Hi, I've a stack of records where records with the same date has different values, eg: record.date[0] = 2011-12-01 record.value[0] = 10 record.date[1] = 2011-12-01 record.value[1] = 20 record.date[3] = 2011-12-02 record.value[3] = 10 And now I want to summarize the values that are recorded for respective date: sumlist.date[0] = 2011-12-01 sumlist.value[0] = 30 sumlist.date[1] = 2011-12-02 sumlist.value[1] = 10
I suppose I should use "filter" and "sum", but I don't know how. Any ideas? Thanks in advance for help!
