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Floating point vs integer calculations on modern hardware
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@JohannesSchaub-litb: SSE2 (baseline for x86-64) has packed double-precision FP. With only two 64-bit doubles per register, the potential speedup is smaller than float for code that vectorizes well. Scalar float and double use XMM registers on x86-64,...
What exactly does a jar file contain?
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JAR stands for Java ARchive. It's a file format based on the popular ZIP file format and is used for aggregating many files into one. Although JAR can be used as a general archiving tool, the primary motivation for its development was so that Java applets and their requisi...
What's the maximum value for an int in PHP?
...automatically determine when this switch to floating point needs to happen based on whether the result value of a calculation can't be represented as an integer.
PHP has no support for "unsigned" integers as such, limiting the maximum value of all integers to the range of a "signed" integer.
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How should I print types like off_t and size_t?
...77: '_snprintf_s' : format string '%jd' requires an argument of type '__int64', but variadic argument 1 has type 'off_t'"... A truely portable way is printf("%lld\n", (long long)x);
– ericcurtin
Jun 13 '18 at 16:59
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using lodash .groupBy. how to add your own keys for grouped output?
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}];
console.log(
_.chain(data)
// Group the elements of Array based on `color` property
.groupBy("color")
// `key` is group's name (color), `value` is the array of objects
.map((value, key) => ({ color: key, users: value }))
.value()
);
<script src="https://c...
Change column type from string to float in Pandas
...g to float values
0 8.0
1 6.0
2 7.5
3 3.0
4 0.9
dtype: float64
As you can see, a new Series is returned. Remember to assign this output to a variable or column name to continue using it:
# convert Series
my_series = pd.to_numeric(my_series)
# convert column "a" of a DataFrame
df["a"...
How do I integrate Ajax with Django applications?
..."
Mixin to add AJAX support to a form.
Must be used with an object-based FormView (e.g. CreateView)
"""
def render_to_json_response(self, context, **response_kwargs):
data = json.dumps(context)
response_kwargs['content_type'] = 'application/json'
return HttpRe...
AngularJS access scope from outside js function
...;
scope.$apply(function(){
scope.msg = 'Superhero';
})
}
Demo: Fiddle
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Convert JavaScript string in dot notation into an object reference
... or not. Let's assume not. Then a valid expression is a concatenation of a base identifier plus some .identifiers plus some ["stringindex"]s
This would then be equivalent to a["b"][4]["c"]["d"][1][2][3], though we should probably also support a.b["c\"validjsstringliteral"][3]. You'd have to check t...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
...duces instances that have a particular structure originated in the NDFrame base class, itself derived from the PandasContainer base class that is also a parent class of the Series class.
Note that this is correct for Pandas until version 0.12. In the upcoming version 0.13, Series will derive also f...