20021201
2-7-10
Using the Action Menu
uu
uu
u lim
Function: Determines the limit of an expression.
Syntax: lim (Exp/List, variable, point [,direction] [
)
]
Example: To determine the limit of e
–
x
as x approaches ⬁
Menu Item: [Action][Calculation][lim]
Example: To determine the limit of 1/x as x approaches 0 from the right
Menu Item: [Action][Calculation][lim]
uu
uu
u Σ
Function: Evaluates an expression at discrete variable values within a range, and then
calculates a sum.
Syntax: Σ(Exp/List, variable, lower value, upper value [
)
]
Example: To calculate the sum of x
2
as the value of x changes from x = 1 through x =10.
Menu Item: [Action][Calculation][Σ]
Example: To determine the limit of 1/x as x approaches 0 from the left
Menu Item: [Action][Calculation][lim]
• This function returns the limit from the left when “direction” < 0, the limit from the right
when “direction” > 0, and the limit from both sides (left and right) when “direction” = 0 or
when the direction is omitted.
uu
uu
u Π
Function: Evaluates an expression at discrete variable values within a range, and then
calculates a product.
Syntax: Π(Exp/List, variable, lower value, upper value [
)
]
Example: To calculate the product of x
2
as the value of x changes from x = 1 through
x = 5
Menu Item: [Action][Calculation][Π]
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