Category Archives: Maths

Solving non-linear equations with two or more unknowns – 3

Posted on 08/10/2015 by dougaj4

For the next stage of the non-linear solver saga I am looking at the same problem as in the previous post (finding the curvature or a reinforced concrete section under specified bending moment and axial load), but with more realistic … Continue reading →

Posted in Beam Bending, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 1 Comment

Solving non-linear equations with two or more unknowns – 2

Posted on 03/10/2015 by dougaj4

The previous post presented a simple but slow procedure for solving non-linear equations with two unknowns.  In this post I will describe a much faster method, that also has the advantage that it can simply be extended to work with … Continue reading →

Posted in Beam Bending, Concrete, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , | 5 Comments

Solving non-linear equations with two or more unknowns – 1

Posted on 30/09/2015 by dougaj4

Newton’s Method is a well known iterative solution for non-linear equations with one unknown.  That is, if some value Y depends on a variable X, then we can use Newton’s Method to find X for any given value of Y.  … Continue reading →

Posted in Beam Bending, Excel, Maths, Newton, UDFs, VBA | Tagged , , , , , , , | 2 Comments

IP2 and IP2_py

Posted on 11/09/2015 by dougaj4

The IP2 spreadsheet provides functions to calculate: Intersection points of 2D lines or polylines Intersection points of 2 circles, or a line and a circle Intersection circle of two spheres and intersection points of 3 spheres 3D centre point of … Continue reading →

Posted in Coordinate Geometry, Excel, Link to Python, Maths, Newton, UDFs, VBA | Tagged , , , , , , , , , , , | 5 Comments

A Loopy Link (and three more)

Posted on 23/08/2015 by dougaj4

For some reason Doug Glancy’s Excel Blog has escaped my attention up till now, but having a browse today, I discovered this loopy animation: which would not have been out of place in Douglas Hofstadter’s “I am a Strange Loop” I really … Continue reading →

Posted in Animation, Computing - general, Excel, Maths, Newton, VBA | Tagged , , , , , | 2 Comments