# Tag Archives: complex numbers

## Python for VBA users – 5; Using built in numpy functions

Previous Python Post In previous posts in this series I have looked at translating VBA functions to solve quadratic and cubic equations, but the Python numpy library has a polyroots function that will solve polynomials of any degree, and will … Continue reading

Posted in Arrays, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA | | 5 Comments

## Python for VBA users – 4; Python data types

Previous Python Post The basic range of data types in Python is quite simple, but by the time we have added additional types used in the numpy package, and translation of Excel data types into the Python equivalent the picture … Continue reading

Posted in Arrays, Excel, Link to Python, NumPy and SciPy, UDFs, VBA | | 5 Comments

## Daily Download 13: The ALGLIB maths library and Excel

Today we move onto maths related downloads, starting with the ALGLIB maths library, which has featured here quite frequently: Original post with link to site: ALGLIB Installing AlgLib with Excel VBA Download files: http://interactiveds.com.au/software/AL-Matrix-xlsb.zip   http://interactiveds.com.au/software/AL-Matrix-xls.zip Linking AlgLib C++ to Excel … Continue reading

Posted in AlgLib, Arrays, Excel, Maths, Newton, Numerical integration, UDFs, VBA | | 7 Comments

## Evaluating higher order polynomials …

… and a better solution for quadratics. Having written a better solver for high order polynomials, that raises a few other issues.  The error in the roots found by the RPolyJT was checked by simply substituting each root as the … Continue reading

Posted in Excel, Maths, Newton, UDFs, VBA | | 4 Comments

## Solving higher order polynomials

The Quartic spreadsheet presented here previously (most recently here) uses algebraic techniques to provide an “exact” solution to polynomial equations of up to fouth order.  For polynomials of higher order there is no general algebraic solution, and numerical methods are … Continue reading

Posted in Excel, Maths, Newton, UDFs, VBA | | 11 Comments

## Complex Numbers and Solving Quartic Polynomial Equations

It was recently pointed out to me that the User Defined Function (UDF) for solving quartic polynomial equations presented in this post returned an error for some input values.  In tracking down the source of the error I decided that it … Continue reading

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

## AlgLib Complex Number Functions

The AlgLib module ap.bas includes complex number functions which can be called from other VBA routines, but they cannot be used as User Defined Functions (UDFs)  because they use the user defined data type “Complex”: To  call these functions from the … Continue reading

Posted in AlgLib, Excel, Maths, Newton, UDFs, VBA | | 2 Comments