eval differential expressions

*To*: mathgroup at yoda.physics.unc.edu*Subject*: eval differential expressions*From*: Geoff Latham <gal at melba.bby.com.au>*Date*: Fri, 17 Jun 1994 19:12:31 +1000

Is there an easy way to evaluate differential expressions for various functions? For example, if I have D[f[x],x]^2+f[x] in Mma, I'd like to evaluate it for various functions f[x]. This can be done via naming the expression and then letting f[x_]=<desired fn of x> and typing the expressions name upon which its evaluated - but this seems awfully clumbsy! Any suggestions? Thanks.