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Text version of the page
| More About Matrices and Arrays | ||||||||||||||||||||||||||||||||||||||||||||||||
| Scalar Expansion Matrices and scalars can be combined in several different ways. For example, ascalarissubtracted from a matrix by subtracting it from each element. The average value of the elements in our magic square is 8.5, so B= A- 8.5 forms a matrix whose column sums are zero: B= | ||||||||||||||||||||||||||||||||||||||||||||||||
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| sum(B) ans = 0000 With scalar expansion, MATLAB assigns a specified scalar to all indices in a range. For example, B(1:2,2:3) = 0 zeroes out a portion of B: B= | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Logical Subscripting The logical vectors created from logical and relational operations can be used to reference subarrays. Suppose X is an ordinary matrix and L is a matrix of the samesizethat is the result of some logical operation. Then X(L) specifies the elements of X where the elements of L are nonzero. | ||||||||||||||||||||||||||||||||||||||||||||||||
| 2-27 | ||||||||||||||||||||||||||||||||||||||||||||||||