Return indices of sorted array

I'd like to sort an array and be able to use the sorted indices to sort another array (easy in Matlab).
I see there's an OpenG vi, but I was wondering if it can be done in standard LabVIEW.
Thanks!

Never mind ... I ended out writing my own vi to sort returning index and then sort using index (attached).
Attachments:
SortAndIndex.vi ‏12 KB
SortByIndex.vi ‏11 KB

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I need sorting VI that returns the sorted array element's positions in the unsorted array

I need a VI that will very quickly (n log n) sort a 1D array of doubles. This VI should not only output the sorted array, but for each of the sorted array elements, it should also output that sorted array element's position in the unsorted array. So for example if the input array were:
unsorted_array
4.1
2.3
7.0
5.6
10.2
Then the output arrays would be:
sorted_array
2.3
4.1
5.6
7.0
10.2
indices_array
1 (the value 2.3 is located at position 1 in the unsorted_array)
0 (the value 4.1 is located at position 0 in the unsorted_array)
3 (the value 5.6 is located at position 3 in the unsorted_array)
2 (the value 7.0 is located at position 2 in the unsorted_array)
4 (the value 10.2 is located at position 4 in the unsorted_array)
This way I could generate the sorted_array using just the indices_array and the unsorted_array. Has anyone written a nifty piece of code to do this? I did some research on (n log n) sorting algorithms but most of them use recursion which I don't know how to do in LabVIEW. It would also be nice to have an algorithm like this that could sort an array of strings.
cheers,
Richard

Try something like the attached example (LabVIEW 7.0). I think it does what you need.
(To understand the code, it is important to know that arrays of clusters are sorted by the first element in the cluster).
Sort array itself sorts also array of strings, so you could just substitute, keeping the rest of the code the same.
Sort array uses a variation of quicksort, so it should have about NlogN complexity.
(If you think you only need the array of indices to later generate the sorted array, it does not make much sense to even do it. To get the indices, you need to sort the array anyway. You should just sort the plain array directly.
Message Edited by altenbach on 07-13-2005 03:47 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
SortAndIndex.vi ‏26 KB

Index of sorted array

I have a unsorted array as follows:
array_index = {0 1 2 3 4 5 6 7 8}
array = {1 2 4 3 4 3 4 2 1}
I would like to get the previous index of sorted array as follows:
old_index = {2 4 6 3 5 1 7 0 8}
arrray.sort doesn't return the index the previous index, please help me.

You can do that using by creating an array containing the numbers 0 to n in increasing order and sorting that using a comparator that actually compares the content of the original array at the indices provided to it instead of the values themselves.
But why would you need that? Could you describe your requirement in a broader scope?

Exception handling in sorting arrays

Hi all, I have a problem with the use of the built in java sort fo arrays. My program works on an array with 4 or 5 entities. When I run it in some folders it works but not in others. I get the following error after compilation, where "ResultData" is the class of array to be sorted:Exception in thread "main" java.lang.NullPointerException
at ResultData.compareTo(TextEdit.java:1215)
at java.util.Arrays.mergeSort(Arrays.java:1064)
at java.util.Arrays.mergeSort(Arrays.java:1071)
at java.util.Arrays.mergeSort(Arrays.java:1072)
at java.util.Arrays.mergeSort(Arrays.java:1071)
at java.util.Arrays.mergeSort(Arrays.java:1071)
at java.util.Arrays.mergeSort(Arrays.java:1071)
at java.util.Arrays.sort(Arrays.java:1014)
at java.util.Collections.sort(Collections.java:78)
[\code]Can any one give a suggestion?

Here is the code for the class "ResultData"class ResultData implements Comparable
     String file1;
     String file2;
     double var, var1, var2;
     public ResultData(String f1,String f2,double v, double x, double y)
               file1= f1; file2=f2;
               var=v; var1=x; var2=y;
     public String getFile1Name()
          return file1;
     public String getFile2Name()
          return file2;
     public double getVar()
          return var;
     public double getVar1()
          return var1;
     public double getVar2()
          return var2;
     public String toString()
          return file1+"          "+file2+"          "+var+"          "+var1+"          "+var2;
     public int compareTo(Object o)
          ResultData r= (ResultData)o;
          double result = this.getVar()- r.getVar();
          if (result < 0.0)         return -1;
          else if(result > 0.0)     return 1;
          else return 0;
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Sun C++ std::sort coredump during sorting array of long values

