0000573: Wrong result for Jacobian elliptic function 'Dn'

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Category

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

Status

assigned

Product Version

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

Additional Information

Programming language

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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