CASTI-89 TITANIUM · CALC89
Σ(
Computes the sum of an expression as the variable runs from a lower to an upper value. Used for sigma notation and series in class.
Syntax
Σ(expr, var, low, high)
- Group
- Calculus
- Arguments
- Takes the expression, the index variable, and the lower and upper value.
- Availability
- Pro feature in Calc89
- Menu path
- F3 Calc ▸ Σ(
Example
| Input | Result |
|---|---|
| Σ(k,k,1,10) | 55 |
Typing Σ(k,k,1,10) on the home screen and pressing ENTER returns 55.
Keystrokes on the TI-89 Titanium
F34
The same key sequence inserts Σ( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- ∫(Integrates an expression with respect to a variable.
- arcLen(Returns the arc length of the graph of an expression between two values of the variable.
- d(Differentiates an expression symbolically with respect to a variable.
- deSolve(Solves first and second order ordinary differential equations symbolically.
- dominantTerm(Returns the term of an expression that dominates near a point, for example as the variable tends to infinity.
- euler(Solves a differential equation numerically with Euler's method and returns a matrix with the variable values in the first row and the solution values in the second.
- fMax(Returns the value of the variable at which an expression reaches its maximum, as a condition such as x=1.
- fMin(Returns the value of the variable at which an expression reaches its minimum, as a condition such as x=2.