Multiplying by output of small polynomial coefficients on vi trendline and get unexpected results

I'd appreciate it if someone could shine any light on this problem for me.

I'm performing a polynomial regression with the VI express Curve Fitting.  The express VI itself works very well.  I used the polynomials it generates for the graph of a function in Excel and it looks perfect.

When I convert the signal to an array and then multiply by other values things start to go south.

The results of multiplications are wrong when some 'x' values are used.  The strange thing for me, is that it does not work for all values of x.

Not sure if this is useful, but the expected values for x 0 through x 5 (bottom right, below) are:

x 0:-1,14

x 1: 16.11

x 2:6-3-19

x 3:-3.39E - 4

x 4: 6.76E - 7

X 5:-2.08e - 7

and the values displayed when the routine is running:

x 0:-1,14

x 1: 16.11

x 2: 25.57

x 3:-925.06

x 4: 104.25

x 5:-2017.87

Any ideas?  I think a data type must be changed since the expected values are very small and the problem is only present for certain values of x.

If this is the case I don't know how to change the data type.  The table contains double the conversion of the shape of the signal.

Thanks for any help,

Dave

Hi TCPlomp,

I just realized that I had x and is reversed in my entries "power x" function.

Thanks for letting me know about polynomial screws.  Add those who should be more pleasant than to try to clean it.

Kind regards

Dave

Tags: NI Software

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