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The sum( Command

Command Summary Command Syntax Calculator Compatibility Token Size
Calculates the sum of all or part of a list. sum(list[,start,[end]]) TI-83/84/+/SE 1 byte

Press:
1. 2nd LIST to access the list menu.
2. LEFT to access the MATH submenu.
3. 5 to select sum(, or use arrows and ENTER.

The sum( Command

The sum( command calculates the sum of all or part of a list.

When you use it with only one argument, the list, it sums up all the elements of the list. You can also give it a bound of start and end and it will only sum up the elements starting and ending at those indices (inclusive).

sum({1,2,3,4,5})
    15
sum({1,2,3,4,5},2,4)
    9
sum({1,2,3,4,5},3)
    12

Optimization

If the value of end is the last element of the list, it can be omitted: 

sum({1,2,3,4,5},3,5)
can be
sum({1,2,3,4,5},3)

Error Conditions

  • ERR:DOMAIN is thrown if the starting or ending value aren't positive integers.
  • ERR:INVALID DIM is thrown if the starting or ending value exceed the size of the list, or are in the wrong order.
Authors: KG