User manual CITIZEN CT561

[. . . ] Result line It displays a result of up to 10 digits, as well as a decimal, a negative sign, a " x10 " indicator, and a 2-digits positive or negative exponent. results that exceed the digit limit are displayed in scientific notation. Indicators The following indicators appear on the display to indicate you the current status of the calculator. Indicator Meaning M Independent memory ­ Result is negative, or the entry line is full 2nd 2nd set of function keys is active. [. . . ] To insert a character, move the cursor to the position of the character where you want to insert, it will be inserted in the front of the character after pressing [ 2nd ] [ INS ] and entering a new character. (Note) : The blinking cursor " " means the calculator is in insert mode On the contrary, the blinking cursor is displayed as "_" and it means the calculator is in overwrite mode. After execution is complete, pressing [ ] or [ ] key will display the operation from the beginning or the end. After execution is complete or during entering, you can press either [ ] [ ] to display previous input steps and edit values or commands for subsequent execution. (Note) :The replay function isn't cleared even when [ CL ] is pressed or power is turned off, so contents can be recalled even after [ CL ] is pressed. However, replay function is cleared when mode or operation is switched. When a mathematically illegal calculation is performed, error position display function will tell you with the cursor where the error is. You can also clear an error by pressing [ CL ] and then re-entered the values and expression from the beginning. The calculator has eight memory variables for repeated use : A, B, C, X, Y, X1, X2, PROG. You can store a real number in variables A, B, C, X, Y, X1, X2 and an expression in PROG. Each calculation is performed in the following order of precedence : 1) 2) Expression inside parentheses. The correct result cannot be derived by entering [ ( ] 2 [ + ] 3 [ ) ] [ EXP ] 2. Be sure to enter [ x ] 1 between the [ ) ] and [ EXP ] in the below example. You can use this key sequence to calculate percentages, add-ons, discounts, and percentages ratios. The calculator enables you to repeat the last operation executed by pressing [ = ] key for further calculation. Even if calculations are concluded with the [ = ] key, the result obtained can E - 10 Be used for further calculation. Once a numeric value or numeric expression is entered and [ ENTER ] is pressed, the result is stored by this function. (Note) : Even if execution of a calculation results in an error, however, Answer memory retains its current value. The calculator can calculate common and natural logarithms and antilogarithms using [ LOG], [ LN ], [ 2nd ] [ 10 x ], and [ 2nd ] [ e x ]. To enter a mixed number, enter the integer part, press [ A b/c ], enter the numerator, press [ A b/c ], and enter the denominator ; To enter an improper fraction, enter the numerator, press [ A b/c ], and enter the denominator. During a fraction calculation, if the figure is reducible, a figure is reduced to the lowest terms after pressing a function command key ( [ + ], [ ­ ], [ x ] or [ ÷ Calculations containing both fractions and decimals are calculated in decimal format. The relation among the three angle units is : 180 ° =£krad = 200 grad Angle conversations ( See Example 28. [. . . ] To use a value in a calculation, press [ ENTER ] when the values is displayed. To predict a value for x ( or y ) given a value for y ( or x ), select the x ' ( or y ' ) variable, press [ ENTER ], enter the given value, and press [ ENTER ] again. Sum of (x x y) for all x-y pairs Linear regression y-intercept Linear regression slope Correlation coefficient Predicted x values given a, b, and a y values Predicted y value given a, b, and x value. (Note) : If an error message appears in the display under STATVAR menu, just pressing [ ] or [ ] can continue viewing next statistical variable value. [. . . ]