How to find number in a matrix and output its row number?

I have a coloumn vector

M = [83 82 86 84 85 90]

How can I find at which row the matrix has a value of 85 (should output row = 5 since 85 is on the 5th row)

Answer 1

[Walter Roberson]

M = [83 82 86 84 85 90].'

M = 6×1

83 82 86 84 85 90

[row, column] = find(M == 85)

row = 5

column = 1