Is it possible to re-order a List of continuous entries?












3












$begingroup$


I am given a list



a = {1.1,2.1,3.1,4.1,...}


As you can see this is not a list of the form 



{{1.1},{2.1},{3.1},{4.1},...}


Now I was wondering whether it is possible to write a swap function



swap[a,{1,3}]


which would swap the first and third entry such that I get 



{3.1,2.1,1.1,4.1,...}


As a result.



Any help will be greatly appreciated !



If it is not possible please just tell me then I'll start looking for other ways to approach this problem.






list-manipulation







share|improve this question











$endgroup$












  • $begingroup$
    I do not understand is this statement: "So I cannot target single entries using a command like [...]". Moroever, please adopt the habit of positing complete minimal examples. Mentioning the symbol MinVarGeneralThermal1 is totally irrelevant for the problem at hand, isn't it? You question is merely about reording a given list.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:09












  • $begingroup$
    You are right, I corrected the name of the function. What I meant with 'function1[T, E, d][[2]]' is that this allows to target a single entry of a list, which would correspond to {2.1} in my example
    $endgroup$
    – CatoMaths
    Feb 19 at 11:16










  • $begingroup$
    I took the freedom to modify your post in order to remove the function. Please check whether this is in accordance with your actual question. Also, please rephrase the part "So I cannot target single entries using a command like [...]" because I still don't get what you are asking for.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:20










  • $begingroup$
    Oh well, this statement was written to help the readers understand my issue. But it is not necessary to understand the problem by any means. I will delete it. And thank you for the edit !
    $endgroup$
    – CatoMaths
    Feb 19 at 11:33












  • $begingroup$
    Dupe of 191781?
    $endgroup$
    – Rabbit
    Feb 19 at 17:14
















3












$begingroup$


I am given a list



a = {1.1,2.1,3.1,4.1,...}


As you can see this is not a list of the form 



{{1.1},{2.1},{3.1},{4.1},...}


Now I was wondering whether it is possible to write a swap function



swap[a,{1,3}]


which would swap the first and third entry such that I get 



{3.1,2.1,1.1,4.1,...}


As a result.



Any help will be greatly appreciated !



If it is not possible please just tell me then I'll start looking for other ways to approach this problem.






list-manipulation







share|improve this question











$endgroup$












  • $begingroup$
    I do not understand is this statement: "So I cannot target single entries using a command like [...]". Moroever, please adopt the habit of positing complete minimal examples. Mentioning the symbol MinVarGeneralThermal1 is totally irrelevant for the problem at hand, isn't it? You question is merely about reording a given list.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:09












  • $begingroup$
    You are right, I corrected the name of the function. What I meant with 'function1[T, E, d][[2]]' is that this allows to target a single entry of a list, which would correspond to {2.1} in my example
    $endgroup$
    – CatoMaths
    Feb 19 at 11:16










  • $begingroup$
    I took the freedom to modify your post in order to remove the function. Please check whether this is in accordance with your actual question. Also, please rephrase the part "So I cannot target single entries using a command like [...]" because I still don't get what you are asking for.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:20










  • $begingroup$
    Oh well, this statement was written to help the readers understand my issue. But it is not necessary to understand the problem by any means. I will delete it. And thank you for the edit !
    $endgroup$
    – CatoMaths
    Feb 19 at 11:33












  • $begingroup$
    Dupe of 191781?
    $endgroup$
    – Rabbit
    Feb 19 at 17:14














3












3








3





$begingroup$


I am given a list



a = {1.1,2.1,3.1,4.1,...}


As you can see this is not a list of the form 



{{1.1},{2.1},{3.1},{4.1},...}


Now I was wondering whether it is possible to write a swap function



swap[a,{1,3}]


which would swap the first and third entry such that I get 



{3.1,2.1,1.1,4.1,...}


As a result.



Any help will be greatly appreciated !



If it is not possible please just tell me then I'll start looking for other ways to approach this problem.






list-manipulation







share|improve this question











$endgroup$




I am given a list



a = {1.1,2.1,3.1,4.1,...}


As you can see this is not a list of the form 



{{1.1},{2.1},{3.1},{4.1},...}


Now I was wondering whether it is possible to write a swap function



swap[a,{1,3}]


which would swap the first and third entry such that I get 



{3.1,2.1,1.1,4.1,...}


As a result.



