HP 40gs Manual de usuario descargar pdf (Pagina 269)

100

101

Equation Writer 15-17

• MODULO contains the value of p for performing

symbolic calculations in Z/pZ or in Z/pZ[X]. You can

change the value of p either with the MODSTO

command on the MODULAR menu, (by typing, for

example, MODSTO(n) to give p a value of n), or from

CAS MODES screen (see page 14-5).

• PERIOD must contain the period of a function before

you can find its Fourier coefficients.

• PRIMIT contains the primitive of the last integrated

function.

• REALASSUME contains a list of the names of the

symbolic variables that are considered reals. If you’ve

chosen the Cmplx vars option on the CFG

configuration menu, the defaults are X, Y, t, S1 and

S2, as well as any integration variables that are in

use.

If you’ve chosen the Real vars option on the CFG

configuration menu, all symbolic variables are

considered reals. You can also use an assumption to

define a variable such as X >1. In a case like this,

you use the ASSUME(X>1) command to make

REALASSUME contain X>1. The command

UNASSUME(X) cancels all the assumptions you have

previously made about X.

To see these variables, as well as those that you’ve

defined in CAS, press in the Equation Editor

(see “CAS variables” on page 14-4).

The keyboard in the Equation Writer

The keys mentioned in this section have different functions

when pressed in the Equation Writer than when used

elsewhere.

MATH key The key, if pressed in

the Equation Writer, displays

just those functions used in

symbolic calculation. These

functions are contained in

the following menus:

• The five function-containing Equation Writer menus

outlined in the previous section: Algebra (),

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