select certain matrix elements

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zilai si
zilai si 2019-10-15
编辑： Fabio Freschi 2019-10-15
hello,everyone
i just want to ask how to select eg the 1-10 and 20-30 rows elements in the first column.
like A(1:10 and 20:30,1)

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Fabio Freschi
Fabio Freschi 2019-10-15
编辑：Fabio Freschi 2019-10-15
You can simply concatenate your ranges using square brackets:
A([1:10 20:30],1)

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