Re: How to use "Apply" to do differentiation ?

*To*: mathgroup at smc.vnet.net*Subject*: [mg114555] Re: How to use "Apply" to do differentiation ?*From*: Achilleas Lazarides <achilleas.lazarides at gmx.com>*Date*: Tue, 7 Dec 2010 06:48:53 -0500 (EST)

This works NestList[D[#, x] &, x^5, 5] (without {}). This is because Nest doesn't replace the Head of its second argument by its first, as Apply does. To check what you wanted to check, you could try D[#, x] &@(x^5) as opposed to D[#, x] &@@(x^5) which is what you did try. On Dec6, 2010, at 4:57 AM, Chenguang Zhang wrote: > I tried to recursively apply differentiation to a normal > distribution function, > and before using Nest command I wanted to check if pure function worked... > Now I know that I missed "{}" in my command and Apply[D[#,x]&, {x^5}] is > the correct one. Thanks to all!