what's the "str2num" mean?
str2num means "convert string to number"; even more cryptic is the fact that "str2num 1:10" is equivalent to "str2num('1:10')" (Matlab allows you to omit the single quotes and parentheses when using functions that take character strings as arguments).
Back to basics 26 - Keywords
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Add two numbers
03 - Matrix Variables 1
MATLAB Basic: rounding II
Replace NaNs with the number that appears to its left in the row.
Encode Roman Numerals
Remove any row in which a NaN appears
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