How can I find the elements of a matrix that are lower than a given number and the minimum of those elements?

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WarriorPlatypus
WarriorPlatypus 2018-8-28
编辑： WarriorPlatypus 2021-3-13
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Stephan
Stephan 2018-8-28
编辑：Stephan 2018-8-28
Hi,
A = hilb(70);
B = A(A < 0.01); % copy all elements <0.01 into vector B;
C = min(B) % get the min value from B
D = min(min(A)) % same result like C, but directly taken from A
Best regards
Stephan

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Arthur Nascimento
Arthur Nascimento 2018-8-28
编辑：Arthur Nascimento 2018-8-28
To get the indexes of the elements lower than a number you can do:
A = hilb(70);
A<0.01
If you want the value of said elements you can do
A(A<.01)
To find the index of the minimum element you can use
A(A==min(A))
Or the element
min(A)
  1 个评论
Stephan
Stephan 2018-8-28
编辑：Stephan 2018-8-28
Note that if A is a matrix, then min(A) is a row vector containing the minimum value of each column.
So
min(A)
will not give the smallest one element from A but a 1x70 vector.
Also note that:
A(A==min(A))
does not give back indices, but a transposed version of the vector made by min(A) with dimensions 70x1.

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