How can i sum cells that equals in matrix

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Maxim Bragilovski
评论： Rik 2018-1-9
if i have a matrix like that
2 2 2 2
1 1 1 1
0 0 1 0
how can i calculate the sum of rows that the values in all of their columns are equals.
for this example i want it will return 2

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回答（2 个）

Roger Stafford
Roger Stafford 2018-1-9
You can also use the 'all' function:
sum(all(diff(a,1,2)==0))
  1 个评论
Rik
Rik 2018-1-9
It might not matter at all, but I would like to point out that this is about twice as fast as my answer (at least on my machine on R2017b and R2012b).

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Rik
Rik 2018-1-9
a=[2 2 2 2
1 1 1 1
0 0 1 0];
sum(sum(abs(diff(a,1,2)),2)==0)

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