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array for sumproduct across variables

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Occasional Contributor
Posts: 16
Accepted Solution

array for sumproduct across variables

Need help to finish the below code to get sumproduct with arrays. Thanks

data test;

  array xvals{1:1000} _TEMPORARY_;

    array yvals{1:1000} _TEMPORARY_;


  do i=1 to 1000;

    sumproduct=sum(of xvals(i)*yvals(i)); /* I am stuck here ???*/

  end;

run;


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Solution
‎02-13-2014 06:47 PM
Occasional Contributor
Posts: 16

Re: array for sumproduct across variables

Thanks Reeza. Finally I came up with the below solution to have sum product for all 1000 values (variables in case of my dataset). This is same as excel sumproduct with few lines of SAS code. Kudos !!!

%macro vals;

%do i = 1 %to 1000;

&i

%end;

%mend;

data test;

  array xvals{1000} _TEMPORARY_ (%vals);

array yvals{1000} _TEMPORARY_ (%vals);

sumproduct = 0;

  do i=1 to 1000;

  sumproduct= sum(sumproduct, (xvals(i)*yvals(i)));

end;

run;

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All Replies
Super User
Posts: 17,824

Re: array for sumproduct across variables

You're not retaining anything between loop iterations, so the value you're getting, summing it doesn't error out, is the last summation.

This assumes that you want the sum of xvals(i)*yvals(i) and not something else.

data test;

       array xvals{1:1000} _TEMPORARY_;

    array yvals{1:1000} _TEMPORARY_;

sumproduct=0;


  do i=1 to 1000;

    sumproduct=sumproduct+xvals(i)*yvals(i); /* I am stuck here ???*/

  end;

run;

Occasional Contributor
Posts: 16

Re: array for sumproduct across variables

Thanks Reeza. I tried that but still end result of sumproduct didn't give the expected result. started with 3 values, instead of 1000 and expected result for sumproduct is 14 =  (1*1) + (2*2) + (3*3 )  which isn't coming with this code

data test;

       array xvals{1:3} _TEMPORARY_;

    array yvals{1:3} _TEMPORARY_;

sumproduct=0;


  do i=1 to 3;

    sumproduct=sumproduct+xvals(i)*yvals(i);

  end;

run;

Super User
Posts: 17,824

Re: array for sumproduct across variables

Where do you put the values in the array?

Respected Advisor
Posts: 3,777

Re: array for sumproduct across variables

You need to give XVALS and YVALS some values.

Super User
Posts: 17,824

Re: array for sumproduct across variables

data test;

       array xvals{1:3} _TEMPORARY_ (1:3);

    array yvals{1:3} _TEMPORARY_ (1:3);

sumproduct=0;

  do i=1 to dim(xvals);

    sumproduct=sumproduct+xvals(i)*yvals(i);

  end;

run;

Solution
‎02-13-2014 06:47 PM
Occasional Contributor
Posts: 16

Re: array for sumproduct across variables

Thanks Reeza. Finally I came up with the below solution to have sum product for all 1000 values (variables in case of my dataset). This is same as excel sumproduct with few lines of SAS code. Kudos !!!

%macro vals;

%do i = 1 %to 1000;

&i

%end;

%mend;

data test;

  array xvals{1000} _TEMPORARY_ (%vals);

array yvals{1000} _TEMPORARY_ (%vals);

sumproduct = 0;

  do i=1 to 1000;

  sumproduct= sum(sumproduct, (xvals(i)*yvals(i)));

end;

run;

Respected Advisor
Posts: 3,777

Re: array for sumproduct across variables

What is the purpose of the ARRAYS?  You are summing i*i.

☑ This topic is SOLVED.

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