Hp 50g Graphing Calculator Manual do Utilizador descarregar pdf (Página 90)

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101

Page 2-30

To see the corresponding expression in the line editor, press ‚— and the

A soft menu key, to show:

This expression shows the general form of a summation typed directly in the

stack or line editor:

Σ(index = starting_value, ending_value, summation expression)

Press ` to return to the Equation Writer. The resulting screen shows the value

of the summation,

To recover the unevaluated summation use ‚¯. To evaluate the

summation again, you can use the D soft menu key. This shows again that

You can use the Equation Writer to prove that

This summation (representing an infinite series) is said to diverge.

Double summations are also possible, for example:

Derivatives

We will use the Equation Writer to enter the following derivative:

Press ‚O to activate the Equation Writer. Then press ‚¿to enter the

(partial) derivative sign. Notice that the sign, when entered into the Equation

Writer screen, provides input locations for the expression being differentiated

∑

∞

+∞=

∑

∞

)(

δβα

+⋅+⋅ tt

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 886 887

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