optimization

问题 I would like to optimize this code in order to save memory as much as possible. My questions are: How many bytes are currently occupied for this? How many bytes can be saved by new changes? and what are those changes? The /Ox compiler option enables a combination of optimizations that favor speed. In some versions of the Visual Studio IDE and the compiler help message, this is called full optimization, but the /Ox compiler option enables only a subset of the speed optimization options enabled

问题 I am looking at having a header to a horizontal scrollable section that would have a date counter along the top, spanning the length of a year. Each date is represented by a single div. Weekends have a background color that is different than the week days. I am not using any graphics library, just straight HTML, CSS and JS. It is preferable that I do not need to change this. My goal is to make it so that the weekend background color will extend down the main body of the panel without

问题 I am trying to get rid of an inefficient set of nested for loops in python. I have an array that I will call S(f k ,f q ) that needs to be mapped onto a different array that I will call Z(f i ,α j ). The arguments are all sampling frequencies. Both arrays have the same dimensions, which are user-selected. The mapping rule is fairly straightforward: f i = 0.5 · (f k - f q ) α j = f k + f q Currently I'm performing this via a series of nested for loops: import numpy as np nrows = 64 ncolumns =

问题 I am building an array with cython element by element. I'd like to store the constant np.inf (or -1 * np.inf ) in some entries. However, this will require the overhead of going back into Python to look up inf . Is there a libc.math equivalent of this constant? Or some other value that could easily be used that's equivalent to (-1*np.inf) and can be used from Cython without overhead? EDIT example, you have: cdef double value = 0 for k in xrange(...): # use -inf here -- how to avoid referring

问题 I am building an array with cython element by element. I'd like to store the constant np.inf (or -1 * np.inf ) in some entries. However, this will require the overhead of going back into Python to look up inf . Is there a libc.math equivalent of this constant? Or some other value that could easily be used that's equivalent to (-1*np.inf) and can be used from Cython without overhead? EDIT example, you have: cdef double value = 0 for k in xrange(...): # use -inf here -- how to avoid referring

问题 I am building an array with cython element by element. I'd like to store the constant np.inf (or -1 * np.inf ) in some entries. However, this will require the overhead of going back into Python to look up inf . Is there a libc.math equivalent of this constant? Or some other value that could easily be used that's equivalent to (-1*np.inf) and can be used from Cython without overhead? EDIT example, you have: cdef double value = 0 for k in xrange(...): # use -inf here -- how to avoid referring

问题 I'm writing a program to detect primes numbers. One part is bit sieving possible candidates out. I've written a fairly fast program but I thought I'd see if anyone has some better ideas. My program could use some fast gather and scatter instructions but I'm limited to AVX2 hardware for a x86 architecture (I know AVX-512 has these though I'd not sure how fast they are). #include <stdint.h> #include <immintrin.h> #define USE_AVX2 // Sieve the bits in array sieveX for later use void sieveFactors

问题 [Not a duplicate of Structure padding and packing. That question is about how and when padding occurs. This one is about how to deal with it.] I have just realized how much memory is wasted as a result of alignment in C++. Consider the following simple example: struct X { int a; double b; int c; }; int main() { cout << "sizeof(int) = " << sizeof(int) << '\n'; cout << "sizeof(double) = " << sizeof(double) << '\n'; cout << "2 * sizeof(int) + sizeof(double) = " << 2 * sizeof(int) + sizeof(double

问题 I tried to optimize this code, but it’s impossible to optimize anymore. Please help with building a flowchart for this algorithm. A = [-1,0,1,2,3,5,6,8,10,13,19,23,45]; B = [0,1,3,6,7,8,9,12,45]; N1 = length(A); N2 = length(B); t = 1; m = 10; C = []; for i=1:N1 for j=1:N2 if A(i)==B(j) break else if j==N2 C(t)=A(i); t=t+1; end end end end disp(C); N3=length(C); R = []; y = 1; for l=1:N3 if C(l)>m R(y)=C(l); y=y+1; end end disp(R); How to find time complexity of an algorithm I think it should

问题 This question already has answers here : MS C# compiler and non-optimized code (3 answers) Closed 4 years ago . The IL code (generated with https://dotnetfiddle.net) of this piece of code: public class Program { public static void Main() { int i = 10; if (i < 4) Console.WriteLine("Hello World"); } } contains ldstr "Hello World". Shouldn't the compiler know that Console.WriteLine never gets executed? The IL code of this: public class Program { public static void Main() { if (10 < 4) Console