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Category Archives: Arrays
More Python Traps
I recently posted on some Python Traps, focussing on code where changes in the values of sub-routine arguments were not reflected in the calling routines. The reverse can also be a problem: if an array, a, is passed to a … Continue reading
Posted in Arrays, Excel, Link to Python, Newton, NumPy and SciPy, PyXLL, UDFs
Tagged Numpy, Passing variables, Python, python traps, PyXLL, UDF
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LinEstGap with non-linear functions
The LinEstGap user defined function (UDF) allows the built-in Linest function to be used on data with empty cells or hidden rows, returning results that agree with the chart trend-line function, which automatically ignores blank cells and hidden data. It … Continue reading
Posted in Arrays, Curve fitting, Excel, Maths, Newton, UDFs, VBA
Tagged Excel, Exponential curves, Linest, Linest with gaps, Log curves, non-linear curve fitting, Polynomial curves, Power curves, UDF, VBA
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Python Traps
When converting existing VBA code to Python there are a number of obvious changes to the syntax that need to be made for the code to run at all, but there are also a number of not so obvious traps … Continue reading
Posted in Arrays, Excel, Link to Python, Newton, NumPy and SciPy, PyXLL, UDFs, VBA
Tagged Excel, for loop counters |, Numpy, Passing variables, Python, python traps, PyXLL, UDF, VBA
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Excel Dynamic Arrays
Previews of dynamic arrays in Excel have been available for some time through the “Insider” programme. They are now being published to general subscribers through Office 365 monthly updates: Further information is given at: Easier array formulas and Dynamic array … Continue reading
Posted in Arrays, Excel, UDFs
Tagged array functions, CSE array functions, dynamic arrays, Excel, UDFs, VBA
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Using conditional formatting with array formulas
A recent Quora question asked “How do I highlight the number closest to an initial number in a row in Excel?“. The answer by Bill Jelen provides a good example of using conditional formatting with an array formula: In my … Continue reading
Posted in Arrays, Excel
Tagged Array Formula, conditional formatting, Excel, Office Insider
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Working with dynamic arrays in Excel
Many of the VBA functions available here return results as arrays, which must be entered by selecting the desired output range, then pressing Ctrl-Shift-Enter (CSE). This can be inconvenient (or at least untidy) when the size of the output array varies. … Continue reading
Posted in Arrays, Excel, UDFs, VBA
Tagged Charles Williams, dynamic arrays, Excel, Fast Excel, VBA, Wndows Insider
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Transferring large arrays with Pyxll
Pyxll is a commercial Excel add-in linking Excel and Python. The latest version offers greatly improved performance in transferring data between Excel and Python as Numpy arrays, amongst many other new features and improvements. To check what this means in practice, … Continue reading
Posted in Arrays, Excel, Frame Analysis, Link to Python, PyXLL, UDFs, VBA
Tagged data transfer time, Excel, large arrays, Python, PyXLL, UDFs, VBA
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