Line of Best Fit Equation

[yaymaths]

Hi,

I\'m new to autograph

sorry if this seems obvious but I\'m using the best fit function to find a model for my data set- I\'m slightly confused with this as when i use, for example order 6, the largest x thing is x^4 (ie. not 6)

also with order 7 there is what seems to be an E-(x^4)
(i originally thought E= x10^) but now i\'m not sure as every time i put the given equation as a new equation the lines are always comletely different (though they supposedly have the same equation)

any help greatly aappreciated
many thanks

[debutler]

A common problem - what is happening is the coefficients of x^5 and x^6 are so small they are being ignored.

There is an easy way round this. If you go to
 PAGE => EDIT SETTINGS
and change the SIG FIG to say 9, you will find all the terms included.

[Marcano]

Hey, I just started using autograph...
I would much appreciate help as I\'m stuck for quite a time...
I have a set of data, through which runs a polynomial of 3. But I\'m not able to find the equation for this polynomial... is there a function that would show it to me??
thanks

[Simon]

Dear Marcano,

Please could you describe the steps that you completed to create the polynomial. You should find that if you select the polynomial the equation will appear in the status bar at the bottom of the page.

Best wishes,

Simon

[tutijara]

Dear Simon,

I am trying to fit data to a function using the best fit to data feature of Autograph but I can\'t get the menu with this option. I choose both the line (in black) and the points but I don\'t get the best fit to data at the bottom as it shows in the tutorial. My function is logarithmic on both axis so the function is not described as y=f(x), but logy=f(x). Could that be the problem?
I also can\'t get the update results to show my fitted data, which I managed to fit using the tool.
Any help would be appreciated.

Quote:Dear Marcano,

Please could you describe the steps that you completed to create the polynomial. You should find that if you select the polynomial the equation will appear in the status bar at the bottom of the page.

Best wishes,

Simon

[Simon]

Dear tutijara,

You can only apply the best fit to equations of the form y = f(x). I am not sure what you mean by "I also can\'t get the update results to show my fitted data, which I managed to fit using the tool."

Kind regards,

Simon