How can I find the indices of a vector?

If I have a row vector,what command allows me to find the indexes that exceed a certain value that I want as a threshold. For example:

A =

    0.1222
    0.1350
    0.1759
    0.1110
    0.1015
    0.2599
    0.1465

I would like in output the indices of the value grater or equal than 0.123, for example.

Answer 1

[Mischa Kim]

Use

 ind = find(A >= 0.123)

[Francesco]

And If I want to extract some the numeric value of an 19x2 double array (for example) according to the number of the ind variable how can I do?

Answer 2

[Thomas]

 [r,c]=find(A>=0.123)