TI-BASIC:Sum
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Command Summary
Calculates the sum of all or part of a list.
Command Syntax
sum(list[,start,[end
Menu Location
{{{location}}}
{{{compatibility}}}
{{{size}}}
)
|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.
