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#Curve fitting file deltagraph 7 series#
Since the "curve" in AutoCAD is a polyline it will be a series of straight line segments that have, to whatever precision you need, the shape of the curve.ĪutoCAD does not have a feature for directly entering the coefficients of an equation to generate a curve. You can then transfer those points to AutoCAD with a simple script to generate a polyline of the fit curve. Once you have determined the equation of the curve using Trendline you would then generate a series of points in Excel that reference the curve fit equation. It also gives you the coefficients of the resulting fit and a measure of how well the curve fits the data.Īssuming that you have more than 5 data points and you want to fit a 4th order polynomial, as you stated, to the data the resulting curve will not pass through every data point.
![curve fitting file deltagraph 7 curve fitting file deltagraph 7](https://cdn.aboutstatic.com/file/images/a7bf2ebdc96cd61a8967379df8412f0b.jpg)
The Excel Trendline feature does curve fitting and gives you several options for the type of curve to fit to the data including linear, polynomial, exponential and others. A 14th order polynomial can pass through 13 points but it may have a lot of ripples in it so in general it is best to use the lowest order polynomial possible when curve fitting if you want a "nice" smooth curve. For example, a straight line (order 1) can exactly pass through any 2 points, a parabola (order 2) through 3 points. To place a curve exactly though a set of data with a polynomial the order of the polynomial will usually need to be one less than the number of data points.
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The technique seeks to minimize the error between the data points and the curve (equation) that approximates the data. The objective of curve fitting is to create a curve that is a "best fit". In general, curve fitting does not generate an equation that will exactly place a curve through every data point. I am not sure how much you understand about curve fitting so please excuse me if I simplify this too much.