lotus formula to find all numbers between two numbers - formula

Question

Ive got two fields that calculate the week number of two dates start date and end date. So I have two field called FirstWeek and LastWeek. I want to find all the numbers between the FirstWeek and LastWeek and put those in another field.
For instance firstweek = 35
lastweek = 39
I want field weeks= 35, 36, 37, 38, 39
Any thoughts would be greatly appreciated. I would like to use formula if at all possible.

Answer 1

In #Formula language you also have For loop. If you have number field firstweek and number field lastweek you can create number field weeks, my advice is that this is a multivalue field, and try this formula:
REM {firstweek_date is the date field from which you are calculating the value of firstweek number};
year_firstweek := #Year(firstweek_date);
REM {lastweek_date is the date field from which you are calculating the value of lastweek number};
year_lastweek :=#Year(lastweek_date);
REM {if the year diff is one then the first value of weeks field is first week};
REM {NOTE: I took that every year has 52 weeks.};
REM {If this is not OK then for number_of_weeks_in_year set the value in a same way as you are doing with firstweek but for date #Date(year_firstweek ; 12 ; 31 ).};
REM {If the dates are in same Year then as written before you can use the same logic};
REM {Otherwise I set field week to 0};
#If((year_lastweek-year_firstweek) = 1;
#Do(
FIELD weeks := firstweek;
number_of_weeks_in_year := 52;
#For(n := firstweek+1; n <= number_of_weeks_in_year; n := n + 1;FIELD weeks := weeks:n);
#For(n := 1; n <= lastweek; n := n + 1;FIELD weeks := weeks:n)
);
(year_lastweek-year_firstweek) = 0;
#Do(
FIELD weeks := firstweek;
#For(n := firstweek+1; n <= lastweek; n := n + 1;FIELD weeks := weeks:n)
);
FIELD weeks := 0
)