Chapter 4: Programming in Matlab - College of the Redwoods

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$Math 50A February 18, 2011 Quiz #10 Name: David Arnold ...$

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262 Chapter 4 Programming in Matlab Note that vector y is of class double, using 8 bytes to store each entry. Alternatively, we can check the class with Matlab’s class command. On the one hand, the command >> class(x) ans = logical informs us that vector x has class logical. On the other hand, the command >> class(y) ans = double informs us that the vector y has class double. Like some of the other conversion operators we’ve seen (like uint8), Matlab provides an operator that will convert numeric arrays to logical arrays. Any nonzero real number is converted to a logical 1 (true) and zeros are converted to logical 0 (false). To see this in action, first enter the following matrix A. >> A=[0 1 3;4 0 0; 5 7 -11] A = 0 1 3 4 0 0 5 7 -11 Note that A has class double. >> class(A) ans = double Now, convert A to a logical array.
Section 4.1 Logical Arrays 263 >> A=logical(A) Warning: Values other than 0 or 1 converted to logical 1. A = 0 1 1 1 0 0 1 1 1 Note that all nonzero entries in the original matrix A are now logical 1, while all zeros in the original matrix A are now logical zero. You can test the new class of matrix A with the following command. >> class(A) ans = logical Relational Operators Matlab provides a complete list of relational operators (see Table 4.1). Operator Description < Less than ≤ Less than or equal to > Greater than ≥ Greater than or equal to == Equal to ∼= Not equal to Table 4.1. Matlab’s relational operators. The Matlab relational operators compare corresponding elements of arrays with equal dimensions. Relational operators always operate element-by-element. That is, they are “array smart.” For example, consider the vectors v and w.
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Section 4.2 Control Structures in M
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Section 4.3 Functions in Matlab 333
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Section 4.4 Variable Scope in Matla
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Section 4.5 Subfunctions in Matlab
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Section 4.6 Nested Functions in Mat
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Chapter 4: Programming in Matlab - College of the Redwoods

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