2011/11/17 Juan Pablo Carbajal <carba...@ifi.uzh.ch>:
> Octave 3.4.3, financial 0.3.2
> octave:2> rate(30, 510.19, 10000)
> error: @pv (x, 30, 510.19, 0, "e") - 10000: no function and no method found
> error: called from:
> error: /usr/local/share/octave/3.4.3-rc0/m/optimization/fsolve.m at
> line 149, column 9
> error: /home/juanpi/octave/financial-0.3.2/rate.m at line 69, column 5
>
> You may want to move forward in the version of Octave. If you are in
> 32bits you can try out this binaries, they were successfully tested
> many times by now.
> http://ubuntuone.com/6l35Gf3j8alWL7fGeYW388
>
Juan, what do you mean by "successfully tested many times by now"? You
show an example of failure from the last Octave/financial pair. Why
should I change the version if it seams to not solve the issue?
By the way, irr() and rate() do errors because they call fsolve() with
a string as an argument. Example:
octave:3> fsolve("pv (x, 30, 510.19, 0, \"e\") - 10000",0)
error: error creating function handle "@pv (x, 30, 510.19, 0, "e") - 10000"
error: called from:
error: /usr/share/octave/3.2.4/m/optimization/fsolve.m at line 138, column 9
But with another syntax:
octave:4> fsolve(@(x)pv(x, 30, 510.19) - 10000 , 0)
ans = 0.019085 # wrong. 0.03 is correct.
octave:6> fsolve(@(x)x-1 , 0)
ans = 1.0000 # right
octave:7> fsolve(@(x)-x^2+4, 0)
warning: division by zero
warning: division by zero
.
.
.
ans = 0 # wrong, but initial value is not good.
octave:8> fsolve(@(x)-x^2+4, 0.1)
ans = 2.0000 # now right, with a good initial value.
I am new to octave and I don't know if the way to call fsolve() is an issue.
Cheers,
Júlio
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