Matlab Calling Functions without parentheses

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What is the correct name for the situation where a Matlab-script calls a function, but provides arguments without parentheses?

Example:

clear xx

Alternatively, I could use parentheses and transfer a string with the variable name:

clear('xx')

How can I distinguish between both alternatives when googling for a solution?

Bonus Question: How can I put the content of a variable into a call that is NOT using parentheses? Specifically, a build-script using mcc with a dynamic -o filename option; calling mcc with parentheses would also be acceptable, but I don't know how to google that, hence this question.

Thank you!

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