Category Archives: Newton

More 3D Intersections and 3D plotting function

Posted on 28/03/2011 by dougaj4

Following the previous post, I have added several new functions connected with intersections of lines and planes, and a function to generate a perspective plot from 3D coordinates.  The new functions have been added to the IP2.xls worksheet, which can … Continue reading →

Posted in Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 7 Comments

3D Intersections

Posted on 19/03/2011 by dougaj4

Following a discussion at the Eng-Tips Forum, I have written an Excel User Defined Function (UDF) to find the intersection point of two 3D line segments.  The UDF has been added to the IP2 spreadsheet, which is available for free … Continue reading →

Posted in Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , | 7 Comments

Laterally Loaded Piles and a Safety Device for Walking on Icy Pavements

Posted on 19/03/2011 by dougaj4

What do laterally loaded piles: and a safety device for walking on icy pavements: have in common? Apart from their obvious utility, both are the subject of learned papers, freely available at the Virginia Tech Digital Library and Archives, along … Continue reading →

Posted in Geotechnical Engineering, Newton | Tagged , | Leave a comment

XNumbers and Tropical Events

Posted on 10/03/2011 by dougaj4

My on-line friend Al Vachris recently sent me a link to the Tropical Events site, which features a detailed analysis of the orbital motion of the Earth and the other bodies of the solar system, all done in Excel, and … Continue reading →

Posted in Excel, Maths, Newton, Numerical integration | Tagged , , , | 16 Comments

Double Exponential Quadrature

Posted on 07/03/2011 by dougaj4

Graeme Dennes has updated his Tanh-Sinh Quadrature spreadsheet to include Double Exponential Quadrature.  His brief notes are given below, and more details and links to background information are included in the download file. ================================================================= Double Exponential Quadrature UDFs added to Tanh-Sinh Quadrature … Continue reading →

Posted in Excel, Maths, Newton, Numerical integration, UDFs, VBA | Tagged , , , , , | 1 Comment