Logical Subscripting

May 10th, 2010 No Comments   Posted in Functions

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 same size that is the
result of some logical operation. Then X(L) specifies the elements of X where the
elements of L are nonzero. Read More

The find Function

May 9th, 2010 No Comments   Posted in Functions

The find function determines the indices of array elements that meet a given logical
condition. In its simplest form, find returns a column vector of indices. Transpose that
vector to obtain a row vector of indices. For example, Read More

Linear Algebra

May 8th, 2010 No Comments   Posted in Controls

Informally, the terms matrix and array are often used interchangeably. More precisely, a
matrix is a two-dimensional numeric array that represents a linear transformation. The
mathematical operations defined on matrices are the subject of linear algebra. Read More

Working with 8-Bit and 16-Bit Images

May 8th, 2010 No Comments   Posted in Documents

8-Bit and 16-Bit Indexed Images

Double-precision (64-bit) floating-point numbers are the default MATLAB representation for numeric data. However, to reduce memory requirements for working with images, you can store images as 8-bit or 16-bit unsigned integers using the numeric classes uint8 or uint16, respectively. An image whose data matrix has class uint8 is called an 8-bit image; an image whose data matrix has class uint16 is called a 16-bit image. Read More

The magic Function

May 8th, 2010 No Comments   Posted in Functions

MATLAB actually has a built-in function that creates magic squares of almost any size.
Not surprisingly, this function is named magic. Read More

Matlab Image Types

May 7th, 2010 No Comments   Posted in Documents

Indexed Images

An indexed image consists of a data matrix, X, and a colormap matrix, map. map is an m-by-3 array of class double containing floating-point values in the range [0, 1]. Each row of map specifies the red, green, and blue components of a single color. An indexed image uses “direct mapping” of pixel values to colormap values. The color of each image pixel is determined by using the corresponding value of X as an index into map. Values of X therefore must be integers. The value 1 points to the first row in map, the value 2 points to the second row, and so on. Display an indexed image with the statements Read More

The Colon Operator

May 7th, 2010 No Comments   Posted in Controls

The colon, :, is one of MATLAB’s most important operators. It occurs in several different
forms. The expression Read More

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