ipmt | R Documentation |
Calculation of annuity interest.
ipmt(irate, per, nper, pv, fv = 0, type = "immediate", silent = FALSE)
irate |
Interest rate per period (see nper) as fraction (i.e. 5% is .05 or 1/20) |
per |
period of interest |
nper |
Number of interest periods as integer (no fractions) |
pv |
Present value |
fv |
Future value (default is zero) |
type |
type of the annuity: due or immediate? |
silent |
Should warning messages be suppressed? Default is no. |
interest on annuity
builds heavily on https://gist.github.com/raadk/dcd503815bbb271484ff
ipmt(.1, 1, 1, -1000) # a single period at 10\% interest >> interest = 1/10 of principal
ipmt(.1, 1:5, 5, -1000) # see five payments of five; the amount of interest goes down
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