Engineering. Engr.10 JKA & KY. College of. San Jose State University

Transcription

1 JKA & KY 1

2 Analysis analysis is a systematic process for analyzing problems that arise in the various fields of engineering. As part of the problem solving process, the data collected has to be processed, analyzed and sometimes displayed graphically by using many mathematical tools that are available. In many cases, once you have defined and set up the problem properly, numerical methods are required to solve the mathematical equations. Microsoft s Excel spreadsheet software has many numerical procedures built directly into its program structure. 2

3 Spreadsheets Capabilities Data Analysis Tools Store, process, and sorts data Graphically display data ( application) Perform statistical analysis Fit equations to curves ( application) Solve single and system of algebraic equations (Engr. Appl.) Solve optimization problems ( application) Draw Flow Charts 3

4 Standard Tensile Test Standard Specimen Material Strength Ductile Steel (low carbon) Sy yield strength S u fracture strength σ (stress) = Load / Area ε (strain) = (change in length) / (original length) Ken Youssefi PDM I, SJSU 4

5 menu bar currently active cell (A1) formula bar File management options worksheet tabs 5

6 Entering Data into Cells (Cell Content) 6

7 Copying Cells 1. Using icons in the ribbon menu a) Click on the Cells to be copied b) Select Copy on the Home toolbar c) Click on the Cells to paste the copied contents d) Select Paste or Special Paste on the Home toolbar 2. Using keyboard - Ctrl C to copy & Ctrl V to paste 3. Pull Down corner at Lower Right Corner (recommended for a range of cells) a) place the cursor on the LRC of the active cell b) Click and drag over the cell rage Fill Down : select the cell containing the active formula and the range of cells you need to fill select Fill on the Home menu and choose Down 7

8 Relative Addressing A B C D E 1 2 internal equation =B3+C =B4+C =B5+C =B6+C6 7 SUM: =SUM(D3:D6) 8 A B C D E 1 2 Result SUM: =B3+C3 adds the content of cells B3 and C3. 2. As the formula is copied into D4, D5 and D6, cell addresses of the formula are incremented. 8

9 Absolute Addressing A B C D E 1 k= internal equation =B3+C3+$B$ =B4+C4+$B$ =B5+C5+$B$ =B6+C6+$B$1 7 SUM: =SUM(D3:D6) 8 A B C D E 1 k= Result SUM: Using the absolute cell address, $B$1, will keep the cell reference constant for all calculations. 9

10 Basic Math Operations Operation Algebraic Excel Format add a+b a+b subtract a-b a-b multiply ab, axb, a.b a*b divide a/b a/b exponential a n a^n number format 5.07x E *10^ x E *10^(-3) 10

11 Excel Formulas In Excel, a formula expresses dependency of one cell on others in the worksheet. Formula entry for a Cell begins with clicking on the Cell first and then either typing the equal sign = in the Cell itself or clicking on the Formula Bar, and ends with Enter. A Formula can be edited by first clicking on the Cell and then editing the formula on the active Cell or on the Formula Bar. A Formula may contain functions. Example Math syntax: 3x 2 + e (-0.3x) - 10x Excel syntax: =3*(A15^2) + EXP(-0.3*A15) - 10*A15 The value of x is in cell A15 11

12 Using Excel Built-in Functions After clicking on the Cell Click on the Formula Bar (f x ), follow instructions on the Insert Function window. Or, in the Formulas menu select Insert Function Follow instructions on the Function Argument window, e.g., select the value, or range of values for the function. 12

13 Frequently Used Excel Functions Math Excel Syntax Purpose: Returns the: (Assume value of x is in cell A15.) π PI() value of π ( ) e x EXP(A15) Value of e x where e is the base of Natural Log x SQRT(A15) Value of the square root of x log 10 (x) LOG10(A15) Logarithm of x, with base 10 ln(x) LN(A15) Natural logarithm of x, with base e SUM(x1,x2,x3) SUM( A15:A17) x1+x2+x3 cos(x) COS(A15) Cosine of x sin(x) SIN(A15) Sine of x tan(x) TAN(A15) Tangent of x Average(x1,x2,x3) AVERAGE(A15:A17) (x1+x2+x3)/3 13

14 Example: My Expense Table 14

15 My Expense Table - Aug. Expense =SUM(B5:B10) 15

16 My Expense Table - Aug. Expense (cont.) 16

17 Eliminating Repetition Repeat procedure for the Total of each category Place cursor in the lower right corner of cell B11, click-and-drug along row 11 for the rest of the total of the rest of the months 17

18 My Expense Table - Completed 18

19 Insert menu 2013 version Plotting Data 2007 version 19

20 2013 version Data menu 2007 version 20

21 2013 version View menu 2007 version 21

22 MAX and MIN Functions =MAX or MIN(X1, X2, X3 ) will take the maximum or minimum of the numbers in the parentheses. =MAX or MIN(X1:X4) will take the maximum or minimum of all the numbers from X1 to X4. COUNT Function =COUNT(X1, X2, X3 ) will count the number of cells that contain numbers and the arguments in the list that are numbers. Example =COUNT(A1, A2, A3) will return 2, because of the 4 and 9. =COUNT(A1:A4) will return 3, because of the 4, 9 and 3. =COUNT(A1:A4, -17, world ) will return 4, because of the 4, 9, 3 and

23 COUNTIF Function =COUNTIF(range, criteria) will count the number of cells in the range that match the criteria. Note: if the criteria consists of a relational expression, such as >5, it must be enclosed in double quotes. Example =COUNTIF(A1:A4, >5 ) will return 2, because 6 and 9 are greater than 5. =COUNTIF(A1:B4, =6 ) will return 3, because three cells in the range contain 6. 23

24 IF Logical Function =IF(logical_test, value_if_true, value_if_false) returns the second argument if the test is true, and the third if it is false. Example =IF(A1>3, A1 is larger than 3, 0) would return A1 is larger than 3. =IF(A4>3, A1 is larger than 3, 0) would return 0. 24

25 VLOOKUP or HLOOKUP Function Vertical search Horizontal search =VLOOKUP(lookup_value, table_array, col_index_number, not_exact_match) finds the value in the top row of a table and returns the corresponding column value. Lookup_value: The value that the function looks for in the first column. Table_array: The table that the function looks through. Col_index_number: The column number from which the function should return (search for) the value. Not_exact_match: Can be either True or False. True means it will find the closest value to the lookup value. False means you only want the value returned if it is an exact match. 25

26 Question: find the price for item with ID# 12 VLOOKUP Function - Example Q R S =VLOOKUP(lookup_value, table_array, col_index_number, not_exact_match) =VLOOKUP(12, Q50:S53,2, FALSE) Answer =

27 Row 1 is not in ascending order HLOOKUP Function - Example =HLOOKUP (12, A1:E3, 2, False) means that you are looking in the second row for the value corresponding to the value 12 in top row, and you are looking for an exact match to 12. This would return $ =HLOOKUP (10, A1:E3, 2, False) means that you are looking in the second row for the value corresponding to the value 10, and you are looking for an exact match to 10. Since there is no 10 in top row, it would return #N/A. =HLOOKUP (50, A1:E3, 3, True) means that you are looking in the third row for the value corresponding to the value 50 in top row. Since there is no 50 in the top row, it returns the match corresponding to the largest value in the top row that is less than the lookup value of 50. In this case, it returns 8. If range lookup is TRUE, the values in the first row of table array must be placed in ascending order:...-2, -1, 0, 1, 2,..., A-Z, FALSE, TRUE; otherwise, HLOOKUP may not give the correct value. If range lookup is FALSE, table array does not need to be sorted. 27