Functions Section III. The TexSolver-10 numeric function set includes a wide range of operations to help you get accurate answers with a minimum number of keystrokes. Most of the available functions are continuously displayed on the left side of the screen next to a letter. These functions are executed by pressing the CTRL or SHIFT keys in conjunction with the respective letter key. For example, to execute \f2X\f3\d010\f22\f1 (X Squared), press CTRL-Q. To execute ûX (Square Root of X), press SHIFT-Q. Logarithmic and Exponential LN (SHIFT-Y). Replaces X by the natural logarithm of X. e^X (CTRL-Y). Replaces X by the number e to the power X. LOG (SHIFT-U). Replaces X by the base 10 logarithm of X. 10^X (CTRL-U). Replaces X by 10 to the power X. Trigonometric DEG (SHIFT-K). Sets degrees as the unit of angular measurement for trigonometric functions. When in effect, the DEG function is highlighted in the display. RAD (CTRL-K). Sets radians as the unit of angular measurement for trigonometric functions. When in effect, the RAD function is highlighted in the display. GRAD (SHIFT-L). Sets grads as the unit of angular measurement for trigonometric functions. When in effect, the GRAD function is highlighted in the display. (360 degrees = 2ã radians = 400 grads). SIN (SHIFT-G). Replaces X by the sine of X. ASIN (CTRL-G). Replaces X by the arcsine (inverse sine) of X. COS (SHIFT-H). Replaces X by the cosine of X. ACOS (CTRL-H). Replaces X by the arccosine (inverse cosine) of X. TAN (SHIFT-J). Replaces X by the tangent of X. ATAN (CTRL-J). Replaces X by the arctangent (inverse tangent) of X. Conversions PR (SHIFT-X). Converts polar magnitude r and angle é in the X and Y registers, respectively, to rectangular x and y coordinates placed in the X and Y registers, respectively. RP (CTRL-X). Converts rectangular x and y coordinates placed in the X and Y registers, respectively, to polar magnitude r and angle é placed in the X and Y registers, respectively. DR (SHIFT-Z) Replaces the degree value in X by the equivalent radian value. RD (CTRL-Z). Replaces the radian value in X by the equivalent degree value. HMS (SHIFT-C). Converts decimal hours (or degrees) to hours, minutes, seconds format. For example, 5.408600 hours will be converted to 5.243096, or 5 hours, 24 minutes, 30 seconds, and 96 hundredths of a second. HR (CTRL-C). Converts hours, minutes, seconds (or degrees , minutes, seconds) format to decimal hours (or degrees). For example, 1.234567 (1 hour, 23 minutes, 45 seconds, 67 hundredths of a second) will be converted to 1.396019 decimal hours. Math ûX (SHIFT-Q). Replaces X by the square root of X. X^2 (CTRL-Q). Replaces X by X squared. 1/X (SHIFT-W). Replaces X by the reciprocal of X. Y^X (CTRL-W). Replaces X by Y to the power X. % (SHIFT-E). Replaces X by X percent of Y, that is, (Y * (X/100)). %CH (CTRL-E). Replaces X by the percent of change between X and Y, that is, ((X - Y) * 100) / Y. ã (SHIFT-R). Replaces X by the number ã. X! (CTRL-R). Replaces X by X factorial. INT (SHIFT-T). Replaces X by the integer portion of X. FRAC (CTRL-T). Replaces X by the fractional portion of X. Other Functions PRINT (CTRL-A). When PRINT is executed, the value of X and the last operation are printed as each operation is performed. When PRINT mode is selected, the PRINT command on the screen is highlighted. To turn off PRINT mode, execute PRINT again. Make sure the printer is ready before executing PRINT. EXIT (CTRL-S). Saves the Stack, Storage, LAST X, display mode, and angular mode settings on the default drive disk file SETUPS.TS, terminates program execution, and returns to DOS command level. FIX (SHIFT-A). Displays numbers in fixed decimal notation. Fixed decimal display is selected or modified by executing FIX (SHIFT-A) followed by a number from 0 to 9 to specify the number of decimal places to which you want the display rounded. Numbers are ordinarily displayed without exponents unless they are too large or too small to be displayed with the current FIX mode, in which case they are displayed in scientific notation. Commas are automatically inserted for numbers of 1,000 and greater. In FIX mode, the FIX function is highlighted on the screen. SCI (SHIFT-S). Displays numbers in scientific notation. To select SCI mode, execute SCI (SHIFT-S) followed by a number from 0 to 9 which specifies the number of decimal places to which the display is rounded. In SCI mode, the SCI function is highlighted on the screen. ENG (SHIFT-D). Displays numbers in engineering notation, which is similar to scientific notation except all exponents are multiples of three. To select ENG display mode, execute ENG (SHIFT-D) followed by a number from 0 to 9 which specifies the number of additional digits to be displayed after the first one. In ENG mode, the ENG function is highlighted on the screen. Note: No matter which display mode is in effect, numbers stored internally are not altered. Errors If you attempt to perform an improper operation, such as division by zero, the LAST OP register will display ERROR. The following operations generate ERROR messages. / where X = 0. ST/ where X = 0. LN where X <= 0. LOG where X <= 0. Y^X where Y = 0 and X <= 0, or Y < 0 and X noninteger. ASIN where |X| > 1. ACOS where |X| > 1. ûX where X < 0. 1/X where X = 0. X! where X < 0. MEAN where n = 0. SDEV where n <= 1. YLECC where n <= 1. XLECC where n <= 1. LR where n <= 1. ERROR is also displayed if division by zero or the square root of a negative number would be required during calculation of the statistical formulas.