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How to properly reuse connection to Mongodb across NodeJs application and modules
...rs). You can test it yourself quickly, but I threw a quick pen together to demo: codesandbox.io/s/awesome-water-cexno
– EddieDean
Apr 23 at 5:42
add a comment
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JavaScript curry: what are the practical applications?
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I have tried to explain it with some example and demos in my written article.
– Zaheer Ahmed
Mar 22 '14 at 15:55
6
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How to convert an enum type variable to a string?
...#include <boost/preprocessor.hpp> line, can be compiled as posted to demonstrate the solution.
This particular solution is for C++ as it uses C++-specific syntax (e.g., no typedef enum) and function overloading, but it would be straightforward to make this work with C as well.
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Using the HTML5 “required” attribute for a group of checkboxes?
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we can do this easily with html5 also, just need to add some jquery code
Demo
HTML
<form>
<div class="form-group options">
<input type="checkbox" name="type[]" value="A" required /> A
<input type="checkbox" name="type[]" value="B" required /> B
<input type="c...
Can you use CSS to mirror/flip text?
...m: scale(1, -1);
-ms-transform: scale(1, -1);
transform: scale(1, -1);
DEMO:
span{ display: inline-block; margin:1em; }
.flip_H{ transform: scale(-1, 1); color:red; }
.flip_V{ transform: scale(1, -1); color:green; }
<span class='flip_H'>Demo text &#9986;</span>
<span...
How to return PDF to browser in MVC?
I have this demo code for iTextSharp
11 Answers
11
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Efficient way to apply multiple filters to pandas DataFrame or Series
... return df[ops[op](df[col], val)]
pandas.DataFrame.filt_spec = filt_spec
Demo:
df = pd.DataFrame({'a': [1,2,3,4,5], 'b':[5,4,3,2,1]})
df.filt_spec('a', 2, 'ge')
Result:
a b
1 2 4
2 3 3
3 4 2
4 5 1
You can see that column 'a' has been filtered where a >=2.
This is slightly...
Principal component analysis in Python
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PCA using numpy.linalg.svd is super easy. Here's a simple demo:
import numpy as np
import matplotlib.pyplot as plt
from scipy.misc import lena
# the underlying signal is a sinusoidally modulated image
img = lena()
t = np.arange(100)
time = np.sin(0.1*t)
real = time[:,np.newaxis,np...
WCF service startup error “This collection already contains an address with scheme http”
...his problem, and the cause was rather silly. I was trying out Microsoft's demo regarding running a ServiceHost from w/in a Command Line executable. I followed the instructions, including where it says to add the appropriate Service (and interface). But I got the above error.
Turns out when I add...
How do I display an alert dialog on Android?
...context); // Context, this, etc.
dialog.setContentView(R.layout.dialog_demo);
dialog.setTitle(R.string.dialog_title);
dialog.show();
}
Now create Layout XML dialog_demo.xml and create your UI/design. Here is a sample one I created for demo purposes:
<?xml version="1.0" encoding="ut...