Trigonometric regressions on hp 48?
04-11-2017, 03:20 AM
Post: #1
 thomasross Junior Member Posts: 11 Joined: Mar 2017
Trigonometric regressions on hp 48?
Hi,

Is there a program or any way to do since cosine and tangent regressions on the HP 48?
04-11-2017, 04:20 AM
Post: #2
 Eddie W. Shore Senior Member Posts: 1,448 Joined: Dec 2013
RE: Trigonometric regressions on hp 48?
Trigonometric regressions will have to be programmed on the HP 48, as they are not default regressions offered through the Stat menu.
04-14-2017, 06:07 AM
Post: #3
 thomasross Junior Member Posts: 11 Joined: Mar 2017
RE: Trigonometric regressions on hp 48?
Do you know of any programs for the HP 48 to do this?
04-14-2017, 08:06 PM
Post: #4
 Han Senior Member Posts: 1,882 Joined: Dec 2013
RE: Trigonometric regressions on hp 48?
(04-14-2017 06:07 AM)thomasross Wrote:  Do you know of any programs for the HP 48 to do this?

You can use SOLVESYS to do a regression using ANY formula (including trig formulas). The documentation for SOLVESYS even includes an example of how to do a regression.

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04-15-2017, 04:09 AM (This post was last modified: 04-15-2017 04:12 AM by thomasross.)
Post: #5
 thomasross Junior Member Posts: 11 Joined: Mar 2017
RE: Trigonometric regressions on hp 48?
(04-14-2017 08:06 PM)Han Wrote:
(04-14-2017 06:07 AM)thomasross Wrote:  Do you know of any programs for the HP 48 to do this?

You can use SOLVESYS to do a regression using ANY formula (including trig formulas). The documentation for SOLVESYS even includes an example of how to do a regression.

Thanks! Do you just need to enter how many data entries you have as the third parameter? Is there any way to do it automatically?
04-15-2017, 09:58 AM
Post: #6
 Csaba Tizedes Senior Member Posts: 581 Joined: May 2014
RE: Trigonometric regressions on hp 48?
(04-11-2017 03:20 AM)thomasross Wrote:  Hi,

Is there a program or any way to do since cosine and tangent regressions on the HP 48?

Can you post here a data and a regression function to see clearly what you needed exactly?!?

Thanks!
Csaba
04-15-2017, 11:08 AM (This post was last modified: 04-15-2017 11:09 AM by Han.)
Post: #7
 Han Senior Member Posts: 1,882 Joined: Dec 2013
RE: Trigonometric regressions on hp 48?
(04-15-2017 09:58 AM)Csaba Tizedes Wrote:
(04-11-2017 03:20 AM)thomasross Wrote:  Hi,

Is there a program or any way to do since cosine and tangent regressions on the HP 48?

Can you post here a data and a regression function to see clearly what you needed exactly?!?

Thanks!
Csaba

Here's the documentation online: http://isa.umh.es/calc/ss49docs/solve49.htm

Scroll down to "Example 3: Nonlinear least-squares" to see an example. In your case, you would simply need to change the data; you will also need to change the formula to something like: 'Y=A*COS(B*T ADD C) ADD D'

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