Any help will be greatly appreciated !



If it is not possible please just tell me then I'll start looking for other ways to approach this problem.






list-manipulation




list-manipulation






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Feb 19 at 16:49









Glorfindel

2631311




2631311










asked Feb 19 at 11:02









CatoMathsCatoMaths

274




274












  • $begingroup$
    I do not understand is this statement: "So I cannot target single entries using a command like [...]". Moroever, please adopt the habit of positing complete minimal examples. Mentioning the symbol MinVarGeneralThermal1 is totally irrelevant for the problem at hand, isn't it? You question is merely about reording a given list.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:09












  • $begingroup$
    You are right, I corrected the name of the function. What I meant with 'function1[T, E, d][[2]]' is that this allows to target a single entry of a list, which would correspond to {2.1} in my example
    $endgroup$
    – CatoMaths
    Feb 19 at 11:16










  • $begingroup$
    I took the freedom to modify your post in order to remove the function. Please check whether this is in accordance with your actual question. Also, please rephrase the part "So I cannot target single entries using a command like [...]" because I still don't get what you are asking for.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:20










  • $begingroup$
    Oh well, this statement was written to help the readers understand my issue. But it is not necessary to understand the problem by any means. I will delete it. And thank you for the edit !
    $endgroup$
    – CatoMaths
    Feb 19 at 11:33












  • $begingroup$
    Dupe of 191781?
    $endgroup$
    – Rabbit
    Feb 19 at 17:14


















  • $begingroup$
    I do not understand is this statement: "So I cannot target single entries using a command like [...]". Moroever, please adopt the habit of positing complete minimal examples. Mentioning the symbol MinVarGeneralThermal1 is totally irrelevant for the problem at hand, isn't it? You question is merely about reording a given list.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:09












  • $begingroup$
    You are right, I corrected the name of the function. What I meant with 'function1[T, E, d][[2]]' is that this allows to target a single entry of a list, which would correspond to {2.1} in my example
    $endgroup$
    – CatoMaths
    Feb 19 at 11:16










  • $begingroup$
    I took the freedom to modify your post in order to remove the function. Please check whether this is in accordance with your actual question. Also, please rephrase the part "So I cannot target single entries using a command like [...]" because I still don't get what you are asking for.
    $endgroup$
    – Henrik Schumacher
    Feb 19 at 11:20










  • $begingroup$
    Oh well, this statement was written to help the readers understand my issue. But it is not necessary to understand the problem by any means. I will delete it. And thank you for the edit !
    $endgroup$
    – CatoMaths
    Feb 19 at 11:33












  • $begingroup$
    Dupe of 191781?
    $endgroup$
    – Rabbit
    Feb 19 at 17:14
















$begingroup$
I do not understand is this statement: "So I cannot target single entries using a command like [...]". Moroever, please adopt the habit of positing complete minimal examples. Mentioning the symbol MinVarGeneralThermal1 is totally irrelevant for the problem at hand, isn't it? You question is merely about reording a given list.
$endgroup$
– Henrik Schumacher
Feb 19 at 11:09






$begingroup$
I do not understand is this statement: "So I cannot target single entries using a command like [...]". Moroever, please adopt the habit of positing complete minimal examples. Mentioning the symbol MinVarGeneralThermal1 is totally irrelevant for the problem at hand, isn't it? You question is merely about reording a given list.
$endgroup$
– Henrik Schumacher
Feb 19 at 11:09














$begingroup$
You are right, I corrected the name of the function. What I meant with 'function1[T, E, d][[2]]' is that this allows to target a single entry of a list, which would correspond to {2.1} in my example
$endgroup$
– CatoMaths
Feb 19 at 11:16




$begingroup$
You are right, I corrected the name of the function. What I meant with 'function1[T, E, d][[2]]' is that this allows to target a single entry of a list, which would correspond to {2.1} in my example
$endgroup$
– CatoMaths
Feb 19 at 11:16












