How to emtpy part of a matrix?

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Terek Li
Terek Li 2016-10-17
评论： Terek Li 2016-10-17
If I have a matrix like this :
a = [1 2; 3 4; 5 6; 7 8]
is there a quick way to remove '3' and '4' from the matrix so it looks like :
a = [1 2; [] 4; [] 6; 7 8]?
I only want to remove value in the 1st column starting on the 2nd row and ending at the 2nd last row.
THANKS!

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2016-10-17
a = [1 2; 3 4; 5 6; 7 8];
a(2:3,1) = nan;

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