I have two data sets. One is automatically generated with a time stamp every second. The other is field notes of the time where a load is observed to begin, thus establishing a control point. I want to assign all points after that control point its load number until the next control point.
can anyone suggest a simple way to do this?
in essence I need the following
seconds | control point | load number |
12566 | 0 | . |
12567 | 0 | . |
12568 | 0 | . |
12569 | 1 | 1 |
12570 | 0 | . |
12571 | 0 | . |
12572 | 0 | . |
12573 | 0 | . |
12574 | 0 | . |
12575 | 0 | . |
12576 | 0 | . |
12577 | 0 | . |
12578 | 0 | . |
12579 | 0 | . |
12580 | 0 | . |
12581 | 0 | . |
12582 | 1 | 2 |
12583 | 0 | . |
12584 | 0 | . |
12585 | 0 | . |
12586 | 0 | . |
12587 | 0 | . |
12588 | 0 | . |
to become this
seconds | control point | load number |
12566 | 0 | . |
12567 | 0 | . |
12568 | 0 | . |
12569 | 1 | 1 |
12570 | 0 | 1 |
12571 | 0 | 1 |
12572 | 0 | 1 |
12573 | 0 | 1 |
12574 | 0 | 1 |
12575 | 0 | 1 |
12576 | 0 | 1 |
12577 | 0 | 1 |
12578 | 0 | 1 |
12579 | 0 | 1 |
12580 | 0 | 1 |
12581 | 0 | 1 |
12582 | 1 | 2 |
12583 | 0 | 2 |
12584 | 0 | 2 |
12585 | 0 | 2 |
12586 | 0 | 2 |
12587 | 0 | 2 |
12588 | 0 | 2 |
Aha!
data b (drop=loadx);
set a;
retain loadx;
if not missing(load) then loadx = load;
load = loadx;
run;
maybe someone can explain what "(drop=loadx)" is doing
that is not my common usage of "retain" which I've always used to reorder columns.
retain control_point 0;
if load_number ne . then control_point=load_number;
And thank you for that as well... I'll try it.
Aha!
data b (drop=loadx);
set a;
retain loadx;
if not missing(load) then loadx = load;
load = loadx;
run;
maybe someone can explain what "(drop=loadx)" is doing
that is not my common usage of "retain" which I've always used to reorder columns.
drops it from the final data set.
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