Chapter 4: Programming with MATLAB - FET

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4-27 Use of a Mask One can often avoid the use of loops and branching and thus create simpler and faster programs by using a logical array as a mask that selects elements of another array. Any elements not selected will remain unchanged. The following session creates the logical matrix C from the numeric matrix A . >>A = [0, -1, 4; 9, -14, 25; -34, 49, 64]; >>C = (A >= 0); The result is C = Z.R.K 1 0 1 1 0 1 0 1 1 One can use this mask technique to compute the square root of only those elements of A given in the previous program that are not less than 0 and add 50 to those elements that are negative. The program is: A = [0, -1, 4; 9, -14, 25; -34, 49, 64]; C = (A >= 0); A(C) = sqrt(A(C)) A(~C) = A(~C) + 50
while Loops The while loop is used when the looping process terminates because a specified condition is satisfied, and thus the number of passes is not known in advance. A simple example of a while loop is x = 5; while x < 25 disp(x) x = 2*x - 1; end The results displayed by the disp statement are 5, 9, and 17. 4-28 Z.R.K
Page 1 and 2: UNIVERSITY OF JORDAN Faculty of Eng
Page 3 and 4: 4-3 Components of an Algorithm •
Page 5 and 6: 4-5 Steps for developing a computer
Page 7 and 8: Effective documentation can be acco
Page 9 and 10: Flowcharts are useful for developin
Page 11 and 12: To locate a runtime errors, try the
Page 13 and 14: Order of precedence for operator ty
Page 15 and 16: Logical function ischar(A) isempty(
Page 17 and 18: The if and else Statement The if st
Page 19 and 20: Instead, consider what happens if w
Page 21 and 22: For example, suppose that y = ln(x)
Page 23 and 24: 4-22 Strings and the input Statemen
Page 25 and 26: for Loops A simple example of a for
Page 27: The continue Statement The followin
Page 31 and 32: 4-30 A simple example of a while lo
Page 33 and 34: The switch Structure The switch str
Page 35 and 36: The Editor/Debugger containing two
Page 37: End of Chapter 4 Problems Page 241

Chapter 4: Programming with MATLAB - FET

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