Question

In a 2 dimensional list like the one below, is there any way, using the Count function to count all rows where first column equals 1, second equals 2 and third does not equal 3?

I tried Count[Data,{1,2,_?(#!=3&)}] – but it doesn’t work :(. Am I doing something wrong using patterns?

1 2 3

2 2 3

1 1 1

1 2 1

1 3 2

3 3 3

3 2 1

1 2 2

Many thanks,
m

Answer 1

Yes, I think your pattern is awry. Try

Count[data, {1, 2, x_ /; x != 3}]