Category Archives: Newton

More on trend line equations on line charts

Posted on 27/04/2017 by dougaj4

In the previous post we saw that if a trend line equation is added to a line chart it will return the wrong coefficients if the x values are not a continuous sequence of integers, starting at 1 (click on … Continue reading →

Posted in Charts, Excel, Maths, Newton | Tagged , , , , | 1 Comment

Displaying trend line equations on line charts

Posted on 16/04/2017 by dougaj4

This post is prompted by a recent comment at Using LINEST for non-linear curve fitting which found that the trend line formula displayed on a chart was totally different from that found using the Linest function. The problem was caused by using a … Continue reading →

Posted in Charts, Charts, Excel, Maths | Tagged , , , | Leave a comment

RCInteract and RC Design Functions 7.03

Posted on 09/04/2017 by dougaj4

Since the previous post, I have updated the notes in the RC Design Functions spreadsheet to reflect the fact that with the recent update to the Bridge Design Code (AS 5100) the reinforced concrete strength design requirements for beam bending … Continue reading →

Posted in Beam Bending, Concrete, Excel, Newton, UDFs, VBA | Tagged , , , , , , , , , , | 16 Comments

RC Design Functions 7.03

Posted on 06/04/2017 by dougaj4

The latest update to my RC Design Functions spreadsheet has just been uploaded, and is available for free download (including full open-source code) from: RC Design Functions7.zip The main new feature in the latest version is a new RCInteract function, which generates an … Continue reading →

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

Indexing NumPy arrays with floats …

Posted on 01/04/2017 by dougaj4

… now you can’t. I recently updated to the latest version of NumPy (1.12.1), and today I discovered that some of my spreadsheets using NumPy arrays (via xlwings) were returning errors like: IndexError: only integers, slices (`:`), ellipsis (`…`), numpy.newaxis … Continue reading →

Posted in Arrays, Excel, Link to Python, NumPy and SciPy, UDFs, VBA | Tagged , , , , , | 2 Comments