A matrix represents another way of writing information. Here, the information is written as a rectangular array. For example, the scores of two students in exams are as follows:
Eric: 30% in Maths, 40% in English and 88% in History.
Stephen: 23% in Maths, 45% in English and 90% in History.
This can be written as
(■(30&40&88@23&45&90))
Lesson Content
The order of a matrix is the size of the matrix and it gives the number of rows followed by the number of columns in the matrix.
Column 1 column 2
Row 1 a b
Row 2 c d
The order of this matrix is 2 x 2. We say it is ‘of the order 2 by 2.’
Below are matrices of different orders:
(■(a&b&c@d&e&f@g&h&i)) (■(a&b&c@d&e&f)) (■(a@b@c))
Order 3 x 3 order 2 x 3 order 3 x 1
(a b) (a b c)
Order 1 x 2 order 1 x 3
A matrix is often identified by a bold capital letter. For example, A = (■(4&1@2&3)).
In a matrix, each number is known as an element. So 4, 1, 2 and 3 are all elements of A.
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