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Conditional Statements

Conditional Statements. ENGR 1181 MATLAB 7. Conditional Statements in Real Life.

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Conditional Statements

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  1. Conditional Statements ENGR 1181 MATLAB 7

  2. Conditional Statementsin Real Life A Fluorescence Activated Cell Sorter (FACS) sorts cells based on predetermined conditions. Based on which conditions are met, one of 3 events occur: (1) a positive charge is applied to the cell, (2) a negative charge is applied, or (3) there is no charge applied. Based on charge, the cells will be sorted according to these conditions.

  3. Today's Learning Objectives • After today’s class, students will be able to: • Explain how conditional statements (e.g., if-end, if-else-end, switch-case) are used to make decisions.

  4. Review from Prep Reading: • Conditional statements allow MATLAB to make decisions based on whether a certain condition is met. • If it is met: a specified set of actions is taken. • If it is not met: a different set of actions is taken.

  5. Example Suppose you buy a lottery ticket. Your subsequent actions will likely be different depending whether or not you win…

  6. Example If I win the lottery I will… If I do not win I will… Keep attending work Continue making awesome PowerPoints about MATLAB • Quit my job! • Buy a lake house! • Throw a huge party!

  7. If-End Statements in MATLAB • Each 'if' must have a corresponding 'end' • The conditional expressions can contain relational/logical operators if conditional expression …program code end

  8. If-Else-End Structures if x<1 …code 1 else …code 2 end • If the condition evaluates to true, code 1 is executed and code 2 is skipped • Otherwise… if the condition is not met, code 2 is executed and code 1 is skipped

  9. Lottery Example Lottery = input('Did you win the lottery? 1=yes, 0=no') if lottery == 1 quit job buy lake house throw huge party elsekeep job keep making PPTs end

  10. If - Elseif - Else - End if conditional …code 1 elseifconditional …code 2 else conditional …code 3 end

  11. If –Elseif – Else – End Example Calculate a tip based on a restaurant bill: • Bill less than $10:Tip is $1.80 • Bill between $10 and $60Tip is 18% • Bill above $60Tip is 20% If bill < $ 10 False ElseIf $ 10 < bill < $ 60 True False Else tip = $ 1.80 True tip = bill * 0.18 tip = bill * 0.20 End

  12. If – Elseif – Else – End Example bill =input('Enter the amount of the bill in dollars:') if (bill<=10) tip = 1.8; elseif (bill>10) & (bill<=60) tip= bill*0.18; else tip= bill*0.2; end

  13. Important Takeaways • Every if MUST have an end • Programs can have as many if statements as you want • Programs can perform the same task using different combinations of if-end, if-else-end, and if-elseif-else-end statements • Else is optional and it doesn't require a conditional statement.

  14. Preview of Next Class • For Loops 1 • How do we repeat code 10 times? 1000 times? 1010 times? • Examples of basic for-end loops • For-end loops with vectors • Array accessing in for-end loops with vectors

  15. What’s Next? • Review today’s Quiz #07 • Open the in-class activity from the EEIC website and we will go through it together. • Then, start working on MAT-07 homework. • Prepare for next class by reading about Advanced For Loops

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