Category Archives: UDFs

Evaluate integrals to a specified tolerance

Posted on 10/03/2009 by dougaj4

A previous post presented a user defined function (UDF) to perform a numerical integration of a function specified as a text string.  The UDF allowed the number of subdivisions of the integration range to be specified, but the number of subdivisions required to … Continue reading →

Posted in Excel, Maths, Newton, UDFs | Tagged , , , , , | 2 Comments

Splitters!

Posted on 07/03/2009 by dougaj4

A recent post on the Tek-Tips VBA forum reminded me that VBA has a split function, which will split a string into sub-strings at any specified character (such as a space).  D’oh I thought, why did I waste my time writing … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , | Leave a comment

Importing tab delimited files and clearing large ranges

Posted on 01/03/2009 by dougaj4

Wray Sisk commented on Importing text files with VBA – 3, asking if it could be modified to read tab delimited files. It could be, and has been; download here: Text-in2.ZIP It turned out to be a simple task; just … Continue reading →

Posted in Excel, UDFs, VBA | Tagged , , , , , | 2 Comments

IP.xls updated

Posted on 16/02/2009 by dougaj4

The spreadsheet IP.xls has been updated (previous post) with the addition of a function to find the minimum perpendicular distance from a point (or series of points) to a polyline: Pdist =PDist(Line,Points) Line is a range with at least two rows containing … Continue reading →

Posted in Coordinate Geometry, Excel, Maths, Newton, UDFs, VBA | 1 Comment

Multiple Match Function

Posted on 11/02/2009 by dougaj4

The Excel function MATCH() will find the position of the first occurrence of a specified number or string in a range of data, but what if you want to find the first row in a table that contains two or … Continue reading →

Posted in Excel, UDFs, VBA | 5 Comments