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convert string array to string
...= string.Concat(test);
If you also need to add a seperator (space, comma etc) then, string.Join() should be used.
string[] test = new string[2];
test[0] = "Red";
test[1] = "Blue";
string result = string.Join(",", test);
If you have to perform this on a string array with hundereds of elements ...
get list of pandas dataframe columns based on data type
...object
dtype: object
In [13]: msk = df.dtypes == np.float64 # or object, etc.
In [14]: msk
Out[14]:
0 False
1 True
2 False
dtype: bool
You can look at just those columns with the desired dtype:
In [15]: df.loc[:, msk]
Out[15]:
1
0 2.3456
Now you can use round (or whateve...
How to sum a variable by group
... Is there anyway of maintaining an ID column? Say the categories are ordered and the ID column is 1:nrow(df), is it possible to keep the starting position of each category after aggregating? So the ID column would end up as, for example, 1, 3, 4, 7 after collapsing with aggregate. In my case ...
What's onCreate(Bundle savedInstanceState)
...
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Apply formula to the entire column
...ur single column, say B1 with an array of columns B1:B in your formula, in order for it to function. By far, this is the best method and the most dynamic.
– Shahab Yarmohammadi
May 20 '16 at 2:33
...
Captured variable in a loop in C#
...(C#, .NET 4.0].
See the following code:
Purpose is to print 1,2,3,4,5 in order.
for (int counter = 1; counter <= 5; counter++)
{
new Thread (() => Console.Write (counter)).Start();
}
The output is interesting! (It might be like 21334...)
The only solution is to use local variables.
...
Can't update Macports (with Mac OS X Mavericks)
...oceeding despite dependencies.
on each one. Luckily i made a copy of the etc and apache2/conf dirs, so should be able to get my config back when it eventually finishes... after 30 minutes or so it threw an error
Unable to open port: extra characters after close-quote
So i did self update again ...
get all keys set in memcached
... will asynchronously dump as many keys as you want. you'll get them out of order but it hits all LRU's, and unless you're deleting/replacing items multiple runs should yield the same results.
Source: GH-405.
Related:
List all objects in memcached
Writing a Redis client in pure bash (it's Redis, b...
Python append() vs. + operator on lists, why do these give different results?
...st. Specifically, it appends each of the elements of sequence in iteration order.
An aside
Being an operator, + returns the result of the expression as a new value. Being a non-chaining mutator method, list.extend() modifies the subject list in-place and returns nothing.
Arrays
I've added this due t...
Get the last non-empty cell in a column in Google Sheets
... actual last cell with actual data and this gets it whether the data is in order or not.
– Chuck Claunch
Mar 5 '17 at 3:13
4
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