X_o²+ k_y20Y_o² + k_y12 X_o² Y_o  + k_y21X_oY_o²+ k_y22 X_o² Y_o²
 

This is fine, but poor in flexibility: what happens if I want to consider a model like this, which acounts for 1st. degree crossed XY terms and 2nd. degree in X and Y?

X_i = k_x00 + k_x01 X_o  +  k_x10 Y_o  +  k_x11 X_oY_o + k_x02X_o²+ k_x20Y_o²
Y_i = k_y00 + k_y01 X_o  +  k_y10 Y_o  +  k_y11 X_oY_o + k_y02X_o²+ k_y20Y_o²
 

Does anybody know any implementation/patch of POLYWARP which permits more freedom in considering
coeficients to obtain?
 

Thanks in advance,

Octavi.

=================================================================

Octavi Fors Aldrich

Departament d'Astronomia i Meteorologia
Facultat de Fisica
Avgda. Diagonal 647
08028 Barcelona
SPAIN

Telf: 34-934021122
Fax:  34-934021133
e-mail: octavi@fajnm1.am.ub.es

=================================================================