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The operating system (Operating system, or OS) is a computer program that manages and controls computer hardware and software resources, is the most basic system software that runs directly on "bare metal", and any other software must be run with

In the μCOS-II system, no matter when the clock cycle occurs, μC/OS-Ⅱ will add 1 to a 32-bit counter, which is called by the user OSStart () the number starts from 0 when the initialization task and the execution of 4,294,967,295 beats are completed.

Turn from: http://blog.csdn.net/pharaohsprince/ Change it a little bit! Upload.html "Http://www.w3.org/TR/html4/loose.dtd" > Untitled Document File upload, save in C://uploadjava/lang/string.java.html "target=" _blank ">String savedirectory = "

Returns the inverse hyperbolic sine of a number by the Asinh () function. The ASIN () function returns the inverse of a different value, and the result is a radian value between-PI/2 and PI/2. The Acosh () function returns the inverse hyperbolic

Learning Μcos is one of the most important nodes I have learned since I was a student of computer science. From the use of Μcos to analysis, debugging Μcos all the source code, went through this process before I have a comprehensive and considerable

Two-layer wireless access network concept, the previous article we have introduced, the next is the specific analysis of its advantages and characteristics. For the construction of complex community networks, we need to combine existing network structures to achieve a higher standard of performance requirements. by the macro community and the microcell of the two-tier wireless access wireless network to bring us will be a future, new, perfect wirele

Positive kinematics solution of robot based on DH parameter method Two Conventions for the establishment of a coordinate system using the DH parameter method: ( 1 ) x_i and Z_ (i-1) Vertical ( 2 ) intersection of X_i and Z_ (i-1) The second transformation matrix of the coordinate system I and the coordinate system i-1 is: NBSP; A is a distance of two z-axis, and D is the distance of two x-axis. NBSP; alpha and Theta's Square conventions are:

Note: This blog post all source code is:Git Repo.1. Source code is written in Ubuntu14.04 + Indigo environment. First, the transformation matrixAfter a blog introduction, we've got Rob an arm of the d-h parameter table, as shown in the table above, we want to convert these parameters to the transformation matrix of the adjacent coordinate system, D and h two-bit old-timers have deduced a general formula, general equation 1, where cθi = cos (θ i),sθi

text daxiao = 100; // the radius of the circle yuanxin_x = 200; yuanxin_y = 150; // coordinates of the Center}; _ root. onEnterFrame = function () {a = daxiao * Math. cos (n * Math. (PI/180); B = daxiao * Math. sin (n * Math. PI/180); // define a starting point c = daxiao * Math according to the equation of the circle. cos (n + 1) * Math. PI/180); d = daxiao * Math. sin (n + 1) * Math. PI/180); // define a

Function Canon% Cripple Pachebel's Canon on Matlab% Have fun Fs = 44100; % sample rateDt = 1/fs; T16 = 0.125; T16 = [0: dt: T16];[Temp k] = size (t16 ); T4 = linspace (0, 4 * T16, 4 * k );T8 = linspace (0, 2 * T16, 2 * k ); [Temp I] = size (t4 );[Temp j] = size (t8 ); % Modification functionsMod4 = sin (pi * t4/t4 (end ));Mod8 = sin (pi * t8/t8 (end ));Mod16 = sin (pi * t16/t16 (end )); F0 = 2*146.8; % reference frequency ScaleTable = [2/3 3/4 5/6 15/16...1 9/8 5/4 4/3 3/2 5/3 9/5 15/8...2 9/4 5

1. Coordinate system:Flash coordinate system and mathematical coordinate system: the X axis is the same, and the y axis is the opposite.[Mathematical coordinate system][Coordinate system in Flash]2. Conversion between Angle and Radian:(1) radians: radians = angle * PI/180;(2) angle: angle = Radian * 180/PI;* The angle is mostly used in. _ rotation.* Radians are mostly used for sin (), cos (), atan ()......3. Sine, cosine, and tangent:1> sine: Math. si

