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Replacing column values in a pandas DataFrame
...'] could be 'male', 'female' or 'neutral', do something like this:
w = pd.concat([w, pd.get_dummies(w['female'], drop_first = True)], axis = 1])
w.drop('female', axis = 1, inplace = True)
Then you are left with two new columns giving you the dummy coding of 'female' and you got rid of the column ...
Convert array of integers to comma-separated string
...
I am using .NET 4.5. I tried to concat the comma separated numbers with a string. I got an error saying "cannot convert string[] to char". So the earlier version worked flawlessly.
– Prasanth G
Jan 30 at 12:49
...
Inno Setup for Windows service?
...ystem.Environment.UserInteractive)
{
string parameter = string.Concat(args);
switch (parameter)
{
case "--install":
ManagedInstallerClass.InstallHelper(new string[] { Assembly.GetExecutingAssembly().Location });
break;
...
How to translate between Windows and IANA time zones?
...p[ ianaZoneId ]; links = Enumerable.Repeat( canonical, 1 ).Concat( links ); did the trick for me.
– Johannes Rudolph
Jun 1 '15 at 15:46
2
...
Is it possible to dynamically compile and execute C# code fragments?
...bly. The analogy: I can create an HTML page using the DOM, or using string concats.
– Cheeso
May 14 '09 at 21:49
here'...
Convert NSArray to NSString in Objective-C
...obj in array)
{
[result appendString:[obj description]];
}
NSLog(@"The concatenated string is %@", result);
Another approach would be to do something based on each item's class:
NSMutableString * result = [[NSMutableString alloc] init];
for (NSObject * obj in array)
{
if ([obj isKindOfCla...
Join vs. sub-query
...tion level).
Nested sub-queries
SELECT moo, bar
FROM (
SELECT moo, CONCAT(roger, wilco) AS bar
FROM foo
GROUP BY moo
HAVING bar LIKE 'SpaceQ%'
) AS temp_foo
ORDER BY bar
You can nest sub-queries in multiple levels. This can help on huge datasets if you have to group o...
Find the max of two or more columns with pandas
...DataFrame(np.random.randn(5, 1000))
perfplot.show(
setup=lambda n: pd.concat([df_] * n, ignore_index=True),
kernels=[
lambda df: df.assign(new=df.max(axis=1)),
lambda df: df.assign(new=df.values.max(1)),
lambda df: df.assign(new=np.nanmax(df.values, axis=1)),
...
How to convert int to char with leading zeros?
...or SQL Server 2008 or above:
DECLARE @DesiredLenght INT = 20;
SELECT
CONCAT(
REPLICATE(
'0',
(@DesiredLenght-LEN([Column])) * (1+SIGN(@DesiredLenght-LEN([Column])) / 2) ),
[Column])
FROM Table;
Multiplication by SIGN expression is equivalent to MAX(0, ...
Is there a way to select sibling nodes?
...s(target) || [],
next = nexSiblings(target) || [];
return prev.concat(next);
}
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