# TI-BASIC:Sum

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Jump to navigationJump to search**Command Summary**

Calculates the sum of all or part of a list.

**Command Syntax**

sum(*list*[,*start*,[*end*

**Menu Location**

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|location=Press:

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

|compatibility=TI-83/84/+/SE |size=1 byte ]]

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.