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Re: Function definition
*To*: mathgroup at smc.vnet.net
*Subject*: [mg15763] Re: Function definition
*From*: "Stephen P Luttrell" <luttrell at signal.dra.hmg.gb>
*Date*: Sun, 7 Feb 1999 02:03:46 -0500 (EST)
*Organization*: Defence Evaluation and Research Agency
*References*: <79ea4l$9hm@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
>I need to define a function f(theta,phi) as
>
>f(theta,phi) = f1 if 0 <= theta <= theta0, 0 <= phi <= phi0 f(theta,phi)
>= f2 otherwise
>
>where theta, phi are spherical polar coordinates, <= is less than or
>equal to and theta0 and phi0 are constants.
Assuming that all the variables have numerical values, this function
definition should do what you want:
f[theta_,phi_]:=f1/;0<=theta<=theta0 && 0<=phi<=phi0 f[theta_,phi_]:=f2
The first line applies only when the condition 0<=theta<=theta0 &&
0<=phi<=phi0 holds, and the second line applies otherwise.
Stephen P Luttrell
Signal Processing and Imagery Department DERA Malvern, St.Andrew's Road
Malvern, United Kingdom, WR14 3PS
+44 (0)1684 894046 (tel)
+44 (0)1684 894384 (fax)
luttrell at signal.dera.gov.uk (email)
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