$begingroup$
I took the freedom to modify your post in order to remove the function. Please check whether this is in accordance with your actual question. Also, please rephrase the part "So I cannot target single entries using a command like [...]" because I still don't get what you are asking for.
$endgroup$
– Henrik Schumacher
Feb 19 at 11:20




$begingroup$
I took the freedom to modify your post in order to remove the function. Please check whether this is in accordance with your actual question. Also, please rephrase the part "So I cannot target single entries using a command like [...]" because I still don't get what you are asking for.
$endgroup$
– Henrik Schumacher
Feb 19 at 11:20












$begingroup$
Oh well, this statement was written to help the readers understand my issue. But it is not necessary to understand the problem by any means. I will delete it. And thank you for the edit !
$endgroup$
– CatoMaths
Feb 19 at 11:33






$begingroup$
Oh well, this statement was written to help the readers understand my issue. But it is not necessary to understand the problem by any means. I will delete it. And thank you for the edit !
$endgroup$
– CatoMaths
Feb 19 at 11:33














$begingroup$
Dupe of 191781?
$endgroup$
– Rabbit
Feb 19 at 17:14




$begingroup$
Dupe of 191781?
$endgroup$
– Rabbit
Feb 19 at 17:14










1 Answer
1






active

oldest

votes


















4












$begingroup$

a = {1.1, 2.1, 3.1, 4.1};



swap[a_, {i_, j_}] := Module[{b = a},

  b[[{j, i}]] = b[[{i, j}]];

  b

  ]



swap[a, {3, 1}]



{3.1, 2.1, 1.1, 4.1}




Alternatively, you may also use ReplacePart as follows:



swap[a_, {i_, j_}] := ReplacePart[a, {i -> a[[j]], j -> a[[i]]}]





share|improve this answer









$endgroup$













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    1 Answer
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    1 Answer
    1






    active

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    active

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    active

    oldest

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    4












    $begingroup$

    a = {1.1, 2.1, 3.1, 4.1};
    

    
swap[a_, {i_, j_}] := Module[{b = a},
    
  b[[{j, i}]] = b[[{i, j}]];
    
  b
    
  ]
    

    
swap[a, {3, 1}]



    {3.1, 2.1, 1.1, 4.1}




    Alternatively, you may also use ReplacePart as follows:



    swap[a_, {i_, j_}] := ReplacePart[a, {i -> a[[j]], j -> a[[i]]}]





    share|improve this answer









    $endgroup$


















      4












      $begingroup$

      a = {1.1, 2.1, 3.1, 4.1};
      

      
swap[a_, {i_, j_}] := Module[{b = a},
      
  b[[{j, i}]] = b[[{i, j}]];
      
  b
      
  ]
      

      
swap[a, {3, 1}]



      {3.1, 2.1, 1.1, 4.1}




      Alternatively, you may also use ReplacePart as follows:



      swap[a_, {i_, j_}] := ReplacePart[a, {i -> a[[j]], j -> a[[i]]}]





      share|improve this answer









      $endgroup$
















        4












        4








        4





        $begingroup$

        a = {1.1, 2.1, 3.1, 4.1};
        

        
swap[a_, {i_, j_}] := Module[{b = a},
        
  b[[{j, i}]] = b[[{i, j}]];
        
  b
        
  ]
        

        
swap[a, {3, 1}]



        {3.1, 2.1, 1.1, 4.1}




        Alternatively, you may also use ReplacePart as follows:



        swap[a_, {i_, j_}] := ReplacePart[a, {i -> a[[j]], j -> a[[i]]}]





        share|improve this answer









        $endgroup$



        a = {1.1, 2.1, 3.1, 4.1};
        

        
swap[a_, {i_, j_}] := Module[{b = a},
        
  b[[{j, i}]] = b[[{i, j}]];
        
  b
        
  ]
        

        
swap[a, {3, 1}]



        {3.1, 2.1, 1.1, 4.1}




        Alternatively, you may also use ReplacePart as follows:



        swap[a_, {i_, j_}] := ReplacePart[a, {i -> a[[j]], j -> a[[i]]}]






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Feb 19 at 11:55









        Henrik SchumacherHenrik Schumacher

        55.1k475154




        55.1k475154






























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