Re: what am i doing wrong?
- To: mathgroup at smc.vnet.net
- Subject: [mg94538] Re: what am i doing wrong?
- From: "michael.p.croucher at googlemail.com" <michael.p.croucher at googlemail.com>
- Date: Mon, 15 Dec 2008 07:54:31 -0500 (EST)
- References: <gi2usp$a53$1@smc.vnet.net>
Hi If you start a clean session and only evaluate the two lines you posted then it works just fine: npv[cf0_, cf1_, cf2_, cf3_, cf4_, cf5_] := -(cf0) + cf1*(1/((1.12)^1)) + cf2*(1/((1.12)^2)) + cf3*(1/((1.12)^3)) + cf4*(1/((1.12)^4)) + cf5*(1/((1.12)^5)); npv[3600000, 0, 0, 0, 0, 7000000] Out[1]:= 371988. So there must be something wrong with the previous 110 lines of code in your notebook. Have you defined the variable npv elsewhere? The following reproduces your error in a clean session. Note that the only difference from the working code above is that I have set npv to be 1304.33 npv = 1304.33; npv[cf0_, cf1_, cf2_, cf3_, cf4_, cf5_] := -(cf0) + cf1*(1/((1.12)^1)) + cf2*(1/((1.12)^2)) + cf3*(1/((1.12)^3)) + cf4*(1/((1.12)^4)) + cf5*(1/((1.12)^5)); npv[3600000, 0, 0, 0, 0, 7000000] During evaluation of In[1]:= SetDelayed::write: Tag Real in 1304.33 [cf0_,cf1_,cf2_,cf3_,cf4_,cf5_] is Protected. >> Out[3]= 1304.33[3600000, 0, 0, 0, 0, 7000000] Hope this helps, Mike www.walkingrandomly.com On 14 Dec, 12:40, stpatryck <stpatr... at gmail.com> wrote: > In[111]:= npv[cf0_, cf1_, cf2_, cf3_, cf4_, cf5_] := -(cf0) + > cf1*(1/((1.12)^1)) + cf2*(1/((1.12)^2)) + cf3*(1/((1.12)^3)) + > cf4*(1/((1.12)^4)) + cf5*(1/((1.12)^5)); > > (* Plan A NPV *) > npv[3600000, 0, 0, 0, 0, 7000000] > > SetDelayed::write: Tag Real in 1304.33[cf0_,cf1_,cf2_,cf3_,cf4_,cf5_] > is Protected. >> > > Out[111]:= 1304.33[3600000, 0, 0, 0, 0, 7000000]