How to reduce the length of a vector?

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Meshooo
Meshooo 2014-3-5
评论： Meshooo 2014-3-5
Dear all,
I have A which is 8x2 vector
A = [185 194; 155 208; 152 244; 174 258; 214 257; 223 236; 220 211; 215 198];
I want to generate B which is 50% of A by selecting every other pair.
B = [185 194; 152 244; 214 257; 220 211];
Any idea how to generate B?
Any idea will be appreciated.
Meshoo

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Roger Stafford
Roger Stafford 2014-3-5
B = A(1:2:end,:);

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