Graph of X*Sin(X) incorrect HP50g
09-28-2017, 01:59 PM
Post: #1
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
Graph of X*Sin(X) incorrect HP50g
Graphing the function X times Sin(X) displays a Horizontal Asymptote at positive 1.
I am in radian mode using RPN.

Can anyone tell me how to display the correct graph?

Cheers!
09-28-2017, 03:48 PM
Post: #2
 Brad Barton Member Posts: 189 Joined: Jan 2014
RE: Graph of X*Sin(X) incorrect HP50g
Works correctly on my 50g. Did you clear the previous graph before you plotted x*sin(x)?

09-29-2017, 04:31 PM
Post: #3
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
RE: Graph of X*Sin(X) incorrect HP50g
My Bad. I meant to use X times SIN(1/X).
Cheers!
09-29-2017, 05:58 PM (This post was last modified: 09-29-2017 05:59 PM by Dieter.)
Post: #4
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
RE: Graph of X*Sin(1/X) is fine
(09-28-2017 01:59 PM)MullenJohn Wrote:  Graphing the function X times Sin(X) displays a Horizontal Asymptote at positive 1.
I am in radian mode using RPN.

For the record: you now said that the function is x · sin(1/x). This function indeed approachs +1 as x approaches infinity: This means that 1/x approaches zero and thus sin(1/x) ≈ 1/x so that the limit is x · 1/x = 1. So there is no problem with the 50G.

Dieter
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