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(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*cos(v))*cos(u) #http://www.mathcurve.com/surfaces/tore/tore.shtmlvertices = D1:100 D2:100u = from 0 to (PI*2) D1v = from 0 to (PI*2) D2a = rand2(1,

than the limit, and the detailed performance is still not very good. The texture of the instrument, especially the wind instrument, is still very hard and not true, lack of music, the size after compression is 128 kb, I think the compression ratio is ~~ The m MP3 player is better than the 10X player, which can satisfy both the main listening experience and the proper size. The M player can store music for about 95 minutes, 190 m doubles to minutes of

referenced by the reference, because the reference itself is passed by reference.C. Y = 10;C. x = 10;// C is passed through ref. Here C will become a new class1C = new class1 ();}Call method:Class1 A = new class1 ();Test ();Console. writeline ("X: {0}, Y: {1}", A. X, A. Y );Class1 B = new class1 ();Test (ref B );Console. writeline ("X: {0}, Y: {1}", B. X, B. y );Output result:X: 10, Y: 10X: 0, Y: 5The output result shows the difference between using

after 5 points are taken.Plt.xticks (Np.linspace (-1, 1, 5) ) plt.show ()#gets the current axis, GCA = Get now AxisAx =PLT.GCA ()#set the right and top bordersax.spines[' Right'].set_color ('None') ax.spines['Top'].set_color ('None')#set the x axis to the bottom borderAx.xaxis.set_ticks_position ('Bottom')#set the Y axis to the left borderAx.yaxis.set_ticks_position (' Left')#set X-axis, Y-week at (0, 0) positionax.spines['Bottom'].set_position (('Data', 0)) ax.spines[' Left'].set_position (('D

cursorWord word indicates that a character is searched for a character above the cursorN (English character) is the/word of the previous action. Word is searched againN (English characters) and N are the opposite: n1,n2s/word1/word2/g N1 and N2 are numbers that are found between N1 and N2 rows Word1 use Word2 instead: 1, $s/word1/word2/g represents the use of word1 instead of word2 between the first and last lines: 1, $s/word1/word2/gc and above are the same meaning but will be user determined

Use of the wildcard function MatchesMask UsesMasks; procedure TForm1.Button1Click (Sender: TObject); vars: string; begins: = 'HTTP: // www.132435.com '; MatchesMask (s, 'HTTP ://*'); // True MatchesMask (s, 'HTTP ://*. com '); // True MatchesMask (s ,'*. com '); // True MatchesMask (s,' * .132435.com '); // True MatchesMask (s, 'HTTP: // www. *. com '); // True MatchesMask (s, 'HTTP: // www .??????. Com '); // True MatchesMask (s, 'HTTP: // www.132435 .??? '); // True // Summary: similar to wild

derivative of the equation. Written by the user. (2) convergence speed of the Newton Iteration Method: IfF (x)There is a continuous Second-Order Derivative Near zero.F (x)And the initial value x0 is close to that of ε, So Newton Iteration converges, and its convergence speed is second-order, that is, the square convergence speed. 6. Example Find the root of the following equation by Newton Method F (x) = x3 + 2x2 + 10x-20 7. Running result > A = [1

different focal lengths. This is an optical fact. Believe it? Then a specific test is performed with one 35mm shot and one 200mm shot. First, use a long camera to photograph a friend standing next to a long fence filled with flowers. Then she switched to the wide-angle camera and approached the shooting, so that she was as big as the previous image in the viewfinder. Observe these slides with a 10x magnifier and you will find that the acceptable clea

. It is very helpful to use/word with n and N! You can repeat to find some keywords you are searching! : N1, n2s/word1/word2/g N1 and n2 are numbers. Search for the word1 string between line n1 and line n2 and replace it with word2! For example, if you search for vbird between 100 and 200 and replace it with VBIRD:": 100,200 s/vbird/VBIRD/g 』. (Common) : 1, $ s/word1/word2/g Search for the word1 string from the first row to the last row and replace it with word2!

