rank the values in each row

Hi all, If I have a matrix like

A=
 0.2  NaN  0.8  0.8
-0.2  1  0.3  0.2
0.2  -0.3  0.2  2
0.7  -0.1  -0.4  0.7
NaN  0.2  NaN  0.9

How do I get a resulting matrix B which ranks each row of A and the result shows like this ... Pay attention to row 3. Thank you for your answer.I am playing around some tricks in Matlab and looking for a best solution to problems as this one...

B=
1  NaN  2  2
1  4  3  2
2  1  2  4
3  2  1  3
NaN  1  NaN  2

[Stephen23]

@Qian cao: Please explain why row three is

2  1  2  4

and not

2  1  2  3

[Qian cao]

Hi, This is an exercise given by our teacher. He said when there are 2 equal values, the rank of the next value larger than them will be +2 instead of +1.

Answer 1

[Walter Roberson]

Loop through the rows. For any one row, you can use the third output of unique as the index, except that you would have to replace the entries corresponding to NaN.

[Stephen23]

Using uniquetol to do this would be more robust.