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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Answer 1

[Stephan]

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

[WarriorPlatypus]

Thanks sir!

Answer 2

[Arthur Nascimento]

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)

[Stephan]

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.