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return query based on date
...ate:
db.gpsdatas.find({"createdAt" : { $gte : new ISODate("2012-01-12T20:15:31Z") }});
I'm using $gte (greater than or equals), because this is often used for date-only queries, where the time component is 00:00:00.
If you really want to find a date that equals another date, the syntax would be
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Declare slice or make slice?
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95
In addition to fabriziom's answer, you can see more examples at "Go Slices: usage and internals"...
Precedence and bitmask operations
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150
You are actually doing this:
var_dump(0b10 & (0b01 == 0));
var_dump(0b10 & (0b01 != 0)...
How to get the last N rows of a pandas DataFrame?
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Wes McKinneyWes McKinney
75.8k2525 gold badges129129 silver badges104104 bronze badges
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Rename Pandas DataFrame Index
...so here are some more examples:
In [1]: df = pd.DataFrame([[1, 2, 3], [4, 5 ,6]], columns=list('ABC'))
In [2]: df
Out[2]:
A B C
0 1 2 3
1 4 5 6
In [3]: df1 = df.set_index('A')
In [4]: df1
Out[4]:
B C
A
1 2 3
4 5 6
You can see the rename on the index, which can change...
Create a variable name with “paste” in R?
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125
You can use assign (doc) to change the value of perf.a1:
> assign(paste("perf.a", "1", sep="...
Uninstall old versions of Ruby gems
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Steven Penny
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answered May 5 '11 at 18:33
Dylan MarkowDylan...
Breaking loop when “warnings()” appear in R
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152
You can turn warnings into errors with:
options(warn=2)
Unlike warnings, errors will interru...
How do I declare and initialize an array in Java?
...d(0, 100).toArray(); // From 0 to 100
int [] myIntArray = IntStream.of(12,25,36,85,28,96,47).toArray(); // The order is preserved.
int [] myIntArray = IntStream.of(12,25,36,85,28,96,47).sorted().toArray(); // Sort
For classes, for example String, it's the same:
String[] myStringArray = new Strin...
Error: Could not create the Java Virtual Machine Mac OSX Mavericks
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305
Normally this error occurs when you invoke java by supplying the wrong arguments/options. In thi...