MSUM returns the monthly sum (total) of a specified variable.

SYNTAX:

MSUM(Cx, optional Time Increment)
where :
Cx is a conditional variable x
Time Increment Optional - specifies the source variables (Cx) Frequency when the Source Variable (CX) and target variable's (i.e. the variable being calculated) frequencies do not match.

NOTES:

The variable to be summed must be specified as a Conditional Variable (use "C" instead of "V")

The result is stored based on target variables frequency: 

• Daily - Last day of the month.
• Daily Detail - First slot on the last day of the month.
  

EXAMPLE 1: Return the Monthly sum from a variable

Source variable (70) is set to Daily and Target variable (120) is also set to Daily. Because both the Source and Target variables are the same (Daily), the time increment BYDAY will be used.  

V120 = MSUM(C70)

Variable 120 will contain the total of all values in vairable 70

EXAMPLE 2: Return the Monthly sum from an Hourly variable into a Daily Calculation.

Source variable (70) is set to Hourly and Target variable (120) is set to Daily. 

V70 - Is a hourly parameter
V120 - Is a daily calculation

V120 = MSUM(V70,BYHOUR)

Note: You MUST specify the Time Increment (BYHOUR) that matches the source variables frequency (IE the source variable V70 is Hourly, therefore we specify BYHOUR) in order for the function to return the correct value.

See: Working with Daily Detail Variables in Calculations.