performance will be much better if you use images as the background. This is the reason. Using vectors, the information of each pixel must be re-calculated. When using images, if the image size is the same as the background size, you only need to move the pixel information on the image to the display in the original mode without computing anything.
However,

In our process of using OpenGL and OSG, we always involve vertex coordinates and transformations of coordinates (multiplied by vectors and matrices), which is often seen as the use of column vectors in OpenGL, where the line vectors are used in OSG, Because the difference between the row vector and the column vector leads to the multiplication of the matrix with

Chapter 3: strings, vectors, and arrays, and vectors of 2017.11.12
3.1 namespace using Declaration
Std: cin indicates that the content is read from the standard input. Here, the scope operator (: :) is used to indicate that the compiler looks for the right name from the scope shown in the operator's left name.
Using declaration is the safest way.
The using Declaration has the following format:
Using namespa

theorems, namely, differential, integral, and reciprocal.[3. application scenarios]Disadvantages of linear transformation: linear transformation PCA can be used to process images. For example, 2D portrait recognition:1. We regard image A as a matrix, and further as a linear transformation matrix. We can find out the feature matrix of this training image (assuming n feature vectors with the largest energy )

linear independence removes one dimension, so at least two vectors are linearly related, so the deciding factor is 0. What is the role of the feature matrix? Change the Matrix to a positive definite matrix, that is, a = P ^-1bp. In this transformation, A is a diagonal matrix.The Study of linear algebra is to take vector and matrix as a whole, starting from the nature of some, to the overall nature, and then obtain various application and physical con

vectors are linearly related, so the deciding factor is 0. What is the role of the feature matrix? Change the Matrix to a positive definite matrix, that is, a = P ^-1bp. In this transformation, A is a diagonal matrix.The Study of linear algebra is to take vector and matrix as a whole, starting from the nature of some, to the overall nature, and then obtain various application and physical concepts from the overall nature. When matrix A is a symbol, i

Vector2d,vector3d to represent 2-dimensional, 3-dimensional vectors respectively. The structure D3dxvector2,d3dxvector3,d3dxvector4 is used to represent vectors in DirectX.Left-handedness coordinateA picture of the preface, do not know how to use the hand twisted to take a look at the figure, understand what is the left hand, what is the right hand coordinate system. In OpenGL, a right-handed coordinate sy

Image search based on shape feature vectors
Reprinted from: http://blog.csdn.net/huohunri2013/article/details/7965760
Certificate ------------------------------------------------------------------------------------------------------------------------------------------
Image Search items are as follows:
Simple image set: MPEG image set (which contains 20 classes and 20 binary images for each class ). Imag

We know that matrix multiplication corresponds to a transformation, which converts any vector into a new vector with different directions or lengths. During this transformation, the original vector mainly changes in rotation and scaling. If a matrix only performs scaling transformation on a vector or some vectors and does not rotate these vectors, these vectors a

With the development of Internet technology, the era of vector images of Android has come. In Google's newest support library v23.2, the AppCompat class has already used vector images, which reduces the AAR package by 9%, about 70KB, to all the newer applications. Of course, we can also use vector, slimming application. Vector images are the manifestation of the

Welcome to follow my GitHub and follow my csdn.
ERA in the development of technology in progress, the era of Android vector images has arrived. In Google's latest support library v23.2, the AppCompat class already uses vector imagery, which reduces the AAR package by 9% to about 70KB, benefiting all high-version applications. Of course we can also use vector, slimming applications. Vector images are th

Vector vectors in Unity related use 1Sun Guangdong 2015.10.28The following pages provide some suggestions for using vectors effectively in your code.Understanding Vector AlgorithmsVector arithmetic is the basis of 3D graphics, physics, and animation, and it is useful to have a deep understanding of it. Here are the main operations and some suggestions that can be used for a number of things in the descripti

) in three-dimensional space:(3) Euclidean distance between two n-dimensional vector A (x11,x12,..., x1n) and B (x21,x22,..., x2n):It can also be expressed in the form of a vector operation:(4) Matlab calculates Euclidean distanceMATLAB calculates distances primarily using the Pdist function. If X is a matrix of MXN, then Pdist (x) takes each row of the X matrix M as an n-dimensional vector and calculates the distance between the M vectors 22.Example:

Point multiplication:In mathematics, the quantity product (dot product; Scalar product, also known as dot product, is a two-dollar operation that accepts two vectors on the real number R and returns a scalar of real values. It is the standard inner product of Euclidean space.Defined:value of the point multiplication:The size of u, the size of V, the cosine of the u,v angle. In the premise of u,v nonzero, if the dot product is negative, then the angle

Negative vector operation: (take all the numbers in a vector negative) [ -1,-2,-3] Negative vector interpretation in geometry: ============================================================================== Vector modulo: (length of the orientation amount) 2D vector Length: 3D vector Length: [x, Y, z] seeking length = | | [x, Y, z] | | = square root (x ^ 2 + y ^ 2 + z ^2) addition and subtraction of vectors: [+] + [2,3] = [3,5] A + B! = Two total le

one, all of their development. Climb up from the groundVml+svg Development Vector Map. You do not need to import third-party images as backgrounds, directly in the map editor can be edited in the Basemap content, due to rocks, roadways, coal seams, painted Water. Based on the map and then on top of it to draw a line of wisdom and other equipment, all operation display and so on with SVG to achieve, the formation of the SVG map is naturally pure vector

The outer product of the so-called array (or vector) A and B refers to a new element that each element of a and each element of B is multiplied together to obtain. Of course, the arithmetic rules can also be defined by themselves. The outer product operator is%o% (note: The letter in the middle of the percent semicolon is the lowercase letter O). For example:> A Note that the dimension formula is:Dim (d) = C (Dim (a), dim (b))in fact, the R language provides a more generalized out-of-the-outer (

allocated constant, and the time of O (n) is required to add n elements. The other methods run at a linear time.Each ArrayList instance has a capacity (Capacity), which is the size of the array used to store the elements. This capacity can automatically increase as new elements are added, but the growth algorithm is not defined. When you need to insert a large number of elements, you can call the Ensurecapacity method before inserting to increase the capacity of the ArrayList to increase the in

A vector is a class in a java.util package that implements a function similar to a dynamic array.
Vectors and arrays are similar, you can save a set of data (a list of data). But the size of the array is fixed, and once specified, it cannot be changed, whereas vectors provide a function similar to "dynamic array", one of the important differences between vectors

ArrayList will be faster than vector, he is non-synchronous, if the design involves multi-threading, or vector betterImport java.util.*;/*** Demonstrates the use of vectors. including the creation of vectors, adding elements to vectors, removing elements from vectors,* Count the number of elements in the vector and tra

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