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nash_sas
Fluorite | Level 6

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;

1 ACCEPTED SOLUTION

Accepted Solutions
nash_sas
Fluorite | Level 6

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;

View solution in original post

7 REPLIES 7
Reeza
Super User

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;

nash_sas
Fluorite | Level 6

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;

Reeza
Super User

Where do you put the values in the array?

data_null__
Jade | Level 19

You need to give XVALS and YVALS some values.

Reeza
Super User

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;

nash_sas
Fluorite | Level 6

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;

data_null__
Jade | Level 19

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

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