extracting the nth multiple rows of a large matrix to create a submatrix

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MIRABEL ACQUAH 2018-12-5

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评论： Stephen23 2022-4-20

Hi. Please i have a large matrix a=(1290 x 2) and i want to extract rows in multiple of 5 to create a new matrix. For example, a new matrix x, should be made of, the 5th row,10th row,15th row and so on, of matrix a. Please help me, I am new to MATLAB. Thanks

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madhan ravi 2018-12-5

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编辑：madhan ravi 2018-12-5

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Simpler and easier:

x = a(5:5:end,:) % edited after all the comments

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Image Analyst 2018-12-5

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And (should be obvious, but evidently she's a beginner), to create the x she asked for:

x = a(5:5:end,:)

madhan ravi 2018-12-5

Thank you sir Image Analyst!

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Kevin Chng 2018-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/434004-extracting-the-nth-multiple-rows-of-a-large-matrix-to-create-a-submatrix#answer_350683

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try, let say a is your matrix(1290x2)

a(1:5:1290,:)

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MIRABEL ACQUAH 2018-12-9

Thanks a lot.

Stephen23 2022-4-20

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This answer does not select the requested rows:

1:5:1290
ans = 1×258
     1     6    11    16    21    26    31    36    41    46    51    56    61    66    71    76    81    86    91    96   101   106   111   116   121   126   131   136   141   146

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