output

问题 I was testing various approaches at formatting double s in C++, and here's some code I came up with: #include <chrono> #include <cstdio> #include <random> #include <vector> #include <sstream> #include <iostream> inline long double currentTime() { const auto now = std::chrono::steady_clock::now().time_since_epoch(); return std::chrono::duration<long double>(now).count(); } int main() { std::mt19937 mt(std::random_device{}()); std::normal_distribution<long double> dist(0, 1e280); static const

问题 I am getting familiarized with Octave and the function fft2() . In this toy example, I am aiming at producing the 2D DFT of the following 256 x 256 png image: To be able to understand the output easily, I try to convert this image into a 256 x 256 image, eliminating color information: Im = imread('circ.png'); pkg load image Im = rgb2gray(Im); figure, imshow(Im) After this bookkeeping preliminaries I run: A = fft2(double(Im)); OK. Now I take the same image, and analyze it with ImageJ, checking

问题 I am opening a file with open(), and need to print to that file using printf with no output to the console. How do I do this? I can successfully create the file, and printf to the console, but that is not correct. int main(int argc, char *argv[]) { int fd; char *name = "helloworld"; fd = open(name, O_CREAT); char *hi = "Hello World"; printf("%s\n", hi); close(fd); exit(0); } I need the program to have no output to the console, but if I look at the file helloworld , it should have "Hello World

问题 This question is a continuation of a previous question for loop taking too long to produce output that I asked earlier today. As advised to me in one comment, I used pandas for reading excel files in place of xlrd . Here is the program that I wrote - import pandas as pd import numpy as np no_of_columns = 10000 Book1 = pd.read_excel("D:\Python\Book1.xlsx",header=None,name=range(no_of_columns)) Book2 = pd.read_excel("D:\Python\Book2.xlsx",header=None,name=range(no_of_columns)) Book3 = pd.read

问题 To simplify, let's say I'm trying to write a command line two-way chat in Python. I would like the user to input his message with input() at the command prompt, but a listening thread could print a message at any moment. By default, this would "break" the user's input. Visually something like this: userB>Stop interuserA wrote:Hey check this out! rupting me! The closest I was able to find was this answer here which is almost, but not exactly, what I'm looking for, but it did point me towards

问题 I try to have a "live output" of a web page in a shell script ; to explain, a little example : With this "localhost/index.php" like this: <?php header('Content-type: text/html; charset=utf-8'); echo 'Start<br />'.PHP_EOL; for( $i = 0 ; $i < 10 ; $i++ ) { echo '.'; flush();ob_flush(); sleep(1); } echo PHP_EOL.'<br />End'; ?> I want to write a shell script which permit to have the "dots" on the screen that appears each second. If I try this : #!/bin/bash curl 'localhost/index.php' It shows the

问题 I'm a bloody beginner to Fortran (f90) and some apparently easy problems turn out to cause severe headaches...Thanks for helping me with this one: My code runs through a loop, processes data and writes them into a file. I'd like to have those data written in columns of the same file until the looping is finished. OPEN (unit=11,file=filename // '.csv') WRITE(11,'(i4,A1,f10.6)') NUM4 , tab, NUMfloat10_6 CLOSE(11) This code works fine for the saving of a single dataset. "tab" is defined as char

问题 I run the following R commands to make a Dunnett's test and get the summary. How can I access each row of the Linear Hypotheses below, which is part of summary output? Basically I do not know the structure of the summary. I attempted using names() but it seems not working as I do not see any named attribute to give that. library("multcomp") Group <- factor(c("A","A","B","B","B","C","C","C","D","D","D","E","E","F","F","F")) Value <- c(5,5.09901951359278,4.69041575982343,4.58257569495584,4

问题 This question already has answers here : Format string for output dependent on a variable (4 answers) Dynamic output format setting (2 answers) Closed 2 years ago . I have arrays with dynamical dimension ( dimx , dim ) and I need a way to write such arrays in a file through the Write instruction, the problem is that until now I haven't been able to produce such files in a automatic way, I mean until now I have to change the dimension of the array in the Write instruction by hand and I need a

问题 I was searching a way to get System.out.println texts and save them on a .txt file, for example: System.out.println("Java vendor: " + System.getProperty("java.vendor")); System.out.println("Operating System architecture: " + System.getProperty("os.arch")); System.out.println("Java version: " + System.getProperty("java.version")); System.out.println("Operating System: " + System.getProperty("os.name")); System.out.println("Operating System Version: " + System.getProperty("os.version")); System