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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...e above example should clearly show how slow apply can be, but just so its extra clear let's look at the most basic example. Let's square a Series of 10 million numbers with and without apply
s = pd.Series(np.random.rand(10000000))
%timeit s.apply(calc)
3.3 s ± 57.4 ms per loop (mean ± std. dev....
Why do I need to override the equals and hashCode methods in Java?
...d equals() generated by eclipse)
public class MyClass {
private final String importantField;
private final String anotherField;
public MyClass(final String equalField, final String anotherField) {
this.importantField = equalField;
this.anotherField = anotherField;
}...
How to click or tap on a TextView text
...k(View v) {
if ("Boiling Point K".equals(boilingpointK.getText().toString()))
boilingpointK.setText("2792");
else if ("2792".equals(boilingpointK.getText().toString()))
boilingpointK.setText("Boiling Point K");
}
});
...
Django's SuspiciousOperation Invalid HTTP_HOST header
...
What's the extra in this configuration? I have the server name set both in the redirects and the app section, I still get Invalid HTTP_HOST header (with Django 1.8.x)
– Csaba Toth
Jan 2 '18 at 18:3...
Conditional Variable vs Semaphore
...k object that they use to maintain mutual exclusion, but then they provide extra functionality on top of the lock for synchronizing thread execution. It's mostly up to you to figure out which one makes the most sense for your situation.
That's not necessarily the most technical description, but ...
Get controller and action name from within controller?
...
string actionName = this.ControllerContext.RouteData.Values["action"].ToString();
string controllerName = this.ControllerContext.RouteData.Values["controller"].ToString();
...
How to find serial number of Android device?
... (TelephonyManager)myActivity.getSystemService(Context.TELEPHONY_SERVICE);
String uid = tManager.getDeviceId();
getSystemService is a method from the Activity class. getDeviceID() will return the MDN or MEID of the device depending on which radio the phone uses (GSM or CDMA).
Each device MUST ...
Javascript: Extend a Function
...tion () {
old_init.apply(this, arguments);
// Do something extra
};
init.prototype = old_prototype;
}) ();
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What is the type of lambda when deduced with “auto” in C++11?
... pretty(T && t) { return __PRETTY_FUNCTION__; }, and strip off the extra if it starts to get crowded. I prefer to see the steps shown in template substitution. If you're missing __PRETTY_FUNCTION__, there are alternatives for MSVC, etc., but the results are always compiler-dependent for the ...
OS detecting makefile
...gwin/MinGW/MSYS/Windows. See his answer that looks like that:
ifeq '$(findstring ;,$(PATH))' ';'
detected_OS := Windows
else
detected_OS := $(shell uname 2>/dev/null || echo Unknown)
detected_OS := $(patsubst CYGWIN%,Cygwin,$(detected_OS))
detected_OS := $(patsubst MSYS%,MSYS,$(d...