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Conditional Statements

This lesson focuses on conditional statements in MATLAB, particularly their application in real-life scenarios such as the Fluorescence Activated Cell Sorter (FACS), which sorts cells based on predetermined conditions. Students will learn to explain how conditional statements like if-end, if-else-end, and switch-case are utilized to make decisions in programming. By analyzing examples, including a lottery scenario and dining tips based on bill amounts, participants will grasp the importance of conditional logic in MATLAB. Essential concepts, important takeaways, and previews of future topics will also be discussed.

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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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