### Categories

### RSS Feed

### Search NewtonExcelBach

### Archives

### Top Posts

- Time in hours and minutes between two dates
- Using LINEST for non-linear curve fitting
- Solving Quadratic, Cubic, Quartic and higher order equations; examples
- Downloads
- Cubic Splines
- Weighted Least Squares Regression, using Excel, VBA, Alglib and Python
- Commenting a block of code in VBA
- Contour plots with Excel and Matplotlib
- Using Goal Seek on Multiple Cells
- The history of the theory of beam bending - Part 1

### Recent Comments

Sukrit Ghorai on Biaxial bending update dougaj4 on Biaxial bending update Sukrit on Biaxial bending update A not so easy proble… on Pint, MPmath and implied units… dougaj4 on ULS design of circular reinfor… Dakota on ULS design of circular reinfor… Marcus747 on Commenting a block of code in… dougaj4 on Biaxial bending update Sukrit on Biaxial bending update DT67 on Using ConbeamU DT67 on Using ConbeamU dougaj4 on Using ConbeamU DT67 on Using ConbeamU DT67 on Using ConbeamU dougaj4 on Biaxial bending update

# Category Archives: Drawing

## DigitGraph Spreadsheet and WebPlot Digitiser

I have posted here previously a spreadsheet that allows XY data to be extracted from images of graphs, maps or other images of objects in a single plane: How to digitise a scanned image. I have updated the instructions for the … Continue reading

Posted in Charts, Charts, Computing - general, Curve fitting, Drawing, Excel, UDFs, VBA
Tagged DigitGraph, digitize scanned image, Excel, UDF, VBA, WebPlot Digitizer
5 Comments

## Plotting Mandelbrot

There are many sites discussing the Mandelbrot Set, but not many examples using VBA to plot the set in Excel, so here is my effort: The spreadsheet (including open source VBA code) may be downloaded from: Mandelbrot chart.zip Note that … Continue reading

Posted in Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, Newton, VBA
Tagged Charts, Excel, Mandelbrot Set, VBA
3 Comments

## Arcs and arc-splines

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

## More Python rotation functions

The code described in the previous post includes a Python function that rotates 3D coordinates by an angle defined with two vectors, using Rodrigue’s Rotation. I have now added this function to the IP2_py spreadsheet, where it is used in the … Continue reading

Posted in Coordinate Geometry, Drawing, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings
Tagged Excel, fit 3D circle, Numpy, Python, RPView, UDF, VBA, xlwings, xl_RPView
Leave a comment

## Use Matplotlib from Excel with xlwings

Xlwings is another free and open source package allowing communication between Excel and Python. It now incorporates ExcelPython, and is included in the Anaconda Python package, so will support my ExcelPython based spreadsheets after installation of xlwings using: conda install … Continue reading

Posted in Drawing, Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, VBA
Tagged Excel, ExcelPython, link Excel to Python, MatPlotlib, Python, VBA, xlwings
8 Comments