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The prod( Command

Command Summary Command Syntax Calculator Compatibility Token Size
Calculates the product of all or part of a list. prod(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. 6 to select prod(, or use arrows and ENTER.

The prod( Command

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

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

prod({1,2,3,4,5})
    120
prod({1,2,3,4,5},2,4)
    24
prod({1,2,3,4,5},3)
    60

Optimization

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

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

Error Conditions

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