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Selecting an entry of a row in a large matrix

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amberly hadden
amberly hadden 2015-7-31
评论： amberly hadden 2015-7-31
Can any one help me with this ?
I want to select each 3rd row and first entry of it and want to output all values in a matrix. Next I want to remove this out put vector from original matrix a =
64 2 3 61 60 6 7 57
9 55 54 12 13 51 50 16
17 47 46 20 21 43 42 24
40 26 27 37 36 30 31 33
32 34 35 29 28 38 39 25
41 23 22 44 45 19 18 48
49 15 14 52 53 11 10 56
8 58 59 5 4 62 63 1
ans
b =[17 41];% this is what I need in first step
and then final matrix with removing every 3rd row (which omits the every third row)
Thanks, Amb

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采纳的回答

amberly hadden
amberly hadden 2015-7-31
out = a(3:3:end,:)
this worked but now I just wanna remove these rows from original matrix

更多回答（1 个）

James Tursa
James Tursa 2015-7-31
b = a(3:3:end,1); % 1st element of every 3rd row
a(3:3:end,:) = []; % remove every 3rd row

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