Matlab - select all rows starting with a particular number

Question

Say I have a matrix A, and I want to construct a matrix B that contains all rows of B that start with a particular number. How? Thanks

user492238 · Accepted Answer · 2011-04-06 04:34:50Z

9

Select all rows of B into A, where the first colum of B has value n:

A = B(B(:,1) == n,:);

In contrast to that, the following selects all rows of B into A, starting from row index n:

A = B(n:end,:);

edited Apr 6, 2011 at 4:34

answered Apr 6, 2011 at 3:08

user492238

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2 Comments

Yebo Over a year ago

No, I meant rows that contain the particular number. For example, if A=[1 2; 3 4; 1 7] and we look for all rows starting with 1, I'd like to get [1 2; 1 7]

user492238 Over a year ago

I merged the other answer into that one.

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