1. ENGINEERING 2304 Computer Programming for Engineers ENGR 2304-51191 Spring 2015 Week 2

2. Class Outline Quiz Review Homework Excel References: Absolute vs. Relative Sum Command Log, Natural Log, and Trigonometric References Excel Practice Exercises

3. Week 2 Quiz Pull out a sheet of paper and solve the following problems: 1.Define a kip. 2.The formula for continuous compound interest is A=Pe^rt, where r is interest rate as a decimal. Find the value of $1200 invested at 4% interest over a period of 8 years. 3.In the triangle to the right, find the measure of side lengths H and X, and angle a.

4. Quote of the Day: “Compound Interest is the most powerful force in the universe.” –Albert Einstein

5. Homework 1 Overview

6. Relative vs. Absolute Cells Relative Cell References: Most commonly used cell reference. Tells Excel to look for referenced cell a certain number of cells up/down and left/right from origin cell. When cell is copied or pasted, formula retains relative position. Good for multi-cell calculations. Absolute Cell References: Tells Excel to look at a specific row and column. Does not change when formula is moved. Excellent for referring back to worksheet inputs.

7. Sum Command Sums cells in a given range Can use relative or absolute cell references

8. Log, Natural Log, and Trigonometric Functions Excel has many built-in functions. A few of the most useful are the trigonometric and power functions. Important Trigonometric Functions: sin(), cos(), tan() csc(), sec(), cot() sinh(), cosh(), tanh() asin(), acos(), atan() acsc(), asec(), acot() pi() 3 rd Century BC Coin of Pythagoras

9. Next US Coin?

10. Log, Natural Log, and Trigonometric Functions Important Exponential Functions: ln() log() exp() Grégoire de Saint-Vincent

11. Excel Lab Example 1 Goal: Create a table for the trigonometric ratios for every 15 degrees from 0 to 360.

12. Excel Lab Example 2 Goal: Create a monthly profit and loss table for a company over a single year. Calculate profit/loss for each month. Calculate percent profit/loss for each month. Calculate percent and total profit/loss for the entire year.

13. Excel Lab Example 3 Goal: Create a calculator for a 30 year mortgage. Inputs will be sticker interest rate and principle amount. Calculate monthly payment and a full 360 payment amortization table. i=sticker interest rate, r=effective rate e=Euler’s constant=2.71828 n=number of payments M=Monthly Payment P=Loan Principle M = P * ( r / (1 - (1 + r) -n ))