Category Archives: Arrays

Iterative solvers and arrays

Posted on 21/10/2018 by dougaj4

A recent thread at Eng-Tips was looking for a solution to the problem described  below: The solutions to this problem described below can be downloaded from: ItSolve.zip and xlScipy3.zip The ItSolve.xlsb spreadsheet contains a user defined function (UDF) to solve iterative … Continue reading →

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

Using VBA Evaluate as an Array Function

Posted on 24/08/2018 by dougaj4

I recently discovered from a thread at  Chandoo’s Excel Forum that the VBA Evaluate function can be used as an array function.  As a simple example: Range(“A11:A16”).Value = Evaluate(“= B11:B16 + C11:C16”) will add the values in columns B and C, … Continue reading →

Posted in Arrays, Coordinate Geometry, Excel, Maths, UDFs, VBA | Tagged , , , , | 2 Comments

VBA vs Power Query vs Python

Posted on 04/08/2018 by dougaj4

A recent post at Chandoo’s Excel Forum asked for a formula to extract all pairs of digits from a number with 4 digits.  This was soon extended to dealing with longer numbers, and the examples looked at here will work with … Continue reading →

Posted in Arrays, Excel, Link to Python, UDFs, VBA, xlwings | Tagged , , , , , , , | Leave a comment

Passing variable argument lists from Excel to Python via xlwings

Posted on 08/06/2018 by dougaj4

When calling a Python function it is sometimes necessary to pass a variable number of arguments.  Examples from the xlw_Scipy spreadsheet include: Curve fitting functions, for which the functions to be fitted may have any number of arguments. The Scipy … Continue reading →

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

Returning Arrays From VBA and Python

Posted on 01/06/2018 by dougaj4

Most  of the  user defined functions (UDFs) presented on this blog return a multi-cell array, that must be entered by selecting the output range then pressing Ctrl-shift-enter to display all the results.  This process has several inconveniencies: You need to know … Continue reading →

Posted in Arrays, Excel, Link to Python, UDFs, VBA, xlwings | Tagged , , , , , , , | 1 Comment