Define curve mathematically
Favorites|Homepage
Subscriptions | sitemap
HOME > Engineering > Define curve mathematically

Define curve mathematically

[From: ] [author: ] [Date: 11-05-12] [Hit: ]
you could use a parabola as an approximation.Put the points in two columns in excel.Make a scatterplot.Now, right click on the data and add a trendline.Select type polynomial,......
I'm drafting finger groove for a custom part for a machine shop. It's a curve that needs to be defined mathematically, both for CAD and their tooling. No, we can't do two straight lines. It needs to match a line that passes through the points:

(0 , 0.08625) --> (0.4375 , 0) --> (1.0625 , 0.0625)

I'd be grateful if someone could show me how to create a math formula for this.

-
There are infinitely many curves that could do this.


If you want the easiest answer, you could use a parabola as an approximation.


Put the points in two columns in excel. Make a scatterplot.


Now, right click on the data and add a trendline. Select type polynomial, and enter 2 for order. Make sure the display equation on chart box is checked.



Alternatively, a circle arc could also fit the three points, but it is an algebra nightmare to even begin to attempt. Unless you see a pattern immediately.

-
Use y = ax^2 +bx + c

plug in each of your (x,y) values and get an equation in a, b, and c for each point.

solve the three equations for the values of a, b, and c
1
keywords: mathematically,curve,Define,Define curve mathematically
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .