9/14/2023 0 Comments Eigenmath 4a androidThis 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. Added optional session persistence (console messages, command history, and variables are automatically saved when exiting, and restored when opening) Fixed reboot/system error when trying to copy the last result at a point when Eigenmath was yet to run Version 1.Specifying the size in the type also allows for more rigorous checking at compile-time. Usage of a specific folder in storage memory for all Eigenmath data files, including the startup script Roots (anything with exponent in the form 1/x) are pretty-printed, along with brackets Greek letter names (alpha, beta, pi, theta, etc.) are shown as actual Greek characters Command history entries doubled from 20 to 40, and maximum command length reduced from 1000 characters to a sensible 500. Support for partial command input (press Shift+EXE) Better text input (for example, the cursor is no longer locked at the right of the screen when editing long commands) Different memory management, basically there are two 128 KB heaps now (the OS one plus another on the stack), each is used for different kinds of data. The current input is no longer cleared when pressing a custom key (and the handler is on), or when loading a script Fixed nroots function (broken since at least Beta 8, possibly since Beta 5 or earlier, had to do with compiler (mis)optimizations so I'm not sure if the older binaries had the problem) Fixed excessive memory usage/possible overflow when recording a script Fixed bug where graph mode would not be completely left when the user exited it Practical takeout: there is now space for more symbols and more complex contents on those symbols, without taking out space for computations with them. Usage instructions: see (lots of screenshots!) Many other bug fixes, optimizations and cosmetic changes. Migrating from previous versions: apart from replacing the g3a, if you have a startup script, you need to create a folder called on the root of the storage memory (that is, out of any folders) and move the startup script there. The folder will also contain two files needed for session persistence. the same thing, but packaged in a nice ZIP with readme, license and startup script: (which doesn't include the startup script or a readme, it's just the g3a) To disable session persistence (doesn't automatically delete the storage memory files), press Shift then Menu and change the "Save Session" setting. Or soon, from your favorite calculator archives.Īs I explained before, since this is a stable release, feel free to redistribute it - but, if uploading e.g. to file archives, please redistribute the ZIP and not just the g3a. For transferring from one calc to another, sending just the g3a is fine, of course. If you're still using a really old version, like the first Betas, it will look like a massive upgrade to your calculator. Especially, if you are still using the Beta 1 (which certain sites were still redistributing until recently), it will look like a upgrade from a almost-falling-apart-bike to a solid supersonic jet (make sure to read the usage instructions so you don't miss any feature).
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