1. IENG 423 Design of Decision Support Systems Modeling with Excel Excel Basics Cell references, Formulas, Functions and Formatting

2. MS Excel Formulas In most spreadsheet applications you will want to do calculations in cells …usually in a lot of cells You will use formulas to express these calculations

3. MS Excel Formulas In a cell, enter an = followed by the arithmetic expression (formula) that you want calculated The formula can contain  Cell references - F5  Arithmetic operators +-*/^  Constants 3.14  Functions

4. MS Excel Formulas – Arithmetic Operators OperationOperator Addition+ Subtraction- Multiplication* Division/ Exponentiation^ Precedence( )

5. MS Excel Formulas – Arithmetic Precedence “Please Excuse My Dear Aunt Sarah”  Parentheses control the order of operations, then-  Multiplication/Division  Addition/Subtraction  Within a precedence level go from left to right

6. MS Excel Formulas =B4+C4 =F35 * 3.14 =3*2+4 =3*(2+4) Same?

7. MS Excel By the way You can toggle between calculation view and formula view (to see your formula) with… Ctl + ~

8. MS Excel Cell References Recall that cell references consist of row letter + the column number of the cell of interest A1, Z23 YYY99 If you use a cell reference in a formula and move that formula… …Excel will try to update the cell reference in that formula That’s called a Relative Reference

9. MS Excel Cell References Sometime you will not want the cell reference updated Absolute Reference Use $ in cell reference $A$4 - neither row part or column part of reference can be changed $A4 – row reference can change, but column reference can not A$4 – column reference can change but row reference can not

10. MS Excel Cell References Absolute References  F4 key on keyboard will cycle a reference through absolute, column absolute, row absolute and relative reference for a specific cell

11. MS Excel Cell References Named Ranges  You can give selected ranges of cells names…  Then refer to them by name  You can to this with a single cell

12. MS Excel Cell References Named Ranges  1 – select a range, click in the name box, then enter the name that you want to use for this  2 – select a range, click on Insert from menu bar, click on name, then define… you will then see a name dialogue box, Excel will try to anticipate what you are doing, correct as needed

13. MS Excel Cell References Named Ranges  You can use names – To jump to specific parts of a workbook Or in formula in place of cell references

14. MS Excel Functions Functions are predefined sets of operations The key to using functions effectively in understanding the arguments

15. MS Excel Functions Several ways to insert a function  Insert (on menu bar)  Right click on cell and select Insert – Function  Select cell to hold function and click on function symbol next to function bar

16. MS Excel Some common functions =SUM() =AVERAGE() =COUNT() =MAX() =MIN()

17. MS Excel There are a lot more Math & Trig Statistical Time/Date Text Financial Logical Lookup

18. MS Excel Functions Functions can be used alone Functions can be combined with other expression in a formula  If it is the right type Functions can be nested

19. MS Excel Formats Cell formats  General  Number  Date/time  Percentage  Special  Custom