The sum( Command

Command Summary

Calculates the sum of all or part of a list.

Command Syntax

sum(list[,start,[end]])

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.

TI-83/84/+/SE

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.

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