"; i = "1"; while (number (i) Duplicatemovieclip ("point", "point" add I, 20-(i*2)); Set ("Zsort" add I, I); i = number (i) +1; } Add the following action to frame 2nd: yangle = Int (/:yangle); xangle = Int (/:xangle); i = "1"; while (number (i) Cosyangle = eval ("/:cos" add Yangle); Sinyangle = eval ("/:sin" add Yangle); Cosxangle = eval ("/:cos" add Xangle); Sinxangle = eval ("/:sin" add Xa

/* Java Script for online ellipse arc length Calculator Author: Joe Bartok Date: 10000l/2004 * URL: http://www.oocities.org/web_sketches/ellipse_notes/ellipse_arc_length/ellipse_arc_length.html Arc Length of Ellipse Scope: First quadrant, 0 Semi-axis lying on the X-axis, r =? Semi-axis lying on the Y-axis, r =? (X1> x2)... X1 =? X2 =? (? Is the input value) ------------ Onclick = "solve_arc_length ()"------------------ / Function solve_arc_length (){VaR Pi = math. PiVaR rad = PI/180.VaR f= 1000

matrix is: The verification is based on a method similar to the preceding "panning". The rotation of the image is slightly more complex: the corresponding point after the P0 (x0, y0) rotation theta angle is P (x, y). By using vectors, we get the following:x0 = R Cosα Y0 = r sinex = R cos (α+θ) = x0 cosθ-y0 sinθ y = r sin (α+θ) = x0 sinθ+ y0 cosθ So we get the matrix: What if the image rotates around a point (a, b)? Then you have to translate the c

(1) RingVertices = D1: 72 D2: 72u = from 0 to (2 * PI) d1v = from 0 to (2 * PI) D2 r = 3 * Cos (u) + 7 z = 3 * sin (u) y = r * sin (v) x = r * Cos (v) y = Y + 5 (2) random radius Ring Two methods are provided: vertices = D1:72 D2:72u = from 0 to (2*PI) D1v = from 0 to (2*PI) D2a = 10.0b = rand2(0.5, a)x = (a + b*cos(v))*sin(u)y = b*sin(v)z = (a + b*

, y), where X is multiplied by, Y to B, The matrix is: Verify according to the method similar to the previous "Translation. The image rotation is slightly complicated: The corresponding point after the θ angle is rotated by P0 (x0, y0) is p (x, y ). By using vectors, we can get the following: X0 = r cos αY0 = r sin α X = r cos (α + θ) = x0 cos θ-y0 sin θY = r sin

This section will show you how to generate a ring and various ring-related graphs, including cyclide surface, Horn torus, and tore de Klein. For related software, see: Mathematical graphics visualization tool. Use script code with custom syntax to generate mathematical graphics. I have previously written a C ++ program for generating a ring. The code is published on the Generation Algorithm of the ring graph. (1) Ring vertices = D1:72 D2:72u = from 0 to (2*PI) D1v = from 0 to (2*PI) D2r = 3*

, y0) to pan and move it to p (x, y), where X is multiplied by, Y to B, The matrix is: Verify according to the method similar to the previous "Translation. The image rotation is slightly complicated: The corresponding point after the θ angle is rotated by P0 (x0, y0) is p (x, y ). By using vectors, we can get the following: X0 = r cos αY0 = r sin α X = r cos (α + θ) = x0

), where x is multiplied by, y to B, The matrix is: Verify according to the method similar to the previous "Translation. The image rotation is slightly complicated: The corresponding point after the θ angle is rotated by P0 (x0, y0) is P (x, y ). By using vectors, we can get the following:X0 = r cos αY0 = r sin αX = r cos (α + θ) = x0 cos θ-y0 sin θY = r sin (α +

formula, we can see that C and F control the offset of X and Y respectively. A and E control X, and y coordinate multiples, soX to A, y to B,The matrix is :,The translation in the X direction is △x, and the translation in the Y direction is △y. Then, the coordinates of P (x, y) are:X = x0 + △xY = y0 + △yThe matrix expression is as follows:Moving first and then putting it big, the multiplication of the matrix is like a * B.The image rotation is slightly complicated: The corresponding point after