Matrices in VEX; what does the ampersand with matrices mean?

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For example

void rotate(&m, amount, axis)

I used to know it 6 months ago, I even made a note on it but now I can't find that note.
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generally in VEX it just means that that variable will be modified
so your m matrix itself will be rotated, rather than rotated matrix being returned from the function
Tomas Slancik
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Method Studios, NY
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Thanks a lot to both of you for your generous replies.
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