HP HP12C hp 12c_user's guide_English_E_HDPMBF12E44.pdf - Page 83

Mathematics and, Number-Alteration Functions

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Section 7 Mathematics and Number-Alteration Functions The hp 12c provides several keys for mathematical functions and for altering, numbers. These functions are useful for specialized financial calculations as well as for general mathematics calculations. One-Number Functions Most of the mathematics functions require that only one number be in the calculator (that is, the number in the display) before the function key is pressed. Pressing the function key then replaces the number in the display by the result. Reciprocal. Pressing y calculates the reciprocal of the number in the display - that is, it divides 1 by the number in the display. Square Root. Pressing gr calculates the square root of the number in the display. Logarithm. Pressing g° calculates the natural logarithm (that is, the logarithm to the base e) of the number in the display. To calculate the common logarithm (that is, the logarithm to the base 10) of the number in the display, calculate the natural logarithm, then press 10g°z. Exponential. Pressing g> calculates the exponential of the number in the display - that is, it raises the base e to the number in the display. Factorial. Pressing ge calculates the factorial of the number in the display - that is, it calculates the product of the integers from 1 to n, where n is the number in the display. Round. The display format specifies to how many decimal places a number inside the calculator is rounded when it appears in the display; but the display format alone does not affect the number itself inside the calculator. Pressing fB, however, changes the number inside the calculator to match its displayed version. Thus, to round a number in the display to a given number of decimal places, temporarily set the display format (as described on page 71) to show the desired number of decimal places, then press fB. Integer. Pressing gÑ replaces the number in the display by its integer portion - that is, it replaces each digit to the right of the decimal point by 0. The number is changed inside the calculator as well as in the display. The original number can be recalled to the display by pressing gF. 83 File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 83 of 209 Dimension: 14.8 cm x 21 cm

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83
File name: hp 12c_user's guide_English_HDPMBF12E44
Page: 83 of 209
Printered Date: 2005/7/29
Dimension: 14.8 cm x 21 cm
Section 7
Mathematics and
Number-Alteration Functions
The
hp 12c
provides several keys for mathematical functions and for altering,
numbers. These functions are useful for specialized financial calculations as well as
for general mathematics calculations.
One-Number Functions
Most of the mathematics functions require that only one number be in the
calculator (that is, the number in the display) before the function key is pressed.
Pressing the function key then replaces the number in the display by the result.
Reciprocal.
Pressing
y
calculates the reciprocal of the number in the display —
that is, it divides 1 by the number in the display.
Square Root.
Pressing
gr
calculates the square root of the number in the
display.
Logarithm.
Pressing
g°
calculates the natural logarithm (that is, the
logarithm to the base
e
) of the number in the display. To calculate the common
logarithm (that is, the logarithm to the base 10) of the number in the display,
calculate the natural logarithm, then press 10
g°z
.
Exponential.
Pressing
g>
calculates the exponential of the number in the
display — that is, it raises the base
e
to the number in the display.
Factorial.
Pressing
ge
calculates the factorial of the number in the display —
that is, it calculates the product of the integers from 1 to
n
, where
n
is the number
in the display.
Round.
The display format specifies to how many decimal places a number
inside the calculator is rounded when it appears in the display; but the display
format alone does not affect the number itself inside the calculator. Pressing
fB
, however, changes the number inside the calculator to match its displayed
version. Thus, to round a number in the display to a given number of decimal
places, temporarily set the display format (as described on page 71) to show the
desired number of decimal places, then press
fB
.
Integer.
Pressing
gÑ
replaces the number in the display by its integer
portion — that is, it replaces each digit to the right of the decimal point by 0. The
number is changed inside the calculator as well as in the display. The original
number can be recalled to the display by pressing
gF
.