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Replace None with NaN in pandas dataframe
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edited Feb 7 at 10:15
Shree
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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...ver, when k is varying, the direct approach of computing c1,...,ck is prohibitely expensive, since e.g. ck is the product of all missing numbers, magnitude n!/(n-k)!. To overcome this, perform computations in Zq field, where q is a prime such that n <= q < 2n - it exists by Bertrand's postulat...
Career day in kindergarten: how to demonstrate programming in 20 minutes? [closed]
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edited Mar 17 '10 at 15:12
community wiki
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dynamic_cast and static_cast in C++
...f type checking but maybe it will help you understand its purpose a little bit better:
struct Animal // Would be a base class in C++
{
enum Type { Dog, Cat };
Type type;
};
Animal * make_dog()
{
Animal * dog = new Animal;
dog->type = Animal::Dog;
return dog;
}
Animal * make_cat...
Iterate through the fields of a struct in Go
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nemonemo
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How to add images in select list?
...heckboxes instead of radio buttons.
Here is an example. The code may be a bit messier (specially compared to the other solutions):
.select-sim {
width:200px;
height:22px;
line-height:22px;
vertical-align:middle;
position:relative;
background:white;
border:1px solid #ccc;
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Displaying the Indian currency symbol on a website
...pee, the currency of India, was approved by the Union Cabinet on 15 July 2010.
16 Answers
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What is a good choice of database for a small .NET application? [closed]
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@JCallico I'll admit I was generalising a bit with the summary, but I doubt anyone would take what I've said as gospel.
– Adam Houldsworth
Jul 20 '11 at 7:45
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How to shorten my conditional statements
...t found, it'll return -1. Without getting into too much detail, the ~ is a bitwise NOT operator, which will return 0 only for -1.
I like using the ~ shortcut, since it's more succinct than doing a comparison on the return value. I wish JavaScript would have an in_array function that returns a Boole...
What is the largest TCP/IP network port number allowable for IPv4?
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The port number is an unsigned 16-bit integer, so 65535.
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