0000573: Wrong result for Jacobian elliptic function 'Dn'

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Severity

Reproducibility

Date Submitted

Last Update

0000573

[ALGLIB] Spec.functions

major

always

2013-10-21 15:33

2018-01-02 17:22

Reporter

higuerap

View Status

public

Assigned To

SergeyB

Priority

normal

Resolution

open

Platform

Status

assigned

Projection

none

OS Version

ETA

none

Fixed in Version

Product Version

Target Version

Product Build

Summary

0000573: Wrong result for Jacobian elliptic function 'Dn'

Description

Going for:

alglib::jacobianellipticfunctions(u, m, sn, cn, dn, ph);

with: u = -13.3077 and m = 0.9162 yields:

sn alglib -1
cn alglib 3.06162e-16
dn alglib 0.147015

Sn and Cn are correct, while Dn, which should be sqrt(1-m*sn*sn) is 0.147015 instead of the expected 0.289482

Steps To Reproduce

Additional Information

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Unspecified

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Issue History
Date Modified	Username	Field	Change
2013-10-21 15:33	higuerap	New Issue
2013-10-21 15:33	higuerap	Programming language	=> Unspecified
2018-01-02 17:22	SergeyB	Status	new => assigned
2018-01-02 17:22	SergeyB	Assigned To	=> SergeyB

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