How to display the row number ?

i want to know how to display a row numbers in this example:

 a=[     'X'       'Y'       'Z'
  30.4596   37.6811   93.0000
  154.6678  172.8173   91.0000
  44.7308  175.6077   94.0000
  90.8282  191.0239   91.0000
  149.5394  149.1930   70.0000];
b=         'Z'
  [93.0000];
tolerance = 0.00001;
% Subtract third columns
matches = abs(a(:,3) - b) < tolerance
% Extract matching rows.
c = a(matches, :)

if you run this code you will get number of matches 'b' with 'a', and now i want that row number also to display, which means that if 'b' is matched with 'a'(column 3), now i have to display the corresponding row number.

Output should be like

 d=[1];%(represent row number)

NOTE: Want to display 'b' is belongs to which number of row's in 'a'

Answer 1

[Matt J]

 d=find(matches)

[Matlab111]

ya k, but if 'b' is dose not matched with 'a' than it's showing empty matrix like this

 " Empty matrix: 0-by-1"

so now i want to delete this " Empty matrix: 0-by-1 " empty matrix.

Answer 2

[Image Analyst]

Again, this was asked and answered already: http://www.mathworks.com/matlabcentral/answers/174121#comment_263635