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# ds1 - ECE 178 Digital Image Processing Discussion Session#1...

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ECE 178 Digital Image Processing Discussion Session #1 Mehmet Emre Sargin [email protected] January 12, 2007 Exercise: 1 Suppose A = 1 2 3 4 5 6 (1) In order to initialize A as stated above type >> A = [ 1 2 3;4 5 6 ] A = 1 2 3 4 5 6 The semicolon is used for suppressing the output. If you do not want to suppress the output, just ignore the semicolon at the end (Be careful when dealing with large arrays i.e. images). Warning! Remember, in Matlab you can not start a variable or a function or even a script name with a number. 1.m invalid question1.m valid 1

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DS#1 ECE 594N Mehmet Emre Sargin [email protected] Exercise: 2 First indices are for accessing rows and the second indices are for accessing columns. In order to access whole row or column, colon is used. >> A(2,3) ans = 6 >> A(:,1) ans = 1 4 >> A(1,:) ans = 1 2 3 You can access the elements of an array also by specifying a single index A ( i, j ) A ( i + r ( j - 1)). Where r is the number of rows in A .
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