math245lab04

# math245lab04 - Math245 Computer Lab set#4 Fall 2008 1 The...

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Math245 Computer Lab set #4, Fall 2008 1 The for loop The for loop is a Matlab construct that repeats block of statements for specified number of times. The for loop has the form: for index = expression; statement 1; ... statement n; end This for loop executes Matlab statements 1 to n for all values of the loop variable index specified by the expression . For example, for i=1:10; statement 1; ... statement n; end This for loop repeats statement 1 to n from i=1 to i=10 . At the first time, Matlab assigns i=1 , then the statement block is executed. When Matlab hits end line Matlab goes back to for line assigning i=2 , and statement block is executed. Matlab repeats this process up to i=10 . In this example, if the expression for index variable is i=0:2:10; , the statement block is repeated from i=0 to i=10 , step 2( i=0,2,4,...,10 ). Here is an example to calculate 100!. fact=1; for i=1:100; fact = fact*i; end Here is an example to calculate a geometric sum 50 X i =0 ar i = a + ar + ar 2 + ar 3 + · · · with a = 2 and r = 0 . 5.

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