Lecture 2-18-08 - Matthew Bessette ENGR 141-107 Looping...

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Matthew Bessette ENGR 141-107 February 18, 2008 Looping Structures: “for” Loops - Why do we need looping? o Repetition of a code segment o Recall the algorithm for calculating a factorial o Soil homework – “repeat unless organic” - Definite Loops – For Loops o A segment of code executes a certain number of times o Ex: counting, data processing, sampling - Indefinite Loops – While loops o Also referred to as conditional loops o A segment of code repeated executes until a certain condition is satisfied o Any for-loop can also be written as a while loops o Ex: validating input, calculations - Definite Loops: For loops o Execute a certain number of times o Sampling rate o Counting backwards o Palm p.211 for counter=start:step:finish %executable statements (may use counter) % it is bad practice to change loops index numbers % counter = 2 (causes code to never finish infinite loop) % counter=counter-3 End - Where to Use? o Inside Programs o Inside Functions - Definite Loops o We can display the numbers 1 10 as follows: for M = 1:1:10 disp(M) end o What if we want to display 10 1 for w=10:-1:1
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