我已经使用称为Stopwatch sw = Stopwatch.StartNew();
String all = Watch.Roll()
.TakeWhile( _ => sw.ElapsedTicks < 10000 )
.Select( i => i.ToString() )
.Aggregate(
new StringBuilder(),
( s, sb ) => sb.Append( s ).Append(", "),
sb => sb.ToString()
);
Console.WriteLine( all ):
的数据透视模型手动设计了data dup;
set adhb; by id ass_yr ass_mth fields;
if first.ass_mth and last.ass_mth then delete;
run;
#Dataset relates to Health Records
ass_mth-assessment month
ass_year--assessment year
fields-just to mention how many fields used
id --character field
Rest of the variables are numeric
# R code
adhb<-arrange(adhb,adhb$NHI,adhb$Ass_yr,adhb$Ass_mth,adhb$fields)
x %>% group_by(adhb$NHI,adhb$Ass_yr,adhb$Ass_mth,adhb$fields) %>%
filter(duplicated(adhb$Ass_mth))
模型和Clothes模型之间的多对多关系，例如：
Seasons如何定义一个函数，使我可以对一个或多个季节的衣服进行过滤（如果可能的话，我希望同时具有AND和OR，如Clothes2Seasons中所述。）