### Categories

### RSS Feed

### Search NewtonExcelBach

### Archives

### Top Posts

- Commenting a block of code in VBA
- Using Goal Seek on Multiple Cells
- The angle between two vectors, Python version
- Weighted Least Squares Regression, using Excel, VBA, Alglib and Python
- Cubic Splines
- Solving Quadratic, Cubic, Quartic and higher order equations; examples
- Downloads
- Drawing in Excel 7 - Creating drawings from coordinates
- Problems with UCase and LCase in VBA
- Using LINEST for non-linear curve fitting

### Recent Comments

The age of snakeoil… on They all laughed at Christophe… dougaj4 on Buckling of columns with varyi… Manoj Deo on Buckling of columns with varyi… dougaj4 on Buckling of columns with varyi… Manoj Deo on Buckling of columns with varyi… Indexing pdf files,… on Indexing pdf content dougaj4 on The answer to Life the Univers… Matija Bandić on The answer to Life the Univers… Afazio on Plotting Mandelbrot dougaj4 on Plotting Mandelbrot Afazio on Plotting Mandelbrot r/excel - LINEST… on Weighted Least Squares Regress… dougaj4 on Downloads Rajesh M on Downloads dougaj4 on Downloads

# Category Archives: Drawing

## 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

## Section Properties – Lunes and Groups

Following a discussion at Eng-Tips and resulting comments I have updated my Section Properties spreadsheet to include calculation of the area and centroid of a “Lune” (the shape of a crescent moon). I have also added a “Re-draw Shape” button because … Continue reading

Posted in Drawing, Excel, Maths, Newton, VBA
Tagged Excel, group properties, Lune, section properties, VBA
2 Comments

## “Yields circularity when preceded by its quotation” …

yields circularity when preceded by its quotation. Today’s post takes us on a little circular tour of the internet, starting with: Grumpy Old Programmer (Mike Woodhouse) who returns from a long holiday from blogging to publish a nice little routine … Continue reading

Posted in Computing - general, Drawing, Newton
Tagged Computer Quine, Douglas Hofstadter, Golfed code, Illusion, MU, Quine
Leave a comment

## Daily Download 20: Section Properties

The download spreadsheets today provide functions to find section properties of shapes either defined by coordinates or selected from a list of shape types. The section properties found are: area, first and second moments of area about the X and Y … Continue reading

Posted in Charts, Coordinate Geometry, Drawing, Excel, Maths, Newton, UDFs, VBA
Tagged Excel, Section Properties; Area; First Moment of Area; Second Moment of Area, UDF, VBA, vectors
Leave a comment