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How to append rows to an R data frame
...icrobenchmark" package will give us more comprehensive insight than system.time:
library(microbenchmark)
microbenchmark(f1(1000), f3(1000), f4(1000), times = 5)
# Unit: milliseconds
# expr min lq median uq max neval
# f1(1000) 1024.539618 1029.693877 1045...
How to convert SecureString to System.String?
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Use the System.Runtime.InteropServices.Marshal class:
String SecureStringToString(SecureString value) {
IntPtr valuePtr = IntPtr.Zero;
try {
valuePtr = Marshal.SecureStringToGlobalAllocUnicode(value);
return Marshal.PtrToStringUni...
Iterate through object properties
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Girls and guys we are in 2019 and we do not have that much time for typing... So lets do this cool new fancy ECMAScript 2016:
Object.keys(obj).forEach(e => console.log(`key=${e} value=${obj[e]}`));
shar...
Writing a list to a file with Python
...he square brackets [], so that the strings to be printed get made one at a time (a genexp rather than a listcomp) -- no reason to take up all the memory required to materialize the whole list of strings.
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How to send an email with Python?
...w your constant advertising for yagmail (yes, Sir, I will consider it next time, Sir ;). But I find it very confusing that almost no one seems to care for OPs issue, but rather suggests much different solutions. It's as if I am asking how to change bulbs in my 2009 smart and the answer is: Buy a rea...
What do I have to do to get Core Data to automatically migrate models?
... with two different entities xxx" even after cleaning up the build several times...Your might have issues with how the managedObjectModel is being loaded...take at look at this one...which helped me fix it..
core data migration problems
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Using os.walk() to recursively traverse directories in Python
...r.py: ..."""
__author__ = "legendmohe"
import os
import argparse
import time
class FileTreeMaker(object):
def _recurse(self, parent_path, file_list, prefix, output_buf, level):
if len(file_list) == 0 \
or (self.max_level != -1 and self.max_level <= level):
...
How can I get a count of the total number of digits in a number?
...ve implemented before editing this question (it had to be edited a million times already), there was a specific case pointed out by @GyörgyKőszeg, in which the IF-CHAIN method performs slower than the LOG10 method.
This still happens, although the magnitude of the difference became much lower aft...
How to read the Stock CPU Usage data
...cle about this.
The numbers show the average load of the CPU in different time intervals. From left to right: last minute/last five minutes/last fifteen minutes
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Parsing a comma-delimited std::string [duplicate]
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Input one number at a time, and check whether the following character is ,. If so, discard it.
#include <vector>
#include <string>
#include <sstream>
#include <iostream>
int main()
{
std::string str = "1,2,3,4,5,6";
...