Covering some basic topics I haven't seen elsewhere on Cody.
Return a string that is the path to the system's current temp directory
The assert is wrong. Dirs should not be tested as equal strings - slash can be omitted.
Maximum value in a matrix
01 - Scalar variables
Swap two numbers
Back to basics 25 - Valid variable names
Back to basics 20 - singleton dimensions
Back to basics 16 - byte order
Back to basics 14 - Keywords
Back to basics 24 - Symbolic variables
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