MATLAB: How to sort an array in descending order and you also have idea about the position to which it descend

sort out array

I have an array of any length and I want to sort them in descending order. The position and value in that matrix refer to an ID of a node. So my question is that how I can sort this array in descending order and I should have idea of node position in array after sorting out.
Like I have a matrix A and the first value of the array is 5 but its ID is 1 and second value is 4 and its ID is 2 so after descending it goes to some new position 11 and 4 to 12 in the array. then whether i can get in a variable the position of variables after sorting out.
if true
  A = [ 5 4 61 7 1 3 35 67 11 44 83 48 110 6]
  B = sort (A, 'descend');
  B =  110    83    67    61    48    44    35    11     7     6     5     4     3     1
  ID_pos of 5 = 11 and ID_pos of 4 = 12 so how to get these index automatically. 
end
Kindly guide me

Best Answer

Use the ismember function:
A = [ 5 4 61 7 1 3 35 67 11 44 83 48 110 6];
B = sort (A, 'descend');
[~,Idx] = ismember([5 4], B)
Idx =
    11    12
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