Re: a[n],b[n]
- To: mathgroup at smc.vnet.net
- Subject: [mg104933] Re: a[n],b[n]
- From: fd <fdimer at gmail.com>
- Date: Fri, 13 Nov 2009 05:57:43 -0500 (EST)
- References: <hdgr4b$jc5$1@smc.vnet.net>
On Nov 12, 10:21 pm, ynb <wkfkh... at yahoo.co.jp> wrote: > a[n + 1] = 1/4*(1 + Sqrt[5])*a[n] - 1/2*Sqrt[1/2*(5 - Sqrt[5])]*b[n], > b[n + 1] = 1/2*Sqrt[1/2*(5 - Sqrt[5])]*a[n] + 1/4*(1 + Sqrt[5])*b[n], > a[1] = 4, b[1] = 9. > > a[n]= > b[n]= I imagine you want to do some recursive function. In your code there are at least three mistakes 1) you should use set delayed (:=) instead of = 2)you cannot include n+1 in the function argument 3) you have to use underscore in the function argument variable A factorial function will look like this a[n_]:=n a[n-1] a[1]=1