Hp 49g+ User Manual download pdf (Page 61)

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This latter result is purely numerical, so that the two results in the stack,

although representing the same expression, seem different. To verify that they

are not, we subtract the two values and evaluate this difference using function

EVAL:

- Subtract level 1 from level 2

µ Evaluate using function EVAL

The result is zero (0.).

Note: Avoid mixing integer and real data to avoid conflicts in the

calculations. For many physical science and engineering applications,

including numerical solution of equation, statistics applications, etc., the

APPROX mode (see Appendix C) works better. For mathematical

applications, e.g., calculus, vector analysis, algebra, etc., the EXACT mode is

preferred. Become acquainted with operations in both modes and learn how

to switch from one to the other for different types of operations (see Appendix

C).

Editing arithmetic expressions

Suppose that we entered the following expression, between quotes, with the

calculator in RPN mode and the CAS set to EXACT:

rather than the intended expression:

5.7

−

⋅

. The incorrect expression

was entered by using:

³5*„Ü1+1/1.75™/„Ü

R5-2Q3`

To enter the line editor use „˜. The display now looks as follows:

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 861 862

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Hp 49g+ User Manual Page 61

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