numpy.rate
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numpy.rate(nper, pmt, pv, fv, when='end', guess=None, tol=None, maxiter=100)
[source] -
Compute the rate of interest per period.
Deprecated since version 1.18:
rate
is deprecated; for details, see NEP 32 [1]. Use the corresponding function in the numpy-financial library, https://pypi.org/project/numpy-financial.- Parameters
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nperarray_like
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Number of compounding periods
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pmtarray_like
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Payment
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pvarray_like
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Present value
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fvarray_like
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Future value
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when{{‘begin’, 1}, {‘end’, 0}}, {string, int}, optional
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When payments are due (‘begin’ (1) or ‘end’ (0))
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guessNumber, optional
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Starting guess for solving the rate of interest, default 0.1
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tolNumber, optional
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Required tolerance for the solution, default 1e-6
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maxiterint, optional
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Maximum iterations in finding the solution
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Notes
The rate of interest is computed by iteratively solving the (non-linear) equation:
fv + pv*(1+rate)**nper + pmt*(1+rate*when)/rate * ((1+rate)**nper - 1) = 0
for
rate
.References
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1
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NumPy Enhancement Proposal (NEP) 32, https://numpy.org/neps/nep-0032-remove-financial-functions.html
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2
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Wheeler, D. A., E. Rathke, and R. Weir (Eds.) (2009, May). Open Document Format for Office Applications (OpenDocument)v1.2, Part 2: Recalculated Formula (OpenFormula) Format - Annotated Version, Pre-Draft 12. Organization for the Advancement of Structured Information Standards (OASIS). Billerica, MA, USA. [ODT Document]. Available: http://www.oasis-open.org/committees/documents.php?wg_abbrev=office-formula OpenDocument-formula-20090508.odt
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Licensed under the 3-clause BSD License.
https://numpy.org/doc/1.19/reference/generated/numpy.rate.html