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Apache Spark: map vs mapPartitions?
...difference between an RDD's map and mapPartitions method?
The method map converts each element of the source RDD into a single element of the result RDD by applying a function. mapPartitions converts each partition of the source RDD into multiple elements of the result (possibly none).
And doe...
Why do std::shared_ptr work
...t>, given the way you constructed it, is the normal one for Test, which converts the pointer to Test* and deletes it.
When you push your shared_ptr<Test> into the vector of shared_ptr<void>, both of those are copied, although the first one is converted to void*.
So, when the vector ...
Truncate Two decimal places without rounding
...function for real-world usage of truncating a decimal in C#. This could be converted to a Decimal extension method pretty easy if you wanted:
public decimal TruncateDecimal(decimal value, int precision)
{
decimal step = (decimal)Math.Pow(10, precision);
decimal tmp = Math.Truncate(step * va...
constant pointer vs pointer on a constant value [duplicate]
...arse these type of declarations. I also recommend cdecl.org as a site that converts declarations, for example int (*(*foo)(void))[3], into meaningful English text ("declare foo as pointer to function (void) returning pointer to array 3 of int").
– jarmod
Jul 5 ...
std::string formatting like sprintf
... line explanation:
Aim: Write to a char* by using std::snprintf and then convert that to a std::string.
First, we determine the desired length of the char array using a special condition in snprintf. From cppreference.com:
Return value
[...] If the resulting string gets truncated due to ...
What is the best collation to use for MySQL with PHP? [closed]
...Ø Å are the last 3 of the alphabet. With utf8_general_ci, Ø and Å gets converted to O and A, which puts them in the completely wrong position when sorted (I am not sure how Æ is handled, as it is a ligature, not an accented character). This sort order is different in almost any language, e.g. N...
Why can Java Collections not directly store Primitives types?
...store an int in a List<Integer> the Java compiler will automatically convert it to an Integer.
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Exif manipulation library for python [closed]
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Use PIL :)
import os,sys
from PIL import Image
from PIL.ExifTags import TAGS
if __name__ == '__main__':
for (k,v) in Image.open(sys.argv[1])._getexif().iteritems():
print '%s = %s' % (TAGS.get(k), v)
os.system('pause')
...
How do I remove repeated elements from ArrayList?
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Although converting the ArrayList to a HashSet effectively removes duplicates, if you need to preserve insertion order, I'd rather suggest you to use this variant
// list is some List of Strings
Set<String> s = new LinkedHashSe...
Passing arguments to C# generic new() of templated type
...structorParameters = parameters.Select((paramType, index) =>
// convert the object[index] to the right constructor parameter type.
Expression.Convert(
// read a value from the object[index]
Expression.ArrayAccess(
paramExpr,
...