Error getting day of year from datetime.

Hi - I'm trying to extract a day of year from a datetime, and get the error message: "Function 'subsindex' is not defined for values of class 'datetime'."

I get this message even when I copy-paste the code from the documentation for the day function:

t = [datetime('yesterday');datetime('today');datetime('tomorrow')]
d = day(t)

Any ideas or suggestions?

Answer 1

[Steven Lord]

You've probably defined a variable named day in your workspace. MATLAB is trying to use the datetime array as an index into that variable, but MATLAB doesn't know how to do that. [What is x(lastTuesday)?] Remove the variable and the command should work.

[Adrienne Marshall]

You're exactly right - thank you!