Sum Without Range Variables
Keystroke: [Ctrl] [Shift] 4
Returns the sum of the expression X as i goes from m to n .
Operands:
i is any Mathcad variable name.
X is any expression producing a value for each
element in i .
m and n are integers,
n > m. The acceptable range of values depends on the size of X
and the ORIGIN of the worksheet.
If the summand has several terms, enclose them in parentheses to keep
them inside the summation operator.
Notes:
To sum over a vectorized expression, or use an explicit
range index, use other summation
operators .
The variable i is defined
only within the summation operator and has no effect on, nor is influenced
by, variable definitions outside the summation operator.