vectorize

statement in this loop. Like what:We put the conditional statement: 12 if(data[j] >= 128)sum += data[j]; Become: 12 intt = (data[j] - 128) >> 31;sum += ~t data[j]; The "no fork" performance is basically the same as "orderly branching", whether it is a C/s, or Java. Note: under GCC, if you use the -O3 or -ftree-vectorize compile parameter, GCC will help you optimize the fork sta

, the two methods are good.RANDN (' seed ', 1); A=rand (2,2);[Ue,de,ve]=eval (' SVD (A) ');Disp (' Results by eval ');d ISP ([ue,de,ve]);d ISP (Blanks (1))[Uf,df,vf]=feval (' SVD ', A);Disp (' Results by Feval ');d ISP ([UF,DF,VF])Results by Eval-0.9193-0.3936 1.2212 0-0.7897-0.6135-0.3936 0.9193 0 0.2633-0.6135 0.7897Results by Feval-0.9193-0.3936 1.2212 0-0.7897-0.6135-0.3936 0.9193 0 0.2633-0.6135 0.78973. Inline functionsExample 7.6.3.3-1: The first form of creation of an inline function, an

1. Cyclic vectorizationMATLAB is designed for vector and matrix operations, so you can accelerate the operation of M files by Vectorization. Vectorization refers to converting a For loop and a while loop to an equivalent vector or matrix operation. An example of a loop is given below:i=0;For n = 0:0.1:1000i=i+1;Y (i) =cos (n);EndThen we can vectorize to:N= 0:0.1:1000;Y=cos (n);We can use TIC and TOC functions to see how long each of these code runs, w

Ufldl learning notes and programming job: vectorization (vectoring/vectoring) Ufldl provides a new tutorial, which is better than the previous one. Starting from the basics, the system is clear and has programming practices. In the high-quality deep learning group, you can learn DL directly without having to delve into other machine learning algorithms. So I started to do this recently. The tutorial, coupled with Matlab programming, is perfect. The address of the new tutorial is: http://ufldl.s

create some SHP files for Vectorization. This section describes how to create a SHP file.(1) Start arccatalog.You can click the yellow button on the ArcMap toolbar, or click Start> program> ArcGIS> arccatalog.(2) In the directory tree of arccatalog, click the directory to store SHP, and right-click it. The shortcut menu-> New-> SHP is displayed.In the create new shapefile dialog box, enter name, that is, the name of the SHP file.Feature type: type of SHP to be created (point, line, or surface )

allowed to execute some speculative actions. -Ftree-loop-linear Perform Linear Cyclic conversion on trees. It can improve the Buffer Performance and allow further loop optimization. -Fivopts Optimize inductive variables on trees. -Ftree-vectorize Perform cyclic vectoring on trees. -Ftracer Execute tail replication to expand the super block size, which simplifies the function control flow and all

= '(3o) ^ 2 + 100 * (Y-x ^ 2) ^ 2 ';% Convert into an inline functionF = vectorize (Inline (fstr ));% Show the topography of the objective functionRange = [-2 2-2 2];Xgrid = range (1): 0.1: range (2 );Ygrid = range (3): 0.1: range (4 );[X, y] = meshgrid (xgrid, ygrid );Surfc (X, Y, f (x, y ));% Initialize SA parameter % %% Initializing parameters and settingsT_init = 1.0; % initial temperatureT_min = 1e-10; % finial stopping Temperature% (Eg., t_min

, saving a register and shorter code. However, it is said that some machines may cause debug mode errors. The actual test shows that in gcc4.2.4Both O2 and O3 cannot enable this option.3)-fwhole-programUse the code as a final program to compile, that is, explicitly specifying that the code is not a compilation library. At this time, the compiler can use more static variables to speed up the program.4) mmx/ssex/avxMultimedia commands mainly support vector computing. Generally,-march = i686,-mmx,-

The image object calls an image file from the outside, as long as the IE can display the format. Note that VML is only used to display this image and does not vectorize the image. If it is zoomed in or out later, the image quality will change. When I first looked up msdn information about VML, the relevant menu on the left was unavailable. Does this mean that VML will be discarded by Microsoft? Because of the rise of SVG with the advant

machines may cause debug mode errors. The actual test shows that in gcc4.2.4Both O2 and O3 cannot enable this option.3)-fwhole-ProgramUse the code as a final program to compile, that is, explicitly specifying that the code is not a compilation library. At this time, the compiler can use more static variables to speed up the program.4) mmx/ssex/avxMultimedia commands mainly support vector computing. Generally,-March = i686,-MMX,-MSSE, and-msse2 are commands currently supported by machines.In add

More busy than busy more recently ... Really busy///As a rookie, do not understand why so easy to forget the basic operation of R, feel more difficult than C # JAVA, and to review again1 ##数据操作的入门2 3 ##定义一个函数判断偶数4Func function (x)5 {6 if(x% 2 = =0) {7RET 'even'8}Else9 {TenRET 'Odd' One } A return(ret) - } - the ##测试效果 -Func (35) - - ##sapply----The following code will error, the parameter can only be a numeric value +VEC ) - func (VEC) + ##这样子的代码才是正确的 A sapply (Vec,func) at - ##另外一种方法

: ... Return a + b >>> vfunc = np.vectorize (myfunc) >>> Vfunc ([1, 2, 3, 4], 2) Array ([3, 4, 1, 2]) The Vectorize function is provided primarily to convenience, not for performance. The implementation is essentially a for loop. 4.10 Smoothing Data using the Hanning function (1) Call the Hanning function to compute the weights and generate a window with a length of n (in this example n take 8) N = Int (sys.argv[1]) weights = np.hanning (n

is cross compiling ... noChecking for suffix of object files ... oChecking whether we are using the GNU C compiler ... yesChecking whether GCC accepts-g ... yesChecking for GCC option to accept ISO C89 ... none neededChecking whether GCC supports-wdeclaration-after-statement ... yesChecking whether GCC supports-wendif-labels ... yesChecking whether GCC supports-wmissing-format-attribute ... yesChecking whether GCC supports-wformat-security ... yesChecking whether GCC supports-fno-strict-aliasin