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CSVgraph 3v9
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@p-j-miller p-j-miller released this 27 Feb 21:09
· 5 commits to main since this release
3v9
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Learn about vigilant mode.

Changes with 3v9:

Can now open a file that excel already has open (and error messages are better on failing to open files).

Better trapping of user pressing a "command" button while a previous command is still running.

Derivative now uses 17-point Savitzky Golay algorithm with user specified order (1->10 is actually used, can be set 1->infinity by user).

Savitzky Golay smoothing added as a filtering option (25 points, with user specified order, 1->10 is actually used, can be set 1->infinity by user).

Added 2nd derivative (d2y/d2x) to list of filters which uses a 25-point Savitzky Golay algorithm with user specified order (1->10 is actually used, can be set 1->infinity by user).

If a number is missing in a column referred to in an expression this will be set to nan.

Added constant "nan" for expressions.

If an expression evaluates to nan the line is skipped so this can be a powerful way to select points for csvgraph to display.

Added "variables" x and line to expressions. x is current x value, and line is current line number.

Updated expression handler so nan==nan and nan!=nan work as expected in expressions.

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