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Logical XOR operator in C++?
...= !(a)
– Chris Lutz
Oct 21 '09 at 0:01
6
@ChrisLutz: yes, but beware of overloaded operators.
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python pandas: apply a function with arguments to a series
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Default function arguments in Rust
... in the future.
So I wrote a proc_macro duang to implement it in the macro form.
For example:
duang! ( fn add(a: i32 = 1, b: i32 = 2) -> i32 { a + b } );
fn main() {
assert_eq!(add!(b=3, a=4), 7);
assert_eq!(add!(6), 8);
assert_eq!(add(4,5), 9);
}
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Principal component analysis in Python
...methods use the current value.
Methods:
The methods of class PCA transform vectors or arrays of e.g.
20 variables, 2 principal components and 1000 observations,
using partial matrices U' d' Vt', parts of the full U d Vt:
A ~ U' . d' . Vt' where e.g.
U' is 1000 x 2
d'...
How to handle AccessViolationException
...Exception and see if that lets you catch it.
**EDIT*
Here is some more information that might be useful (it's a long read).
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How do I fix the Visual Studio compile error, “mismatch between processor architecture”?
...|Configuration Manager menu item.
Find your project in the list, under Platform it will say "Any CPU"
Select the "Any CPU" option from the drop down and then select <New..>
From that dialog, select x86 from the "New Platform" drop down and make sure "Any CPU" is selected in the "Copy settings ...
How can I convert JSON to a HashMap using Gson?
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answered Apr 11 '13 at 7:39
cheritcherit
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How to round up to the nearest 10 (or 100 or X)?
... when x is a vector:
> roundUp(c(0.0023, 3.99, 10, 1003))
[1] 1e-02 1e+01 1e+01 1e+04
..but if you want to round to a "nice" number, you first need to define what a "nice" number is. The following lets us define "nice" as a vector with nice base values from 1 to 10. The default is set to the e...
Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?
...NaT you won't need to specify the dtype)
In [24]: s = Series([Timestamp('20130101'),np.nan,Timestamp('20130102 9:30')],dtype='M8[ns]')
In [25]: s
Out[25]:
0 2013-01-01 00:00:00
1 NaT
2 2013-01-02 09:30:00
dtype: datetime64[ns]``
In [26]: pd.isnull(s)
Out[26]:
0 False
1 ...
What does “Document-oriented” vs. Key-Value mean when talking about MongoDB vs Cassandra?
... database extends the previous model and values are stored in a structured format (a document, hence the name) that the database can understand. For example, a document could be a blog post and the comments and the tags stored in a denormalized way. Since the data are transparent, the store can do m...