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Why does Math.Round(2.5) return 2 instead of 3?
...divide trickery to achieve the same effect:
c = System.Math.Truncate (n * 100) / 100; // 3.14
d = System.Math.Ceiling (n * 100) / 100; // 3.15
(a) Of course, that theory depends on the fact that your data has an fairly even spread of values across the even...
Freeze the top row for an html table only (Fixed Table Header Scrolling) [duplicate]
...to fix, but the first row of data, the concept is still the same. I wasn't 100% which you were referring to.
Additional thought
I was tasked by my company to research a solution for this that could function in IE7+, Firefox, and Chrome.
After many moons of searching, trying, and frustration it rea...
How to align a to the middle (horizontally/width) of the page [duplicate]
...then by adding margin-top to the negative of the height of the div, i.e., -100 shifts it above by 100 and similarly for margin-left. This gets the div exactly in the center of the page.
#outPopUp {
position: absolute;
width: 300px;
height: 200px;
z-index: 15;
top: 50%;
left: 5...
How do I make a transparent border with CSS?
...ase you can use rgba, where a stands for alpha.
.your_class {
height: 100px;
width: 100px;
margin: 100px;
border: 10px solid rgba(255,255,255,.5);
}
Demo
Here, you can change the opacity of the border from 0-1
If you simply want a complete transparent border, the best thing to...
Best data type for storing currency values in a MySQL database
... way). To get an idea, take the amount of the transactions (let's suppose $100.23) and multiple by 100, 1000, 10000, etc. to get the accuracy you need. So if you only need to store cents and can safely round up or down, just multiply by 100. In my example, that would make 10023 as the integer to sto...
Force R not to use exponential notation (e.g. e+10)?
... than ‘scipen’ digits wider.
Example:
R> ran2 <- c(1.810032e+09, 4)
R> options("scipen"=-100, "digits"=4)
R> ran2
[1] 1.81e+09 4.00e+00
R> options("scipen"=100, "digits"=4)
R> ran2
[1] 1810032000 4
That said, I still find it fudgeworthy. The most direct w...
java get file size efficiently
...");
}
}
return (System.nanoTime() - before) / 1000;
}
}
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MySql: Tinyint (2) vs tinyint(1) - what is the difference?
...-+-----+-----+-----+
| 1 | 1 | 1 | 1 |
| 10 | 10 | 10 | 10 |
| 100 | 100 | 100 | 100 |
Here a, b and c are using TINYINT(1), TINYINT(2) and TINYINT(3) respectively. As you can see, it pads the values on the left side using the display width.
It's important to note that it does not aff...
How unique is UUID?
...r words, only after generating 1 billion UUIDs every
second for the next 100 years, the probability of creating just one
duplicate would be about 50%.
Caveat:
However, these probabilities only hold when the UUIDs are generated
using sufficient entropy. Otherwise, the probability of dupli...
how do you filter pandas dataframes by multiple columns
...one from @redreamality):
import pandas as pd
import numpy as np
length = 100_000
df = pd.DataFrame()
df['Year'] = np.random.randint(1950, 2019, size=length)
df['Gender'] = np.random.choice(['Male', 'Female'], length)
%timeit df.query('Gender=="Male" & Year=="2014" ')
%timeit df[(df['Gender']=...