Matlab Tutorials » matlabtutorials http://www.matlabtutorials.com Matlab tutorials and examples Mon, 10 May 2010 10:55:51 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 Logical Subscripting http://www.matlabtutorials.com/functions/logical-subscripting.html http://www.matlabtutorials.com/functions/logical-subscripting.html#comments Mon, 10 May 2010 10:55:51 +0000 matlabtutorials http://www.matlabtutorials.com/?p=528 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

Matlab Tags: Dürer's, Dürer's magic square, finite, isprime, logical, Logical Subscripting, magic, Subscripting]]> http://www.matlabtutorials.com/functions/logical-subscripting.html/feed 0 The find Function http://www.matlabtutorials.com/functions/the-find-function.html http://www.matlabtutorials.com/functions/the-find-function.html#comments Sat, 08 May 2010 23:52:07 +0000 matlabtutorials http://www.matlabtutorials.com/?p=525 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

Matlab Tags: array, find, function, matlab, matrix, transpose, vector]]> http://www.matlabtutorials.com/functions/the-find-function.html/feed 0 Linear Algebra http://www.matlabtutorials.com/controls/linear-algebra.html http://www.matlabtutorials.com/controls/linear-algebra.html#comments Sat, 08 May 2010 19:23:52 +0000 matlabtutorials http://www.matlabtutorials.com/?p=522 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

Matlab Tags: Dürer's, Dürer's magic square, Linear Algebra, magic, magic squares, matlab, matrix]]> http://www.matlabtutorials.com/controls/linear-algebra.html/feed 0 Working with 8-Bit and 16-Bit Images http://www.matlabtutorials.com/documents/working-with-8-bit-and-16-bit-images.html http://www.matlabtutorials.com/documents/working-with-8-bit-and-16-bit-images.html#comments Sat, 08 May 2010 14:07:04 +0000 matlabtutorials http://www.matlabtutorials.com/?p=507 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

Matlab Tags: 16-Bit, 8-Bit, Arithmetic Operations on Integer Classes, brighten, cat, colormap, conv2, convn, double, fft2, fftn, find, image, imagesc, imread, imwrite, matlab, permute, reshape, sum, tutorials]]> http://www.matlabtutorials.com/documents/working-with-8-bit-and-16-bit-images.html/feed 0 The magic Function http://www.matlabtutorials.com/functions/the-magic-function.html http://www.matlabtutorials.com/functions/the-magic-function.html#comments Sat, 08 May 2010 03:21:25 +0000 matlabtutorials http://www.matlabtutorials.com/?p=518 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 Tags: Colon Operator, Dürer's, Expressions, magic, matlab, order]]> http://www.matlabtutorials.com/functions/the-magic-function.html/feed 0 Matlab Image Types http://www.matlabtutorials.com/documents/matlab-image-types.html http://www.matlabtutorials.com/documents/matlab-image-types.html#comments Fri, 07 May 2010 09:02:54 +0000 matlabtutorials http://www.matlabtutorials.com/?p=501 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

Matlab Tags: CDataMapping, Graphics, image, imagesc, matlab, Support, Technical Note 1201: The Technical Support Guide to Graphics Rendering and Troubleshooting]]> http://www.matlabtutorials.com/documents/matlab-image-types.html/feed 0 The Colon Operator http://www.matlabtutorials.com/controls/the-colon-operator.html http://www.matlabtutorials.com/controls/the-colon-operator.html#comments Fri, 07 May 2010 01:18:33 +0000 matlabtutorials http://www.matlabtutorials.com/?p=515 The colon, :, is one of MATLAB’s most important operators. It occurs in several different
forms. The expression Read More

Matlab Tags: Colon Operator, matlab, operator, Subscripts, The magic Function]]> http://www.matlabtutorials.com/controls/the-colon-operator.html/feed 0 Subscripts http://www.matlabtutorials.com/functions/subscripts.html http://www.matlabtutorials.com/functions/subscripts.html#comments Fri, 07 May 2010 01:15:49 +0000 matlabtutorials http://www.matlabtutorials.com/?p=512 The element in row i and column j of A is denoted by A(i,j). For example, A(4,2) is the number in the fourth row and second column. For our magic square, A(4,2) is 15. So it is possible to compute the sum of the elements in the fourth column of A by typing Read More

Matlab Tags: diag, Subscripts, sum, The Colon Operator, transpose]]> http://www.matlabtutorials.com/functions/subscripts.html/feed 0 Working with Images in MATLAB Graphics http://www.matlabtutorials.com/documents/working-with-images-in-matlab-graphics.html http://www.matlabtutorials.com/documents/working-with-images-in-matlab-graphics.html#comments Thu, 06 May 2010 23:02:30 +0000 matlabtutorials http://www.matlabtutorials.com/?p=499 What Is Image Data?

The basic MATLAB data structure is the array, an ordered set of real or complex elements. An array is naturally suited to the representation of images, real-valued, ordered sets of color or intensity data. (An array is suited for complex-valued images.) Read More

Matlab Tags: axis, Graphics, image, Images, imagesc, imfinfo, imread, imwrite, ind2rgb, matlab, Working with 8-Bit and 16-Bit Images]]> http://www.matlabtutorials.com/documents/working-with-images-in-matlab-graphics.html/feed 0 Stream Line Plots of Vector Data http://www.matlabtutorials.com/examples/stream-line-plots-of-vector-data.html http://www.matlabtutorials.com/examples/stream-line-plots-of-vector-data.html#comments Sun, 02 May 2010 19:41:48 +0000 matlabtutorials http://www.matlabtutorials.com/?p=492 Wind Mapping Data

The MATLAB vector data set called wind represents air currents over North America. This example uses a combination of techniques: Read More

Matlab Tags: axis, Color, coneplot, contourslice, daspect, EdgeColor, FaceColor, LineWidth, load, matlab, max, meshgrid, min, plot, slice, sqrt, streamline, view]]> http://www.matlabtutorials.com/examples/stream-line-plots-of-vector-data.html/feed 0