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How to initialise memory with new operator in C++?
...(int i = 0; i < 10; i++)
{
p[i] = 0;
}
Using std::memset function from <cstring>
int* p = new int[10];
std::memset(p, 0, sizeof(int) * 10);
Using std::fill_n algorithm from <algorithm>
int* p = new int[10];
std::fill_n(p, 10, 0);
Using std::vector container
std::vector<...
Index all *except* one item in python
...ething similar can be achieved using itertools without numpy
>>> from itertools import compress
>>> arr = range(1,10)
>>> mask = [1]*len(arr)
>>> mask[5]=0
>>> list(compress(arr,mask))
[1, 2, 3, 4, 5, 7, 8, 9]
...
Output to the same line overwriting previous output?
... same code on Python 2.6+, put the following line at the top of the file:
from __future__ import print_function
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Fast way to get image dimensions (not filesize)
...ions also PPM, WEBP), and does only read the header.
The identify command (from ImageMagick) prints lots of image information for a wide variety of images. It seems to restrain itself to reading the header portion (see comments). It also has a unified output which file sadly lacks.
exiv2 gives you d...
Pandas count(distinct) equivalent
...This is the incorrect answer; it does not reflect the DISTINCT requirement from the question! Moreover, it does not include counts of NaN!
– Corey Levinson
Jan 23 '19 at 20:03
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When you exit a C application, is the malloc-ed memory automatically freed?
...tack, delete static variables, etc, you would eventually crash your system from memory leaks or worse.
Interesting aside to this, crashes/breaks in Ubuntu, and I suspect all other modern OSes, do have problems with "handled' resources. Sockets, files, devices, etc. can remain "open" when a program ...
How to automatically convert strongly typed enum into int?
... That's another weird example of 'we know better what you want to do' from C++ creators. Conventional (old-style) enums had tons of benefits like implicit conversion to indexes, seamless using of bitwise operations etc.. The new style enums added a really great scoping thing, but... You cannot...
What generates the “text file busy” message in Unix?
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@FelipeValdes The name is historical from the terminology of a half century ago. For example, in multics the text segment of a program was distinct from the link segment, and even earlier people talked about binary text. stackoverflow.com/a/1282540/833300
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SQL command to display history of queries
... commands here are for a single session of MySQL, e.g. you can enter these from the interactive MySQL command line. If you want them to be a permanent feature of your MySQL instance, you need to put those commands in /etc/mysql/my.cnf and restart the MySQL service.
– jeffmjack
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Getting the first and last day of a month, using a given DateTime object
...t day and last day of the month where a given date lies in. The date comes from a value in a UI field.
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