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2 Matrices and Arra ys
Matrices a nd Magic Squares
In this section.. .
“About Matrices” on page 2-2
“Entering Matrices” on page 2-4
“sum, transpose, and diag” on page 2-5
“Subscripts” on page 2-7
“The Colon Operator” on page 2-8
“The magic Function” on page 2-9
About Matrices
In MATLAB, a matrix is a rectangular array of numbers. Special meaning
is sometimes attached to 1-by-1 matrices, which are scalars, and to m atrices
with only one row or column, which are vectors. M ATLAB has other ways of
storing both numeric and nonnumeric data, but in the beginning, it is u sually
best to think of everything as a matrix. The operations in M ATLAB are
designed to be as natural as possible. Where other programming languages
work with numbers one at a time, MATLAB allows you to work with entire
matrices quickly and easily. A good example matrix, used throughout this
book, appears in the Renaissance engraving Melencolia I by the German
artist and amateur mathematician Albrecht Dürer.
2-2
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