between line n1 and line n2 and replace it with word2! For example, if you search for vbird between 100 and 200 and replace it with VBIRD:": 100,200 s/vbird/VBIRD/g 』. (Common) : 1, $ s/word1/word2/g Search for the word1 string from the first row to the last row and replace it with word2! (Common) : 1, $ s/word1/word2/gc Search for the word1 string from the first row to the last row and replace it with word2! The prompt characters are displayed before replacement

document. I think that's why MongoDB cannot use join table queries ~MongoDB 2.8 (version 2.8 jumps directly to version 3.0. Why do we name 2.8 3.0? Tang jianfa said that 2.8 had been greatly enhanced, and 2.8 was a bit grievance. Therefore, the MongoDB Marketing Department named 3.0 .) The version introduces the WiredTiger storage engine MMAP that supports Latch-free and Non-blocking algorithms. Therefore, the wiredtiger parameter must be added before use. MongoDB3.0 improved: (1) Write Perform

works in a big project group. The most efficient programmer in the group is a guy with a high-bit paralysis and his mouth hitting the code with a stick, he always thinks carefully and rarely makes mistakes before writing code." 9. Neat code is better than clever code If you want others to understand your code, try to use the least code to complete the task. Follow the dry (don't repeat yourself) principle and use clearly defined objects and libraries to break down tasks into small and simple

without a plan is like a boat floating in the ocean. No one knows where it will be. Typical error 18: Give up the plan under pressure Many project teams have customized their plans, but they have to give up when they have trouble. The reason for project failure is not to discard the plan itself, but not to revise the plan in time to develop an alternative plan and put it into coding and problem handling. Typical error 19: A waste of time at the beginning of a fuzzy Project

/840becd07367e5214a1fcb2675d6eeac.png "/> (Rather than the singleton set {5}), since the maximum valueX(10X) Is 25, which happens whenX= 5.[NOTE 2] However, in case the maximum is reached at least values,Arg MaxIsSetOf points. Then, we have for example 650) This. width = 650; "class =" Tex "alt =" \ underset {x \ in [\ Pi] }{\ operatorname {Arg \, Max }}\, \ cos (x) = \ {0, 2 \ Pi, 4 \ pi \} "src =" http://upload.wikimedia.org/math/0/

here are generally in a state. If you do not need to maintain the status, you think there is not much loss in performance, so we do not need to adopt the monotonous activation mode. After all, instances are frequently created and destroyed, it will still have a certain impact on performance. For a WCF Service, the monotonous service is the best instance activation mode. The book introduces: "a powerful argument is that monotonous services are more conducive to system scalability. To better su

not exist in AO/VO. That is, if we want to call the "x" function, an error will occur no matter before or after the function is defined."X is not defined"Another typical example:alert(x); // functionvar x = 10;alert(x); // 10x = 20;function x() {};alert(x); // 20 Why does the first alert "x" return a function, and it still accesses "x" before "x" is declared? Why not 10 or 20? Because, according to the specification-when entering the context, fill in

between 100 and 200 and replace it with VBIRD: ": 100,200 s/vbird/VBIRD/g 』. (Common): 1, $ s/word1/word2/g searches for the word1 string from the first row to the last row, and replaces this string with word2! (Common): 1, $ s/word1/word2/gc searches for the word1 string from the first row to the last row, and replaces the string with word2! The prompt characters are displayed before replacement to confirm (confirm) whether to replace! (Common)Delete, copy, and pasteX, X in a row, x is to dele

instance is not created yet, both threads will create an instance. If you do not want to lock the thread to implement thread security, you can use the hunger mode (that is, an instance can be created before the main function ): # Include Running result:Singleton...~ Singleton... 6. You can also use the locking method. The details will be discussed later. 2. const member functions, const objects, and mutable Modifiers 1. const member functions The const member function does not modify the o

Scientific mode ButtonCtrl+y Press y√x button in scientific modeCtrl+b Press 3√x button in scientific modeCTRL+G Press the 10x button in scientific modeF5 Select Hex in programmer modeF6 Select Dec in programmer modeF7 Selecting the OCT in programmer modeF8 selecting Bin in Programmer modeF12 Select Qword in programmer modeF2 selecting Dword in Programmer modeF3 Select Word in programmer modeF4 Select Byte in programmer modeK Press the RoR button in

) Percent% character "%" The format can be further controlled in the following ways: %[(name)][flags][width]. [Precision]typecode (name) is named Flags can have +,-, ' or 0. + Indicates right alignment. -Indicates left alignment. ' is a space that fills a space on the left side of a positive number to align with a negative number. 0 means using 0 padding. Width indicates display widths Precision indicates the precision after the decimal point Like what: Print ("%+