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"Data structure" sparse structure and sparse matrix compression storage, the matrix transpose

In the matrix, there is a kind of very important matrix, that is-----sparse matrix.The so-called sparse matrix, that is, in the matrix, the number of valid data is far less than the number of invalid data (and these data are not ordered in order).

Sequential increment method of sparse matrix and fast transpose method of one position

Sparse matrix: The matrix of most elements in the matrix is 0, and intuitively, when the number of non-0 elements is less than 30% of the total element, such matrices are sparse matrices.Such as:int array [6][5] = {{1, 0, 3, 0, 5},{0, 0, 0, 0, 0},{0,

Matrix-----symmetric matrices and their compressed storage && sparse matrices

What is a symmetric matrix (Symmetricmatrix)?Symmetrical symmetry-------SeeSet a n*n square a,a any element Aij, when and only if Aij = = Aji(0 Compressed storage is the matrix storage only need to store the upper triangle/lower triangle of data, so

Use GDI + to call PNG images in vc6.0 to implement a special effect window with a translucent gradient

  I. OverviewThe Application of GDI + makes it easier to program graphic images on a plane. This article uses a dialog box-based clock program as an example to call * In vc6.0 *. PNG Image implements a translucent

The "Data structure" symmetric matrix and the compressed storage of symmetric matrices

Symmetric matrices:Set a n*n square a,a any element aij, when and only if AIJ = = Aji (0 such as the following matrix:650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.

Print the matrix clockwise--20

Enter a matrix that prints each number in a clockwise order from outward. For example, enter the following matrix:1 2 3 45 6 7 89 10 11 1213 14 15 16The word 1,2,3,4,8,12,16,15,14,13,9,5,6,7,11,10 is printed in turn.In fact, printing clockwise,

Ignore events in PNG transparent regions (AS/flash)

Code : Pngloader. asview plaincopy to clipboardprint? Package net. l4cd. display {import flash. display. bitmapdata; import flash. display. loader; import flash. display. sprite; import flash. events. event; import flash. events. ioerrorevent;

Using Python to draw a obfuscation matrix (Confusion_matrix)

Summary As to the classification problem, we often need to analyze the experiment result through the visual confusion matrix to get the parameter idea, this article describes how to use Python to draw the confusing matrix (Confusion_matrix), this

[IPhone game development] iPhone game development 5: game scenario switching, dot matrix implementation, and use of Hiero tools

I. game scenario Switching In iPhone game development, there are many animations available in scenario development between games. The specific animations are as follows:   Cctransitionrotozoom // Scale down the image from large to small and

"Python" PIL image processing _ Matrix transformation

Chengshi asked to change the map, because using the PIL package to convert the picture object into a numpy matrix, interception and processing is very fun and convenient, hereby recorded:1 ImportNumPy as NP2 fromPILImportImage3

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