II. Menu Keys - Keys that offer choices

J. LIST

3. OPS (operations)

The LIST OPS (operations menu) has 19 choices. It is accessed by pressing . The items covered on this site are the ones that you will most likely encounter in algebra, trigonometry, or calculus.

 

1. dimL list : shows the number of items in a list.



(or any list)

You can also create a list or redefine a list with a specified number of items, all of which will have the default value of 0.

8

NEW

2. sortA list : will sort a list in ascending order.

3. sortD list : will sort a list in descending order.

Example: Create a list called SORT with the values 12,10,8,1,6,9 in the list. Then sort the list in ascending order and then in descending order.

Create the list
SORT.
Clear the screen.
Press


(location of SORT)
Clear the screen.
Press


(location of SORT)

4. min (list) : returns the minimum value in a list.

5. max (list) : returns the maximum value in a list.

Example: Find the minimum and maximum values in the list SORT.

Press

(location of SORT)
Press

(location of SORT)

6. sum list : returns the sum of all the items in a list.

7. prod list : returns the product of all the items in a list.

Example: Find the sum product of the items in the list LSU.

Press

(location of LSU)
Press

(location of LSU)

8. seq(expression, variable, begin, end, (step)): returns a list of numbers defined by a mathematical expression. After defining the expression, and entering the variable, you will enter a starting value and an ending value. There is also an option of entering the increments (step) of the variable used. The value of step can be negative.

Sequences are a topic of study in calculus. The TI-86 will list the terms in a defined sequence.

Example: Find the first 6 terms of the sequence . Note that the variable x is used instead of an n. The name of the variable is not important as long as you use the same one. The proper way to enter a sequence is: seq(definition, variable, starting value, ending value, increment). If no increment is listed, the default is 1. For this example we have: seq(2x-1,x,1,6,1), which will start the sequence at 1 and give 6 values in increments of 1.

Press

(2x-1,x,1,6,1)

9. li>vc list : converts a list to a vector. You can also use the notation li>vc {element1, element2, ...} .

10. vc>li list : converts a vector to a list. You can also use the notation vc>li{element1, element2,...}

11. Fill(number, listName) : stores the value given to every element in the list named.

12. aug(listA,listB): concatenates the elements in listA and listB.

13. cSum(list): returns the list of cumulative sums of the elements in the list.

Example: Find the cumulative sum of the elements in the sequence .

Series is a topic covered in calculus, especially infinite series. To find the value of a series, you can use the sum and sequence together.

Example: Find by using sum and seq.

1. Create
2. EDIT
3. OPS
4. Using Lists

 

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