Matlab Tutorials » sum

Working with 8-Bit and 16-Bit Images

matlabtutorials — Sat, 08 May 2010 14:07:04 +0000

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

Subscripts

matlabtutorials — Fri, 07 May 2010 01:15:49 +0000

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

Analysis of Functions, Interpolation, Curve Fitting, Integrals and Differential Equations 2

matlabtutorials — Tue, 23 Mar 2010 02:01:13 +0000

Localize minima and maxima of functions

Let us try to find the local minima and maxima for the function func(x). The interval of interest is [-6 0]. The algorithms are iterative. There are 2 methods to use. The first one decides x in a given interval, and the second one looks for x around an initial guess. To decide the maxima we are looking for an x that minimizes the negative function: -func(x). Read More

Matlab Tags: Analysis of Functions, applications, Command Window, curve, Define, differential, end, equations, Examples, fitting, for, format, full, Functions, grid, help, hold, if, inf, info, integral, integrals, integrand, interpolation, legend, load, matlab, mesh, meshgrid, minus, plot, polynomial, rand, randn, rem, round, sign, sum, title, tutorials, ver, what

Analysis of Functions, Interpolation, Curve Fitting, Integrals and Differential Equations

matlabtutorials — Tue, 23 Mar 2010 01:41:32 +0000

In this tutorial we will deal with analysis of functions, interpolation, curve fitting, integrals and differential equations. Firstly, we will need to use polynomials and therefore we have to be familiar with the representation of these. A general polynomial looks like: p(x)=a_nxⁿ + a_n-1x^n-1 +……….+ a₁x + a₀and is represented by a vector in Matlab:
p=[ aⁿ a^n-1 ....... a¹ a⁰ ] Read More

Matlab Tags: Analysis of Functions, continue, curve, Define, differential, end, equations, fitting, for, full, Functions, grid, gui, if, inf, integral, integrals, interpolation, load, matlab, more, plot, polynomial, quit, rem, return, sign, sum, title, tutorials, ver, what, which, xlabel, zeros

bsxfun

matlabtutorials — Sun, 06 Dec 2009 07:10:20 +0000

bsxfun – Apply element-by-element binary operation to two arrays with singleton expansion enabled
Syntax Read More

Matlab Tags: array, arrayfun, divide, division, Examples, Functions, if, ldivide, magic, matlab, mean, minus, rdivide, rem, repmat, return, sum, vectors, ver

accumarray

matlabtutorials — Wed, 09 Sep 2009 06:43:30 +0000

Construct array with accumulation Read More

Matlab Tags: accumarray, array, case, Define, end, Examples, for, full, if, length, matlab, more, repmat, return, sparse, Subscripts, sum, vectors, which

save

matlabtutorials — Wed, 12 Aug 2009 14:30:11 +0000

SAVE Save workspace variables to disk.
SAVE FILENAME saves all workspace variables to the binary “MAT-file”
named FILENAME.mat. The data may be retrieved with LOAD. If FILENAME
has no extension, .mat is assumed. Read More

Matlab Tags: abs, array, diary, end, fileformats, for, format, fprint, fprintf, fwrite, help, if, load, matlab, save, sum, uisave, variable names, variables, ver, workspace

Working with Matrices in Matlab

matlabtutorials — Tue, 04 Aug 2009 23:58:07 +0000

Generating Matrices

MATLAB software provides four functions that generate basic matrices. Read More

Matlab Tags: delete, dir, edit, Editor, end, example matrix, Examples, Expressions, fix, for, format, Functions, if, load, m-files, magic, magik, matlab, more, ones, rand, randn, rem, save, session, statements, sum, ver, which, zeros

Manipulating Matrices

matlabtutorials — Thu, 13 Mar 2008 00:10:37 +0000

Matrices and Magic Squares

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 matrices with only one row or column, which are vectors. MATLAB has other ways of storing both numeric and nonnumeric data, but in the beginning, it is usually best to think of everything as a matrix. The operations in MATLAB 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 Melancholia I by the German artist and amateur mathematician Albrecht Dürer. Read More

Matlab Tags: amateur mathematician, array, break, case, Colon Operator, Command Window, continue, diag, end, example matrix, Expressions, for, full, Functions, help, if, load, m-files, magic, magic Function, magic squares, Manipulating Matrices, matlab, mean, programming, rem, round, sign, Subscripts, sum, title, vectors, ver, what, which, workspace

while

matlabtutorials — Thu, 06 Mar 2008 16:14:52 +0000

while Repeat statements an indefinite number of times.
The general form of a while statement is: Read More

Matlab Tags: break, Controls, Define, end, for, if, matlab, rem, statements, sum, switch, while