Inverse Harmonic and Inverse Digamma Functions

09032020, 02:05 PM
(This post was last modified: 09032020 03:17 PM by Albert Chan.)
Post: #4




RE: Inverse Harmonic and Inverse Digamma Functions
Something unexpected when I try to test invPsi() accuracy.
Note: Psi(1) = euler_gamma = 0.57721566490153286 ... XCas> 1  invPsi(0.57721566490153286) → 5.55111512313e16 XCas> 1  invPsi(euler_gamma) → 1.713074127e13 ??? Above were done on XCas 1.5.063 (win32), with 12digits display float format. Raising to 17digits, expressions now agreed, error = 5.5511151231258e16 Rounding constant with changing float display format is likely a XCas bug. This bug seems to affect only euler_gamma. Example, setting float display format to 6 digits: XCas> 3.1415926535897931  float(pi) → 0.0 XCas> 0.57721566490153286  float(euler_gamma) → 0.470199e6 ??? 

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Messages In This Thread 
Inverse Harmonic and Inverse Digamma Functions  Albert Chan  09012020, 09:06 PM
RE: Inverse Harmonic and Inverse Digamma Functions  Albert Chan  09022020, 11:03 AM
RE: Inverse Harmonic and Inverse Digamma Functions  Albert Chan  10302020, 09:57 PM
RE: Inverse Harmonic and Inverse Digamma Functions  Albert Chan  09022020, 07:48 PM
RE: Inverse Harmonic and Inverse Digamma Functions  Albert Chan  09032020 02:05 PM

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