Tag Archives: IP2

Arcs and arc-splines

Posted on August 17, 2018 by dougaj4

I have added two user defined functions (UDFs) to the IP2 spreadsheet to generate coordinates for a single  arc, or a series of arcs connected (if necessary) by straight lines.  The new version may be downloaded from: IP2.zip As an example … Continue reading →

Posted in Animation, Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, UDFs, VBA | Tagged , , , , , , | 1 Comment

The Dome of Santa Maria del Fiore – Dimensions

Posted on June 30, 2012 by dougaj4

This post is a continuation from The Dome of Santa Maria del Fiore in Florence Different sources give a wide variety of different dimensions for the dome, but there seems to be reasonable agreement that the “across flats” diameter of the … Continue reading →

Posted in Dome Structures, Excel, Finite Element Analysis, Newton, Strand7, UDFs, VBA | Tagged , , , , , , , , | 2 Comments

Interpolation Update

Posted on June 26, 2012 by dougaj4

This post was prompted by a question at Eng-Tips.  The question was looking for ways to plot stress contours under a footing, which requires interpolation to find the depth where the stress is at the contour values, given stresses calculated … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , , , | 1 Comment

IP2 Update, ByRef and ByVal

Posted on November 8, 2011 by dougaj4

A recent comment pointed out that the IPPlaneLine function (intersection of a 3D line with a plane) in the IP2 spreadsheet was giving incorrect results.  This has now been fixed, and the corrected spreadsheet can be downloaded from IP2.zip. The problem turned out … Continue reading →

Posted in Arrays, Coordinate Geometry, Excel, Newton, UDFs, VBA | Tagged , , , , , | 1 Comment