Sort a vector in matlab

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!

[the cyclist]

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]

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 [e-mail] Maybe we can talk by hangout It's very important, this is for my undergraduate thesis

Answer 1

[Stephen23]

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).

[Camilo Corredor]

I tried to use a vector containing 0 and those instructions does not work. I think that Matlab does not identify the index vector 0.What can I do to read value 0 in the vector?

Thanks for your help!

Awesome solution!

Greetings from Colombia.

[Stephen23]

>> inp = [0;10;11;12;15;16;17;18;19;20;22;24];
>> out = nan(25,1);
>> out(inp+1) = inp
out =

       0
     NaN
     NaN
     NaN
     NaN
     NaN
     NaN
     NaN
     NaN
     NaN
      10
      11
      12
     NaN
     NaN
      15
      16
      17
      18
      19
      20
     NaN
      22
     NaN
      24

[Camilo Corredor]

Thank!

I really appreciate it!

Greetings from Colombia!

[Camilo Corredor]

Excuse me Sir, But I have another question

If i had associated information to the vector inp like in your example but this data does not have any trend or structure. How can I organize it with the same structure?

Thank you!

[Stephen23]

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]

Thank you!

I solved my problem! :)