HP49-50G Lambert function
10-20-2020, 10:44 PM
Post: #10
 Gil Senior Member Posts: 391 Joined: Oct 2019
RE: HP49-50G Lambert function
Thanks for the detailed explanation.

For negative numbers, I get the same complex numbers as when using Wolfram Alpha, and that up to -190.
Beyond that number, I get different — but possible, correct — results.

My program
W(-190.,0.): (3.73813626409,-2.54403205829)
= result given by Wolfram.

But
W(-191.,0.): (3.0807478,-8.212851).
not equal W(-191_Wolfram ): (3.742525,2.544493).

Strange?

Could you have a check in your program for w(-191 + 0i)?

Thanks and regards.

By the way, when solving for
x^2 = 2 ^x,
I find only 2 real solutions : -. 766 and 2; no way to find by calculus the missing real solution x=4.

Could you help me?

Regards,
Gil Campart
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 Messages In This Thread HP49-50G Lambert function - Gil - 10-17-2020, 08:42 PM RE: HP49-50G Lambert function - Gil - 10-18-2020, 10:22 AM RE: HP49-50G Lambert function W(z) - Gil - 10-19-2020, 09:06 AM RE: HP49-50G Lambert function - Gil - 10-19-2020, 09:13 AM RE: HP49-50G Lambert function - Albert Chan - 10-20-2020, 01:48 AM RE: HP49-50G Lambert function - Gil - 10-19-2020, 09:40 AM RE: HP49-50G Lambert function - Gil - 10-20-2020, 08:28 AM RE: HP49-50G Lambert function - Gil - 10-20-2020, 08:42 AM RE: HP49-50G Lambert function - Albert Chan - 10-20-2020, 04:40 PM RE: HP49-50G Lambert function - Gil - 10-20-2020 10:44 PM RE: HP49-50G Lambert function - Albert Chan - 10-21-2020, 02:54 AM RE: HP49-50G Lambert function - Albert Chan - 10-21-2020, 12:13 PM RE: HP49-50G Lambert function - Gil - 10-21-2020, 11:44 AM