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From: DrMajorBob on 15 Dec 2008 07:48
The error message, which includes

"1304.33[cf0_,cf1_,cf2_,cf3_,cf4_,cf5_]"

tells us that npr already had a value (1304.33).

It also tells us that the tags on Real values are protected. That is, you
can't define a function called 1304.33.

Bobby

On Sun, 14 Dec 2008 06:41:01 -0600, stpatryck <stpatryck(a)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]
>



--
DrMajorBob(a)longhorns.com

From: Jean-Marc Gulliet on 15 Dec 2008 07:50
stpatryck 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]

The symbol 'npv' has already been assigned a value (a numeric value,
1304.22 in this case) so you must clear this value first.

In[6]:= ClearAll[npv]
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]


Out[8]= 371988.

Regards,
-- Jean-Marc

From: michael.p.croucher on 15 Dec 2008 07:54
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...(a)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]


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