operation in matrix in matlab

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ali hassan
ali hassan 2022-1-31
编辑： Arif Hoq 2022-1-31
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.

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采纳的回答

Arif Hoq
Arif Hoq 2022-1-31
Ran in:
a=[3 4 2 5 3 5];
expected_value=a(find(a>4))
expected_value = 1×2
5 5
how_many_times= length(find(a>4))
how_many_times = 2
Or
times=length(expected_value)
times = 2
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Arif Hoq
Arif Hoq 2022-1-31
to find index try with this:
[row,col]=find(a>4);
Arif Hoq
Arif Hoq 2022-1-31
编辑：Arif Hoq 2022-1-31
Ran in:
a=[3 4 2 5 3 5];
expected_value=a(a>4)
expected_value = 1×2
5 5
how_many_times= length(find(a>4))
how_many_times = 2
[row,col]=find(a>4)
row = 1×2
1 1
col = 1×2
4 6

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更多回答（1 个）

Stephen23
Stephen23 2022-1-31
编辑：Stephen23 2022-1-31
Ran in:
"...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)
ans = 2

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