how p(:,j) differs from p(j,:)?
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I often see people using these,
how p(:,j) differs from p(j,:)?
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Azzi Abdelmalek
2012-12-27
编辑：Azzi Abdelmalek
2012-12-27
p=[1 2;3 4;5 6]
check this
p(:,2)
p(3,:)
p(:,2) means all lines, column number 2, p(3,:) means all columns, line number 3
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Hajar ALSHOUFI
2019-9-4
if we have n points =21
I saw a code the author wrote:
p(ny,:) where p is some matrix, how can we understad it, I know the first one refers to rows and the second for columns but how can we understand it what rows is he speaking about
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Wayne King
2012-12-27
编辑：Wayne King
2012-12-27
p(:,j) takes all the rows and the j-th column of p
p(j,:) takes the j-th row and all the columns of p
So
p = [1 2; 3 4];
j = 1;
p(j,:)
p(:,j)
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