Sort a vector in matlab

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Camilo Corredor
Camilo Corredor 2015-8-27
评论： Camilo Corredor 2015-8-31
Somebody can help me? From the routine in Matlab I get a vector whose length can be a number between 0 and 24. The content of this vector are numbers between 0 and 24. However, I have to sort this vector with the next conditions
1. The content must be equal to index of the sorted vector. 2. If in the content of the vector, a number doesn't exist must be equal to NaN
For example
Index Content
  • 1 10
  • 2 11
  • 3 12
  • 4 15
  • 5 16
  • 6 17
  • 7 18
  • 8 19
  • 9 20
  • 10 22
  • 11 24
In the left side is index vector and in right side the content The sorted vector that I hope to get is:
  • 1 2
  • 2 2
  • 3 3
  • 4 4
  • 5 5
  • 6 6
  • 7 7
  • 8 8
  • 9 9
  • 10 10
  • 11 11
  • 12 12
  • 13 13
  • 14 14
  • 15 15
  • 16 16
  • 17 17
  • 18 18
  • 19 19
  • 20 20
  • 21 21
  • 22 22
  • 23 23
  • 24 24
Thank for your help!
  2 个评论
the cyclist
the cyclist 2015-8-27
编辑：the cyclist 2015-8-27
I don't understand the rule you are trying to explain, or your example. Can you use actual MATLAB commands to define your input/output, such as
x = [1 10; 2 11; etc]
y = [1 2; 2 2; 3 3; etc]
and give another example or two of input/output?
Camilo Corredor
Camilo Corredor 2015-8-27
the vector length and the elements are random between 0 and 24. However the elements are sorted but they do not correspond with index vector. For example:
This vector
Left side = index vector Right side = content vector
Then,
  • 1 3
  • 2 4
  • 3 5
  • 4 10
  • 5 11
  • 6 13
  • 7 14
  • 8 15
  • 9 16
Then, I must to have a length vector equal to 24, where the content of every index vector be equal to index. But if any number does not exist, then one could put in that element vector 0 or NaN.
I thank your help. If is possible, this is my email cami23.cr23@gmail.com Maybe we can talk by hangout It's very important, this is for my undergraduate thesis

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Stephen23
Stephen23 2015-8-27
编辑：Stephen23 2015-8-27
For clarity I have not included the indices, but these are simple to include if required.
>> inp = [10;11;12;15;16;17;18;19;20;22;24];
>> out = nan(24,1);
>> out(inp) = inp
out =
NaN
NaN
NaN
NaN
NaN
NaN
NaN
NaN
NaN
10
11
12
NaN
NaN
15
16
17
18
19
20
NaN
22
NaN
24
Note that I assumed that the minimum value is one, as this is what the example values show (and which contradict the OP's original question which states a minimum value of zero).
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Stephen23
Stephen23 2015-8-28
编辑：Stephen23 2015-8-28
If you have another vector of values vec with the same number of elements as inp, then you can use much the same indexing as in the answers I gave you:
>> inp = [0;10;11;12;15;16;17;18;19;20;22;24];
>> vec = [0,01,11,21,51,61,71,81,90,02,22,42];
>> out = nan(25,2);
>> out(inp+1,1) = inp;
>> out(inp+1,2) = vec
out =
0 0
NaN NaN
NaN NaN
NaN NaN
NaN NaN
NaN NaN
NaN NaN
NaN NaN
NaN NaN
NaN NaN
10 1
11 11
12 21
NaN NaN
NaN NaN
15 51
16 61
17 71
18 81
19 90
20 2
NaN NaN
22 22
NaN NaN
24 42
You can learn how these basic commands work by doing MATLAB's introductory tutorials:
http://www.mathworks.com/help/matlab/getting-started-with-matlab.html
Camilo Corredor
Camilo Corredor 2015-8-31
Thank you!
I solved my problem! :)

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