# Thread: Trying to calculate non linear count value based on azimuth value

1. ## Re: Trying to calculate non linear count value based on azimuth value

This resembles calculations for latitude/longitude points, with the formulæ and code fragments for implementing them. The article is called "Calculate distance, bearing and more between Latitude/Longitude points"

2. ## Re: Trying to calculate non linear count value based on azimuth value

I am trying to use a TI-83 Plus calculator to figure out the values as can't get it working in Excel... I have entered the values as per your screenshot skeeter but when I try and run the SinReg calculation I get a SINGULAR MAT error. CubicReg calculation works fine and gives the same values as you.

Is there something else I need to set?

Tom

3. ## Re: Trying to calculate non linear count value based on azimuth value

why are you clearing lists $L_1$ and $L_2$ ... ?

4. ## Re: Trying to calculate non linear count value based on azimuth value

I'd seen that step on a tutorial... I have tried again without but still get the singular mat error...?

5. ## Re: Trying to calculate non linear count value based on azimuth value

I just did the sinusoidal regression again on my PC based TI-84 emulator ... worked fine. I don't have an 83 to test a regression. You can download a free TI-84 emulator at the attached link ...

https://wabbit.codeplex.com/

6. ## Re: Trying to calculate non linear count value based on azimuth value

Hmmm, I must be missing something. I have got the TI-84 emulator and I get the same error.

Any ideas?

8. ## Re: Trying to calculate non linear count value based on azimuth value

Originally Posted by tbow50
Any ideas?
what did you put in for the period? I used 188 since -47 to 47 is half a period, 94

9. ## Re: Trying to calculate non linear count value based on azimuth value

How do I get to that screen?

10. ## Re: Trying to calculate non linear count value based on azimuth value

it should come up after you hit the sinreg command ...

11. ## Re: Trying to calculate non linear count value based on azimuth value

Weird, I don't get that option at all. When I select it I don't get any options, just have to hit enter to run it, or not as the case may be.

13. ## Re: Trying to calculate non linear count value based on azimuth value

Yeah. When you select CALC > SinReg do you have to select the lists?

14. ## Re: Trying to calculate non linear count value based on azimuth value

Originally Posted by tbow50
Yeah. When you select CALC > SinReg do you have to select the lists?
yes, in the STAT-CALC menu, scroll to SinReg (choice C: ) and hit enter ... the SinReg menu shown in post #25 should show up. Iteration default is 3, X-list L_1, Y-list L_2, period 188, store RegEQ Y1, scroll down to Calculate ... enter.

15. ## Re: Trying to calculate non linear count value based on azimuth value

Must be a setting somewhere to enable that as I don't get that menu after selecting calc > SinReg

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