Для тех, кто хочет периодически отправлять запрос на сервер, это моё решение. Вы должны иметь это в своей деятельности или деятельности фрагмента
{
private static final Long UPDATE_LOCATION_TIME = 30 * 60 * 1000l; // 30 minute
private AlarmManager alarm;
private PendingIntent pIntent;
...
@Override
protected void onResume() {
super.onResume();
// Run background service in order to update users location
startUserLocationService();
Log.e(TAG, "onResume");
}
@Override
protected void onStop() {
super.onStop();
stopUserLocationService();
Log.e(TAG, "onStop");
}
private void startUserLocationService() {
Log.i(TAG, "Starting service...");
Intent intent = new Intent(MainFragmentHolder.this, ServiceUserLocation.class);
pIntent = PendingIntent.getService(this, 0, intent, 0);
alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
Calendar cal = Calendar.getInstance();
alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), UPDATE_LOCATION_TIME, pIntent);
}
private void stopUserLocationService() {
alarm.cancel(pIntent);
Intent intent = new Intent(MainFragmentHolder.this, ServiceUserLocation.class);
stopService(intent);
}
}
data test;
input person var;
datalines;
1 5
1 10
1 12
1 20
2 1
2 3
2 5
2 90
;
run;
data test;
set test;
by person notsorted;
retain pos;
array diffs{*} diff0-diff3;
retain diff0-diff3;
if first.person then do;
pos = 0;
end;
pos + 1;
diffs{pos} = dif(var);
if last.person then output;
drop var diff0 pos;
run;
Альтернативный подход без массивов .
/*-- Data from simonn's answer --*/
data SO1019005;
input person var;
datalines;
1 5
1 10
1 12
1 20
2 1
2 3
2 5
2 90
;
run;
/*-- Why not just do a transpose? --*/
proc transpose data=SO1019005 out=NewData;
by person;
run;
/*-- Now calculate your new vars --*/
data NewDataWithVars;
set NewData;
NewVar1 = Col2 - Col1;
NewVar2 = Col3 - Col2;
Newvar3 = Col4 - Col3;
run;
Почему бы не использовать функцию задержки.
data test; input person var;
cards;
1 5
1 10
1 12
1 20
2 1
2 3
2 5
2 90
run;
data test; set test;
by person;
LagVar=Lag(Var);
difference=var-Lagvar;
if first.person then difference=.;
run;
Почему бы вместо этого не использовать функцию diff ()?
/* test data */
data one;
do id = 1 to 2;
do v = 1 to 4 by 1;
output;
end;
end;
run;
/* check */
proc print data=one;
run;
/* on lst
Obs id v
1 1 1
2 1 2
3 1 3
4 1 4
5 2 1
6 2 2
7 2 3
8 2 4
*/
/* now create diff within id */
data two;
set one;
by id notsorted; /* assuming already in order */
dif = ifn(first.id, ., dif(v));
run;
proc print data=two;
run;
/* on lst
Obs id v dif
1 1 1 .
2 1 2 1
3 1 3 1
4 1 4 1
5 2 1 .
6 2 2 1
7 2 3 1
8 2 4 1
*/
data output_data;
retain count previous_value diff1 diff2 diff3;
set data input_data
by person;
if first.person then do;
count = 0;
end;
else do;
count = count + 1;
if count = 1 then diff1 = abs(value - previous_value);
if count = 2 then diff2 = abs(value - previous_value);
if count = 3 then do;
diff3 = abs(value - previous_value);
output output_data;
end;
end;
previous_value = value;
run;