Hello,
I got core dump during execution following test program on both Solaris 9 (compile by CC: Sun C++ 5.5 Patch 113817-19 2006/10/13) and Solaris 10 platforms (compile by CC: Sun C++ 5.9 SunOS_sparc Patch 124863-01 2007/07/25).
Core is dumped during sorting array of about 120k elements of unsigned long types using STL std:sort. The input data is available at link: [file.txt|http://www.savefile.com/files/1924004]
When I change sorting methods to std::stable_sort program works fine.
The funny thing is that when I change order of last two values of input data (swap), sorting is successful with std::sort.
Can anyone tell me if it is Sun C++ compiler bug ?Can I use std::stable_sort method safely?
Below code:
#include <iostream.h>
#include <fstream.h>
#include <set>
#include <string>
int main( int argc, char** argv )
char readStr[256];
ifstream file;
unsigned long *l;
int i=0;
l = new unsigned long[119016];
if (l ==0)
    cout << "Error in allocate memory";
    return -1;
file.open("file.txt");
if (!file)
    cout << "Error in openening file";
    return -1;
while(file.getline(readStr, 256,'\n'))
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    l= atol(readStr);
cout << l[i]<<endl;
i++;
std::sort(l,l+119016); //core dump here!!!
for (i=0;i<119016;i++)
cout <<l[i]<<endl;
file.close();
delete [] l;
return( 0 );
Greetings
Robert

You have run into bug 6588033 "std::sort from libCstd loops", which is fixed in current patches.
Get the current patches for Sun Studio and also the current patch for the C++ runtime libraries (SUNWlibC patch).
You can find them here:
[http://developers.sun.com/sunstudio/downloads/patches/index.jsp]
Sun C++ 5.5 probably does not have the fix, since it is quite old and falling out of support.
C++ 5.9 does have the fix.

Methods, sorting, array

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A study of this would help
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1. Know what is functions
2.Learn how to create them
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CompareTo and Sorting Arrays

I am trying to sort an array of telephone directory information by last, first names, but am having trouble understanding how to use the compareTo method to do so. I thought I could use Arrays.sort, but this doesn't seem to work....any help would be appreciated.
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Actual words/phrases I've seen used which I hate with every fiber of my being:
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One of my favorite SNL skits had Will Ferrell leading a panel of movie reviewers (they're the worst for this kind of junk). Each one had some cheesy pun to describe their respective movie. Ferrell topped the show off with his endorsement of "Fantasia 2000 is Fantasgreat!"
LOL.
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TreeSet vs Collection.Sort / Array.sort for Strings

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Basically I have a list of Strings, i need to perform the following operations on these Strings
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Thanks a bunch

SpaceShuttle wrote:
Gurus
I am pondering weather to use TreeSet vs the Collections.sort / Array.sort for sorting Strings.
Basically I have a list of Strings, i need to perform the following operations on these Strings
1) Able to list Strings starting with a Prefix
2) Able to list Strings Lexically greater than a String
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Thanks a bunchBig-O wise, there's no difference between sorting a list of N elements or inserting them one by one in a tree-set. Both take O(n*log(n)). But both collections are not well suited for looking up string that start with a certain substring. In that case you had better use a Patricia tree (or Radix tree).
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"Returns" indicator in PO and processing steps

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Can somone please explain or show me where I can find documentation that will show all the steps from creating a PO with the return indicator ticked to finally creating the credit memo. The parts in between, creating deliveries etc are not as clear, any help would be appreciated.
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use this link
http://help.sap.com/erp2005_ehp_03/helpdata/EN/69/1b8550950111d2ac740000e829fbfe/frameset.htm
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Sorting array

I know how to sort the array of strings alpha numerically but my problem is that the numerical values will not follow there corresponding strings
here is the code i am using:
Harold Timmis
[email protected]
Orlando,Fl
*Kudos always welcome
Solved!
Go to Solution.
Attachments:
testingfileIO.vi ‏35 KB

Hi.
It's nice to have "sorting array" icon.
But I have problem with programming similar option. I want to sort my sine samples taken in more periods to just one period.
Beside defining that mycurrent sample should be less than next one, and greater from previous one in one case, I should take in consider that derivation could be positive or negative. While negative derivation, next sample should be less then current and so one.
Can someone help me with programming?
I've extracted the first period, and then I have to go trough each sample and compare him. When logic is well,I get the index and putinsert elemt in array.
I think that I'm having problem with while loops. I don't know where to put them.
I'm attaching VI. beacuse I'm working on Labview 9.0, I'm attaching also a pic.
Thanks in advance.
Attachments:
resampling.vi ‏89 KB
Untitled.jpg ‏135 KB

Sorting array list

can u please give me the source code for:
sorting array list for ascending and descending order

You already have the source code.

Sorting array vs sorting paginated array

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My data comes from mysql > php > xml > Flex into an
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Pass the array collection to the paging system like:
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then assign in repeater:
<mx:Repeater id="slideRepeater"
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OK I have resolved the error by importing the class adGroup. However now I am back to the original problem which is how to sort the DisplayName alphabetically and keep the associated link in tact. I created the class to avoid sorting parellel arrays but I am afraid it solved nothing as I have no idea how to sort the class. I tried just sorting it like an array:
Arrays.sort(bAD.getGroups()but receive the following error:
java.lang.ClassCastException: com.mylbean.adGroup incompatible with java.lang.Comparable
at java.util.Arrays.mergeSort(Arrays.java:1160)
at java.util.Arrays.sort(Arrays.java:1131)
>
I would assume this message is caused because I cannot sort a class array using this method. But being newer to Java I really have no idea how to get the class to sort by DisplayName before displaying to the user.
So at this point the code works fine but how do I display alphabetically? All suggestions are appreciated.

Return indices of sorted array

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