Why do I get two different results from the same coefficients?

[altran]

I am getting two different results from the Polynomial Evaluation function.

For the first one, I am getting the coefficients from a Polynomial Fit function.  I feed the coefficients from the Fit function into the Poly Eval function and get the correct result of 12.8582 when I evaluate 49940.

For the second one, I create constant array of the SAME values that were returned from the Polynomial Fit function (i typed them in).  However, I am getting an incorrect result of -120.7913 when I feed the constant array into the Poly Eval function when I evauate 49940.

How can this happen when I am using the same array values?

Attached is an image of what I am explaining.

[GerdW · Accepted solution]

Hi Altran,

are you sure about using the "same" coefficients?

Did you compare them? Did you (atleast) set the display properties to 17 significant digits?

Please attach a VI instead of a picture...

[Ray.R]

Which version of LabVIEW are you using?

[altran]

GerdW,

Thank you, you are correct.  I set the Significant digits to 30 and it worked.  It just "looked the same" when they were both rounded to 6 sig figs.  Another lesson learned, Thanks again!!!

-Andy

[altran]

GerdW,

Thank you, you are correct.  I set the Significant digits to 30 and it worked.  It just "looked the same" when they were both rounded to 6 sig figs.  Another lesson learned, Thanks again!!!

-Andy