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Difference between java.util.Random and java.security.SecureRandom
....util.Random source code (JDK 7u2), from a comment on the method protected int next(int bits), which is the one that generates the random values:
This is a linear congruential pseudorandom number generator, as
defined by D. H. Lehmer and described by Donald E. Knuth in
The Art of Compute...
Read data from SqlDataReader
... is a string, you can use .ToString(). If it is another type, you need to convert it using System.Convert.
SqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
string column = rdr["ColumnName"].ToString();
int columnValue = Convert.ToInt32(rdr["ColumnName"]);
}
...
MySQL integer field is returned as string in PHP
...ou select data from a MySQL database using PHP the datatype will always be converted to a string. You can convert it back to an integer using the following code:
$id = (int) $row['userid'];
Or by using the function intval():
$id = intval($row['userid']);
...
How to organize large R programs?
... different functionality in their own files.
But I don't like R's package system. It's rather hard to use.
I prefer a lightweight alternative, to place a file's functions inside an environment (what every other language calls a "namespace") and attach it. For example, I made a 'util' group of fu...
How can I convert a datetime object to milliseconds since epoch (unix time) in Python?
I have a Python datetime object that I want to convert to unix time, or seconds/milliseconds since the 1970 epoch.
13 Ans...
Is unsigned integer subtraction defined behavior?
...he result of the addition is unsigned int. Then that result is implicitly converted to the type required in context, a conversion which fails because the value is not representable in the new type.
– Ben Voigt
Oct 14 '15 at 3:20
...
SFTP in Python? (platform independent)
...s most common use cases to just a few lines of code.
import pysftp
import sys
path = './THETARGETDIRECTORY/' + sys.argv[1] #hard-coded
localpath = sys.argv[1]
host = "THEHOST.com" #hard-coded
password = "THEPASSWORD" #hard-coded
username = "THEUSERNAME" ...
How to read the RGB value of a given pixel in Python?
...
photo = Image.open('IN.jpg') #your image
photo = photo.convert('RGB')
width = photo.size[0] #define W and H
height = photo.size[1]
for y in range(0, height): #each pixel has coordinates
row = ""
for x in range(0, width):
RGB = photo.getpixel((x,y))
R,G,...
Sort a single String in Java
...
No there is no built-in String method. You can convert it to a char array, sort it using Arrays.sort and convert that back into a String.
String test= "edcba";
char[] ar = test.toCharArray();
Arrays.sort(ar);
String sorted = String.valueOf(ar);
Or, when you want to dea...
Why do Python's math.ceil() and math.floor() operations return floats instead of integers?
...vident in your comment:
The whole point of ceil/floor operations is to convert floats to integers!
The point of the ceil and floor operations is to round floating-point data to integral values. Not to do a type conversion. Users who need to get integer values can do an explicit conversion fo...