Initializing boost date to the first year of AD - c++

I would want to initialize a gregorian date like this
boost::gregorian::date d = { 1, 1, 1 };
but year = 1 is not allowed.
How can I create a day before Jesus was born ?

The current implementation of Gregorian date supports dates in the range 1400-Jan-01 to 9999-Dec-31. So handling a date outside this range is no directly possible.

Related

Calculate aggregate value of last 12 months in a Measure Power BI

I'm using this measure to calculate a aggregate sum of a value in the last 12 months. The measure is working well if I start using it from the month 12. But, the problem is, if the month is not in the 12 or higher, the value is not right.
Example, if you are in the first month of the sample, I would like to multiply this value by 12 (1st month + 11 months). If it was the second month, I'd like you to average the two months and multiply it by 12. And so on.
could you please help me?
SumRevenue =
var vSumNet12 =
CALCULATE(
Table[Trevenue],
DATESINPERIOD(
CalendarM[Data],
MAX(CalendarM[Data]),
-12,
MONTH
)
)
return
vSumNet12
Example table:
Date Customer Net Trevenue SumRevenue ROA ROA I Want
09/30/20 A 237767115,6 327444,2478 327444,2478 0,14% 1,65%
10/31/20 A 245689276,3 251934,78 579379,0278 0,24% 1,41%
11/30/20 A 252916933,6 262294,89 841673,9178 0,33% 1,33%
12/31/20 A 241424127 509883,07 1351556,988 0,56% 1,68%
01/31/21 A 244721140,9 259250 1610806,988 0,66% 1,58%
02/28/21 A 250913741,4 246740,33 1857547,318 0,74% 1,48%
03/31/21 A 282215365,7 550897,35 2408444,668 0,85% 1,46%
04/30/21 A 312759343,1 544161,63 2952606,298 0,94% 1,42%
05/31/21 A 325535894 419360,97 3371967,268 1,04% 1,38%
06/30/21 A 371306315 390650,41 3762617,678 1,01% 1,22%
07/31/21 A 379780645,3 527254,43 4289872,108 1,13% 1,23%
08/31/21 A 415390274,9 409196,3 4699068,408 1,13% 1,13%
09/30/21 A 433837730,6 598924,02 4970548,18 1,15% 1,15%
10/31/21 A 482659906,7 254086,32 4972699,72 1,03% 1,03%
11/30/21 A 501568104,7 318924,53 5029329,36 1,00% 1,00%
12/31/21 A 507124350,5 754897,79 5274344,08 1,04% 1,04%
01/31/22 A 510220304,2 179153,11 5194247,19 1,02% 1,02%

LINQ to extract duplicate data more than 3

class Year
{
public int YearNumber;
public List<Month> Months = new List<Month>();
}
class Month
{
public int MonthNumber;
public List<Day> Days = new List<Day>();
}
class Day
{
public int DayNumber;
public string Event;
}
So I have a list of Years(list<year> years). How do I get the list (another list) which have the result that has duplicates event on the same day? I mean events can be happen on multiple dates, does not matter, what matters is, to find out if this any of date happens the same event from different year. . Lastly, (filter) only if its occurs more than 3 times. Example, 5 July 2014, 5 July 2017 and 5 July 2019 is 'Abc Festival', which occurs more than 3 times. So u get the date, the event, and the number of counts.
Using just the classes you show we can only group dates, where a "date" is a day in a month:
var query = from y in years
from m in y.Months
from d in m.Days
select new { m.MonthNumber, d.DayNumber }
into date
group date by date
into dateGroup
where dateGroup.Count() > 2
select dateGroup;
select dateGroup;
As you see, the core solution is to build new { m.MonthNumber, d.DayNumber } objects and group them.

Pyspark: add new column derived from other and with time contition

I have DataFrame #1 with columns A, B, C startyear, endyear With Values:
year B C startyear endyear
2010 2 A 2012 2014
2011 2 A 2010 2013
2013 2 B .. ..
2012 2 C``
I want to create a new column called result
df = df.Withcolumn(...)
Resutt will take into consideration start and end years to compute mean of B for each year between start and en dates
if start date = 2012
end date = 2014
then result will be the mean of the sum of ( B2012 + B2013+B2014) = 2+2+2/3=2
Some advice ?
Thank you
You can use filter with two conditions and then use aggregate function to calculate mean.
df = df.filter((x_df.year >= x_df.start_yr) & (x_df.year <= x_df.end_yr))
df.agg({"B":"mean"})

how to know which quarter does the current month belongs to ? (in python )

I want to know to which quarter(Q1,Q2,Q3,Q4) does the current month belongs to in python. I'm fetching the current date by importing time module as follows:
import time
print "Current date " + time.strftime("%x")
any idea how to do it ?
Modifying your code, I get this:
import time
month = int(time.strftime("%m")) - 1 # minus one, so month starts at 0 (0 to 11)
quarter = month / 3 + 1 # add one, so quarter starts at 1 (1 to 4)
quarter_str = "Q" + str(quarter) # convert to the "Qx" format string
print quarter_str
Or you could use the bisect module:
import time
import bisect
quarters = range(1, 12, 3) # This defines quarters: Q1 as 1, 2, 3, and so on
month = int(time.strftime("%m"))
quarter = bisect.bisect(quarters, month)
quarter_str = = "Q" + str(quarter)
print quarter_str
strftime does not know about quarters, but you can calculate them from the month:
Use time.localtime to retrieve the current time in the current timezone. This function returns a named tuple with year, month, day of month, hour, minute, second, weekday, day of year, and time zone offset. You will only need the month (tm_mon).
Use the month to calculate the quarter. If the first quarter starts with January and ends with March, the second quarter starts with April and ends with June, etc. then this is as easy as dividing by 4 without remainder and adding 1 (for 1..3 // 4 == 0, 0 + 1 == 1, 4..6 // 4 == 1, 1 + 1 == 2, etc.). If your definition of what a quarter is differs (e.g. companies may choose different start dates for their financial quarters), you have to adjust the calculation accordingly.

boost::gregorian::date does not have `set-type` functions?

For example I have a date object:
boost::gregorian::date date1(2013,1,31);
Now I want to change the day to 1. How to set day to 1?
Date types are immutable, apart from assignment, so you need to make a new date:
date1 = boost::gregorian::date(date1.year(), date1.month(), 1);