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Relative frequencies / proportions with dplyr
...nt to calculate the proportion of different values within each group. For em>x m>ample, using the mtcars data, how do I calculate the relative frequency of number of gears by am (automatic/manual) in one go with dplyr ?
...
How do you make an array of structs in C?
...nt month;
int year;
}STUDENT;
int numStudents=3;
int m>x m>;
STUDENT* students = malloc(numStudents * sizeof *students);
for (m>x m> = 0; m>x m> < numStudents; m>x m>++){
students[m>x m>].firstName=(char*)malloc(sizeof(char*));
scanf("%s",students[m>x m>].firstName);
stude...
How to create “No Activate” form in Firemonkey
In m>X m>Code by adding these methods to your NSView subclass can prevent the window from becoming active when clicking on it:
2...
How can I set the color of a selected row in DataGrid
...such as linear gradient.
<DataGrid.Resources>
<SolidColorBrush m>x m>:Key="{m>x m>:Static SystemColors.HighlightBrushKey}"
Color="#FF0000"/>
</DataGrid.Resources>
share
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Histogram Matplotlib
...
import matplotlib.pyplot as plt
import numpy as np
mu, sigma = 100, 15
m>x m> = mu + sigma * np.random.randn(10000)
hist, bins = np.histogram(m>x m>, bins=50)
width = 0.7 * (bins[1] - bins[0])
center = (bins[:-1] + bins[1:]) / 2
plt.bar(center, hist, align='center', width=width)
plt.show()
The object-...
两大桌面系统之战：Yosemite vs Windows 10 - 操作系统(内核) - 清泛网 - ...
...标准，但是 Windows 10 更新中的特性和功能是否足以和 OS m>X m> Yosemite 竞争？
全新 Windows 10 操作系统已经在 7 月 29 日正式发布。就和移动行业中的 iOS 和 Android 操作系统一样，新版本一出都免不了被互相比较的命运。今天我们...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...t, 32-bit machine)(from here):
unsigned int
reverse(register unsigned int m>x m>)
{
m>x m> = (((m>x m> & 0m>x m>aaaaaaaa) >> 1) | ((m>x m> & 0m>x m>55555555) << 1));
m>x m> = (((m>x m> & 0m>x m>cccccccc) >> 2) | ((m>x m> & 0m>x m>33333333) << 2));
m>x m> = (((m>x m> & 0m>x m>f0f0f0f0) >> 4) | ((m>x m> & 0m>x m>0...
Get IP address of visitors using Flask for Python
... then get from this same Request object, the attribute remote_addr.
Code em>x m>ample
from flask import request
from flask import jsonify
@app.route("/get_my_ip", methods=["GET"])
def get_my_ip():
return jsonify({'ip': request.remote_addr}), 200
For more information see the Werkzeug documentatio...
Split by comma and strip whitespace in Python
...as a for loop.
my_string = "blah, lots , of , spaces, here "
result = [m>x m>.strip() for m>x m> in my_string.split(',')]
# result is ["blah", "lots", "of", "spaces", "here"]
See: Python docs on List Comprehension
A good 2 second em>x m>planation of list comprehension.
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How to compare strings in Bash
...
Using variables in if statements
if [ "$m>x m>" = "valid" ]; then
echo "m>x m> has the value 'valid'"
fi
If you want to do something when they don't match, replace = with !=. You can read more about string operations and arithmetic operations in their respective document...