operation in matrix in matlab
显示 更早的评论
if i want to know the number of times an condition is fullfilled for a matrix, how can i do so;
a=[3 4 2 5 3 5]; %defining a matrix
% now what should i write if i want to know the number of times, a matrix
% has a value greater than 4.
采纳的回答
a=[3 4 2 5 3 5];
expected_value=a(find(a>4))
how_many_times= length(find(a>4))
Or
times=length(expected_value)
4 个评论
ali hassan
2022-1-31
Walter Roberson
2022-1-31
where = find(a>4)
expected_value = a(a>4);
the find() is not necessary in that context.
Arif Hoq
2022-1-31
to find index try with this:
[row,col]=find(a>4);
a=[3 4 2 5 3 5];
expected_value=a(a>4)
how_many_times= length(find(a>4))
[row,col]=find(a>4)
更多回答（1 个）
"...i want to know the number of times, a matrix has a value greater than 4."
The efficient MATLAB approach:
a = [3,4,2,5,3,5];
nnz(a>4)
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