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How to build Qt for Visual Studio 2010
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142
First of all, it’s very important to understand that for using Qt with Visual Studio 2010, it...
What is the 
 character?
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answered Apr 4 '11 at 16:10
Justin NiessnerJustin Niessner
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Docker EXPOSE a port only to Host
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145
Sure, just bind it to localhost, like this:
docker run -p 127.0.0.1:27017:27017
Also: You...
How to sort a dataFrame in python pandas by two or more columns?
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490
As of the 0.17.0 release, the sort method was deprecated in favor of sort_values. sort was co...
difference between #if defined(WIN32) and #ifdef(WIN32)
I am compiling my program that will running on linux gcc 4.4.1 C99.
3 Answers
3
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count members with jsonpath?
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To test size of array: jsonPath("$", hasSize(4))
To count members of object: jsonPath("$.*", hasSize(4))
I.e. to test that API returns an array of 4 items:
accepted value: [1,2,3,4]
mockMvc.perform(get(API_URL))
.andExpect(jsonPath("$", hasSize(4)));
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Append column to pandas dataframe
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45
Or pd.concat([dat1, dat2], axis=1) in this case.
– DSM
Dec 16 '13 at 3:35
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How to use the 'sweep' function
...o the 2nd, etc. of the matrix you defined, you will do:
sweep (M, 1, c(1: 4), "+")
I frankly did not understand the definition in the R documentation either, I just learned by looking up examples.
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Rails Model find where not equal
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In Rails 4.x (See http://edgeguides.rubyonrails.org/active_record_querying.html#not-conditions)
GroupUser.where.not(user_id: me)
In Rails 3.x
GroupUser.where(GroupUser.arel_table[:user_id].not_eq(me))
To shorten the length, you ...
How to access pandas groupby dataframe by key
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In [21]: gb.get_group('foo')
Out[21]:
A B C
0 foo 1.624345 5
2 foo -0.528172 11
4 foo 0.865408 14
Note: This doesn't require creating an intermediary dictionary / copy of every subdataframe for every group, so will be much more memory-efficient that creating the naive d...