Recent Comments
Clive James and Pete… on The Barrow Poets 
dougaj4 on Excel to Alglib via xlwin… Roulior Halder on Excel to Alglib via xlwin… dougaj4 on Excel to Alglib via xlwin… dougaj4 on Excel to Alglib via xlwin… dougaj4 on How to digitise a scanned… 
Gabriel on How to digitise a scanned… Gabriel on How to digitise a scanned… Gabriel on How to digitise a scanned… Roulior Halder on Excel to Alglib via xlwin… Roulior Halder on Excel to Alglib via xlwin… 
Angelo on Biaxial bending update dougaj4 on Excel to Alglib via xlwin… dougaj4 on Biaxial bending update Roulior Halder on Excel to Alglib via xlwin…
Tag Archives: vectors
The angle between two vectors, in 2D or 3D
Finding the angle between two lines in 2D is easy, just find the angle of each line with the x-axis from the slope of the line and take the difference. In 3D it is not so obvious, but it can … Continue reading
Posted in Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA
Tagged 3D angle, angle between two vectors, cosine rule, Excel, UDF, VBA, vectors
9 Comments
Daily Download 25: Vector Functions
Today’s download file provides a variety of vector arithmetic functions, which can be used either from other VBA routines, or on the spreadsheet as User Defined Functions. Download file: http://interactiveds.com.au/software/VectorFunc.xlsb In addition to Dot and Cross the spreadsheet contains the following … Continue reading
Posted in Excel, Maths, Newton, UDFs, VBA
Tagged cross product, dot product, Excel, UDF, VBA, vector area, vectors
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
Area from Vectors
The previous post looked at User Defined Functions (UDFs) for working with vectors, including examples of functions to find the area of polygons defined by coordinates. In this post the functions will be extended to find other section properties (such … Continue reading
Posted in Arrays, Coordinate Geometry, Excel, Maths, UDFs, VBA
Tagged Area, coordinates, Excel, section properties, UDF, VBA, vectors
5 Comments
Dots and Crosses
The comments from Bill Harvey in the previous post prompted me to have a closer look at the functions available in Excel for working with vectors. Here is a complete list of them: =SUMPRODUCT() (Equivalent to the vector dot product) This … Continue reading
Posted in Arrays, Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA
Tagged cross product, dot product, Excel, UDF, VBA, vector area, vectors
11 Comments
