![]() The first line of the main function declares a variable of type MatrixXd and specifies that it is a matrix with 2 rows and 2 columns (the entries are not initialized). The statement m(0,0) = 3 sets the entry in the top-left corner to 3. You need to use round parentheses to refer to entries in the matrix. As usual in computer science, the index of the first index is 0, as opposed to the convention in mathematics that the first index is 1. The following three statements sets the other three entries. The final line outputs the matrix m to the standard output stream. Here is another example, which combines matrices with vectors. Concentrate on the left-hand program for now we will talk about the right-hand program later. The second example starts by declaring a 3-by-3 matrix m which is initialized using the Random() method with random values between -1 and 1. The next line applies a linear mapping such that the values are between 10 and 110. The function call MatrixXd::Constant(3,3,1.2) returns a 3-by-3 matrix expression having all coefficients equal to 1.2. The next line of the main function introduces a new type: VectorXd. This represents a (column) vector of arbitrary size. The one but last line uses the so-called comma-initializer, explained in Advanced initialization, to set all coefficients of the vector v to be as follows: Here, the vector v is created to contain 3 coefficients which are left uninitialized. The final line of the program multiplies the matrix m with the vector v and outputs the result. Now look back at the second example program. ![]() In the version in the left column, the matrix is of type MatrixXd which represents matrices of arbitrary size. The version in the right column is similar, except that the matrix is of type Matrix3d, which represents matrices of a fixed size (here 3-by-3). Because the type already encodes the size of the matrix, it is not necessary to specify the size in the constructor compare MatrixXd m(3,3) with Matrix3d m. ![]() Similarly, we have VectorXd on the left (arbitrary size) versus Vector3d on the right (fixed size). Note that here the coefficients of vector v are directly set in the constructor, though the same syntax of the left example could be used too. The use of fixed-size matrices and vectors has two advantages. The compiler emits better (faster) code because it knows the size of the matrices and vectors. Peer-to-peer sharing of Zero Install packages Utility for processing Zero Install feedsĬomĬreate a mirror of other Zero Install sites C++ Emacs GMPC GNOME GTK IRC KDE Lisp Lua Minetest OpenGL ROX Rails Ruby SDL Tunnel6 Tuxanci arm asm assembly audio bsd c c89 c90 cli compiler constant constant_propagation dlang documentation fast filesystem freebsd game gentoo git gnome-mirror gnu java kernel linux mail mirror mpd multimedia music network perl php python qt qt4 tcc tccboot test textmode tiny tinyc tinycc video web x86 zexosĪ free, open-source game of ancient warfareĬreate self-installing bundles for mail.Specifying the size in the type also allows for more rigorous checking at compile-time. Tool to compare DNS responses from roto n mail. comĪdult Text Adventure Framework for Flex. orgĬode for two dimensional pattern matchingĪnother attempt at creating a repo for /prog/Ī fork of msysgit/git for easier access. OrgĪbook is a text-based addressbook mpryor. netĪbstract is going to be a scalable full featu.Ī tool for SNI-based HTTPS filtering rotonmail. Simple sqlite document database cli-interface. Repository dedicated to: Audio files, in.Īcme::MetaSyntactic::buzzwords - il. c omĪcme::Tie::Eleet - Perl extension to 5pE4k. The Adaptive Distributed SDN Controller ail. comĪn interactive Imlib2 console for the X Windo.Ī gettext based translator for asciidoc documents Git mirror of the acts_as_ferret Rails plugin.ĪCX100/ACX111/TNETW1450 wireless network.Īdblock-list-backups-Frellwits-filter-lists.gitĬreate ROX application launchers for gmail. Tools for the detection of textual entailment This demo implemented the bluetooth function.Īdvanced Volume Mixer - Gnome Shell ExtensionĪ program to collect, store, and mail. Modular non-destructive audio/video processorĪn interpreter of the brainfuck la p oste. News aggregator following the UNIX philosophyĪGH_computer_science_engineering_thesis.git o rgįirmware extractors for Agere Hermes I.
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