How to select specific percentage of items from a vector in matlab?











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I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?






matlab







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    Why can't you do n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...
    – Wolfie
    Nov 10 at 12:19










  • @Wolfie thanks it worked, please post it as answer so that I may mark it correct
    – Talha Yousuf
    Nov 10 at 13:32















up vote
0
down vote

favorite












I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?






matlab







share|improve this question


















  • 3




    Why can't you do n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...
    – Wolfie
    Nov 10 at 12:19










  • @Wolfie thanks it worked, please post it as answer so that I may mark it correct
    – Talha Yousuf
    Nov 10 at 13:32













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?






matlab







share|improve this question













I have used datasample() and randsample() to select specific no. of items randomly from a vector. But I have to specify the no. of items explicitly. Is there any way to specify percentage instead?






matlab




matlab






share|improve this question













share|improve this question











share|improve this question




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asked Nov 10 at 12:06









Talha Yousuf

203




203








  • 3




    Why can't you do n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...
    – Wolfie
    Nov 10 at 12:19










  • @Wolfie thanks it worked, please post it as answer so that I may mark it correct
    – Talha Yousuf
    Nov 10 at 13:32














  • 3




    Why can't you do n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...
    – Wolfie
    Nov 10 at 12:19










  • @Wolfie thanks it worked, please post it as answer so that I may mark it correct
    – Talha Yousuf
    Nov 10 at 13:32








3




3




Why can't you do n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...
– Wolfie
Nov 10 at 12:19




Why can't you do n = floor(% * N), where n is the number of items you have to specify, % is the percentage you want, and N is the total number of elements in the vector? This seems pretty straightforward...
– Wolfie
Nov 10 at 12:19












@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32




@Wolfie thanks it worked, please post it as answer so that I may mark it correct
– Talha Yousuf
Nov 10 at 13:32












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You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...



n = floor( pct * N );


Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.



You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.






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    up vote
    2
    down vote













    You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...



    n = floor( pct * N );


    Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.



    You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.






    share|improve this answer

























      up vote
      2
      down vote













      You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...



      n = floor( pct * N );


      Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.



      You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.






      share|improve this answer























        up vote
        2
        down vote










        up vote
        2
        down vote









        You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...



        n = floor( pct * N );


        Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.



        You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.






        share|improve this answer












        You can very easily convert between the percentage of data you want, and the number which is required by the functions you want to use...



        n = floor( pct * N );


        Where n is the number of items you have to specify, pct is the percentage you want to input (between 0 and 1), and N is the total number of elements in the vector.



        You could use a different rounding function to floor (ceil/round), but floor is a good go-to so that you protect against requesting n > N elements due to numerical error or otherwise.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 10 at 13:37









        Wolfie

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