rank the values in each row

Question

Qian cao 2016-2-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/266651-rank-the-values-in-each-row

评论： Qian cao 2016-2-5

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

2 个评论
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Stephen23 2016-2-5

编辑：Stephen23 2016-2-5

在 MATLAB Online 中打开

@Qian cao: Please explain why row three is

2 1 2 4

and not

2 1 2 3

Qian cao 2016-2-5

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.

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Answer 1

Walter Roberson 2016-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/266651-rank-the-values-in-each-row#answer_208579

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.