[email protected] wrote:
> Lovely solution, using the same idea as Devon's.
>
> As a fan of duals I rewrite it as
>
> acc2 =: 4 : '+/\&.(%&(*/\ y)) x' "1
>
> acc gives the total value at the beginning of the period.
> The other solutions assume deposit at the beginning of the period
> and give the interest at the end of the period (I think). That
> would be
>
> 2 -~/\ -/ (d,0) acc2 1 ,:~ 1 + 0,r
> 50 42 65.52 82.876 87.0198
The interest addon (formerly the interest script) has most of this
stuff, e.g.
load 'finance/interest'
r=. 0.05 0.04 0.06 0.05 0.05
d=. 1000 0 0 500 0
accpay 1;1;r;d NB. payments in arrears
1000 1040 1102.4 1657.52 1740.4
accpay 0;1;r;d NB. payments in advance
1050 1092 1157.52 1740.4 1827.42
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