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With the emergence of a large number of Wi-Fi hotspots and micro-cell base stations, the era of a single large base station tower may end at this year's World Mobile Communication Conference. This year's World Mobile Communication Conference will show a variety of small base stations and Wi-Fi integrated systems.
Ip. access is one of the Infrastructure vendors in this field. The company is the manufacturer of ATT MicroCell consumer micro-cell base sta
overlapping. The satellite, the macro community, the Microcell and the Pico community cover different geographical regions. and support the mobile terminals at different speeds. Some layers belong to private operations, and some layers belong to public operations. The rate of the Pico plot exceeds 25Mbps. The coverage area is the building area, the Microcell can reach the maximum 2Mbps, the densely populat
This procedure by foreign vulture eldest brother to write, and published the source code, this is his 95 years of a work, can say was very successful at that time!
This program is clever use of the constant changes in the coordinates, so as to achieve by the stars of the box 3D rotation!
, in order to respect the copyright, I did not translate the source code annotation, this can also let the domestic assembly enthusiasts themselves pondering foreign assembly programming thinking!
; Compilation
}$ length is $l$, the vector and the $x$ axis and the $y$ axis are $\alpha$ and $\beta$ respectively, then we can easily get the coordinates of the vector is expressed as $\MATHBF = (l\cos\ Alpha, L\cos\beta) ^\text{t}$; Similarly, for three-dimensional space vector $\mathbf{b}$, its length is $l$, and the $x$ axis, the $y $ axis and the $z$ axis are $\alpha$, $\beta$ and $\gamma$, respectively, The coordin
the longitude and latitude of the second vertex B to (lonb, latb) based on the zero-degree longitude line, the longitude is a positive value (longpolling), the longitude is a negative value (-longpolling), and the latitude is 90-latitude ), when the latitude value is 90 + (90 + latitude), the two points after processing are counted as (mlona, mlata) and (mlonb, mlatb ). According to the triangle derivation, the following formula is obtained for calculating the distance between two points:
C = s
This was discovered by a boy surnamed.Boy surface.This image is similar to a Rome image and is a three-point image. It can be said that it is made of a Rome surface change.
This article will show the generation algorithms and cut diagrams of several boy surfaces, and generate mathematical graphics using script code with custom syntax. for related software, see: Mathematical graphics visualization tool. This software is free and open-source. QQ chat group: 367752815
In geometry,Boy's surfaceIs an
The idea of the C program is roughly to clarify, usually not programming, a lot of minor issues, but fortunately accompanied by a mother-in-law, quickly resolved. Draw a 16-point FFT. This is not an optimized program, but it should be the case for a clear idea. The next step is FPGA. Japanese words are not backed up yet. This week is messy, and every week is messy.
Similar to the previous program, the four-point data input is divided into eight equations in the real imaginary part.
About the ro
First, the cosine theorem is proved:Having an edge of a, B, c, the corresponding angle is a_angle, B _angle, c_angleThe following relationship can be found as a diagonal line from the point to the corresponding edge:(1)A = B * cos c_angle + c * cos B _angle(2)B = a * cos c_angle + c * cos a_angle(3)C = a *
; Center point float e[2]; Half-length, half-width}; Float Minarearec (point *pts, int ptsnum, OBB obb) {float Minarea = Flt_max; for (int i = 0, j = ptsNum-1; i Rotating caliper (rotating jam) algorithmUsing the rotary caliper algorithm can reduce the time consumption of calculating the minimum bounding rectangle of a convex polygon.Take the coordinates of the two points to form a parallel line, rotating two lines, when the line and polygon one edge coincident, the calculation of the
Not to mention nonsense:
0. Overview-Demand Analysis-function description-restrictions and defects improvement + knowledge preparation
1. essential differences between Taylor series and Fourier series, Taylor's expansion
2. Function projection and vector orthogonal
3. the derivation of the two invariant functions is e ^ X, SiNx, and cosx, Which is why Fourier conversion is required!
4. Fourier technology push process
5. Appendix references
0. In some cases, especially in image processing, the am
What is coordinate rotation?
For example, after the (blue) Ball rotates a angle around a center point and reaches the position of the (red) Ball, the coordinates of the relative center of the red ball are:
X1 = DX * Cos (a)-dy * sin ()
Y1 = Dy * Cos (A) + dx * sin ()
This is the coordinate rotation formula. If you want to reverse rotation, you need to modify the formula. There are two methods:
quantity product (magnitude), which represents the distance from the origin to the coordinate point, θ is the phase angle (phase angle), which represents the angle from the positive direction of the x-axis to a vector, and the following four formulas are the calculation methods:We can also convert polar to rectangular coordinates using the following equation:A + JB = M (cosθ+ j sinθθ)
In this equation, the left side is a Cartesian expression, and the right is a polar coordinate expression.There
a1, a2, a3, b1, b2, b3, c1, c2, c3;A1 = cos (r) * cos (t)-sin (r) * sin (s) * sin (t );A2 =-cos (r) * sin (t)-sin (r) * sin (s) * cos (t );A3 =-sin (r) * cos (s );B1 = cos (s) * sin (t );B2 =
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