HP 113394 User Guide - Page 100

Section 7 Mathematics and Number-Alteration Functions The hp 12c platinum 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. Pressing g¡ calculates the square of 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 in RPN mode and z10g°} in ALG mode. 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 87) to show the desired number of decimal places, then press fB. 100 File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 100 of 275 Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm