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You can try instead keeping the IDs list as a dataframe, timelineIds, and inner joining the table with it based on timelineid. Then remove the unnecessary column (timelineIds.timelineid) from the resulting df.

Illegal UTF characters can easily arise through mistakes. An example:

Edit:

The ATMega32 bit macros are the actual bit numbers (0, 1) and need to be leftshifted when used in bitwise expressions with the registers.

ACSR |= (ACIE)|(ACIS1);
should be
ACSR |= (1 << ACIE)|(1 << ACIS1);

There's lots of things that could go wrong here. and I don't see anything obviously wrong (other than the above).

I added a line of code to toggle another pin between the while loop to see if any interrupts at all occur but the pin inside the while loop keeps toggling

I don't understand what this means - could you add a code snippet for this test?

Here's a couple of troubleshooting steps I'd take.

1. Can you verify that this code can light up the LED?

This could isolate a problem with the LED code / circuit.
Try some main function like this:

As a general rule I expect matmul to be faster, though with simpler cases it appears that einsum actually uses matmul.

But here my timings

AutoCAD is only nice and accommodating up to DXF version R12, from DXF version R13+ AutoCAD is very picky. MTEXT requires at least DXF R13+ and therefore it is much more work to do to create a DXF file which AutoCAD accepts. The error messages are often not very helpful and much information is missing in the DXF reference.

1. DXF R13+ requires an unique handle for each entity (group code 5)

2. DXF R2000+ requires an owner handle (group code 330). DXF R13/14 may not need a owner handle. The owner handle is the handle of the BLOCK RECORD of the layout in which the entity resides. For DXF R13+ the BLOCK RECORD is the central structure to manage blocks and layouts, because the BLOCK RECORD "owns" all the entities, not the BLOCK or LAYOUT.

3. DXF R13+ separates the data of different subclasses (C++ internals of AutoCAD) by subclass markers. There are two missing subclass markers, first the (100, "AcDbEntiy") which marks the begin of common DXF properties like layer and linetype. The second is the (100, "AcDbMText") maker for the begin of the MTEXT specific attributes.

Your code (before MTEXT) may have worked, because you only used DXF R12 entities and AutoCAD ignored features from later DXF versions.

If you implement DXF R2000+ support you also have to add further required structures: https://ezdxf.mozman.at/docs/dxfinternals/filestructure.html#minimal-dxf-content

You need to specify some options properly:

To generate a random word of length L: keep the alphabet in an array of size N, and get a random word of length L by swapping the i'th element for a random element in i to N-1 for i in [0, L-1].

To generate the x'th word of length L in alphabetical order: Note that for a word of size L made up of distinct letters from an alphabet of size N, there are (N-1)! / (N-L)! words starting with any given letter.

E.g., N=5, L=3, alphabet = ABCDE. The number of words starting with A (or any letter) is 4! / 2! = 12. These are all the ordered N-L-length subsets of the available N-1 letters.

So the first letter of word(x, N, L) is the x / ((N-1)! / (N-L)!) letter of the alphabet (zero-indexed).

You can then build your word recursively.

E.g., word(15, 5, 3, ABCDE): The first letter is 15 / (4! / 2!) = 15 / 12) = 1, so B.

We get the second letter recursively: word((15 % (4! / 2!), 4, 2, ACDE) = word(3, 4, 2, ACDE). Since 3 / (3! / 2!) = 3 / 3 = 1, the second letter is C.

Third letter: word(3%3, 3, 1, ADE) = word(0, 3, 1, ADE) = A.

You can try your logic here:

When you setup conditional formatting you have to be very careful about how you specify things. When setting up your formulas you only reference the 1st row of your AppliesTo range, excel will adjust the references as it moves down the range. Of course this will be different if you are referencing cells that are not in your first row. If referencing constants remember to use the $ for the rows/columns that don't change.

In this specific case the formula you want is: =AND(A3<(TODAY()),B3=0,A3<>0)