how to get the variable that is based on cumulative sum of pervious rows and current row?

[ZRick]

hi all,

data t;

input m;

cards;

5

4

11

;

data t2;

set t;

k=m+;

output;

run;

I want result like this:

m k

5  5

4  9

11 20

[Linlin]

data t;

input m;

cards;

5

4

11

;

data want;

  set t;

  retain k;

  k+m;

run;

proc print;run;

Linlin

[ZRick]

what is the purpose of retain statement?

Is K initially assume as zero?

Should I do following if I want to initial k value other than zero?

data want;

  set t;

     k=2.4;

  retain k;

  k+m;

run;

[MikeZdeb]

hi ... if you don't want to set an initial value, you can skip the RETAIN statement since a SUM statement (K+M) implies retain and starts with an initial value of 0

if you want to set an initial value ... RETAIN K 2.4;

ps http://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000289454.htm