Sharp EL-W516B EL-W506 , EL-516 , EL-W546 Operation Manual - Page 6

5. Enter your answer. If you make a mistake, press j or N to clear any entered numbers, and enter your answer again. 6. Press e. • If the answer is correct, " " appears and the next question is displayed. • If the answer is wrong, " " appears and the same question is displayed. This will be counted as an incorrect answer. • If you press e without entering an answer, the correct answer is displayed and then the next question is displayed. This will be counted as an incorrect answer. 7. Continue answering the series of questions by entering the answer and pressing e. 8. After you finish, press e and the number and percentage of correct answers are displayed. 9. Press e to return to the initial screen for your current drill. Math Drill sample Current question/ Total questions Question ộ ộ × Table sample ộ See step 6 above. Number of questions Operator type Percentage correct Correct answers Total remaining questions Question See step 6 above. ộ Multiplicand Order type Percentage correct Correct answers Ranges of Math Drill Questions The range of questions for each operator type is as follows. + Addition operator: "0 + 0" to "20 + 20" ] Subtraction operator: "0 − 0" to "20 − 20"; answers are positive integers and 0. > Multiplication operator: "1 × 0" or "0 × 1" to "12 × 12" ) Division operator: "0 ÷ 1" to "144 ÷ 12"; answers are positive integers from 1 to 12 and 0, dividends of up to 144, and divisors of up to 12. +]>) Mixed operators: Questions within all the above ranges are displayed. COMPLEX NUMBER CALCULATIONS 25 To carry out addition, subtraction, multiplication, and division using complex numbers, press b 3 to select CPLX mode. Results of complex number calculations are expressed using two systems: ᶃ @ E: Rectangular coordinate system (The symbol appears.) ᶄ @ u: Polar coordinate system (The symbol appears.) Complex Number Entry ᶃ Rectangular coordinates x-coordinate + y-coordinate O or x-coordinate + O y-coordinate ᶄ Polar coordinates r Q θ r : absolute value θ: argument • On selecting another mode, the imaginary part of any complex number stored in the independent memory (M) and the last answer memory (ANS) will be cleared. • A complex number expressed in rectangular coordinates with the y-value equal to zero, or expressed in polar coordinates with the angle equal to zero, is treated as a real number. • Press N 1 to return the complex conjugate of the specified complex number. MATRIX CALCULATIONS 26 You can store and calculate up to four matrices containing up to four rows and four columns each in MATRIX mode. Press b 4 to enter MATRIX mode. Note: You can use the MATH menu in MATRIX mode to edit, recall, and store matrices, as well as to call matrixspecific functions. Entering and Storing Matrices Before performing matrix calculations, a matrix must be created. Follow the steps below to enter and store matrices. 1. Press b 4 to enter MATRIX mode. 2. Press N 2 to bring up the matrix entry screen. • Any matrix data remaining in the buffer, along with any previously entered, loaded, or calculated matrix data, will be displayed. 3. Define the matrix dimensions (up to four rows by four columns) by entering the required dimensions using the number keys and pressing e. Matrix dimensions (row × column) Element fields Entry field Matrix entry screen (example) 4. Enter each element in the matrix by entering a value in the entry field and pressing e. • Each matrix element can display up to seven digits (the decimal point counts as one digit). If an element exceeds seven digits in length, it may be displayed in exponent notation within the matrix. • A maximum of three rows by three columns can be displayed at one time. Use u, d, l, and r to move the cursor through the matrix. 5. When you have entered a value for each element, press j to exit the matrix entry screen. 6. Press N 4 and select a memory (matA-matD) to store the newly-created matrix in. Modifying a stored matrix 1. To load a stored matrix into the matrix entry screen, press N 3, then select the memory (matA-matD) that holds the matrix you wish to modify. • Loading new data into the screen will automatically replace any data that may already exist there. 2. Using the matrix entry screen, you can modify the values of elements in the matrix. Assign new values wherever necessary and press e after each one. • If you wish to modify the number of rows or columns, first press j N 2. You can then enter new values for the matrix dimensions. 3. When you have finished making changes, press j to exit the matrix entry screen. 4. Press N 4 and select a memory (matA-matD) to store the newly-created matrix in. Using Matrices in Calculations Matrices stored in memories (matA-matD) can be used in arithmetic calculations (with the exception of division between matrices) and calculations that use x3, x2, and x−1. You can also use the following matrix-specific functions that are available in the MATH menu. dim (matrix name, row, column) Returns a matrix with dimensions changed as specified. fill (value, row, column) Fills each element with a specified value. cumul matrix name Returns the cumulative matrix. aug (matrix name, matrix name) Appends the second matrix to the first matrix as new columns. The first and second matrices must have the same number of rows. identity value Returns the identity matrix with specified value of rows and columns. rnd_mat (row, column) Returns a random matrix with specified values of rows and columns. det matrix name Returns the determinant of a square matrix.