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Split List into Sublists with LINQ
... Dividing by three has the effect of grouping them into groups of 3. Then convert each group to a list and the IEnumerable of List to a List of Lists
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Cordova: start specific iOS emulator image
... '--stdout', logPath,
'--exit'];
return spawn('ios-sim', simArgs);
}
convert iPhone-4s, 7.1 to valid argument com.apple.CoreSimulator.SimDeviceType.iPhone-4s, 7.1 for ios-sim.
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What specific productivity gains do Vim/Emacs provide over GUI text editors?
...m gives you very specific and foolproof ways of setting file encodings and converting between them. The very first thing that impressed me about Vim is how perfectly it handles tab/space indentation options and Unix/DOS linebreaks compared to other editors that I had problems with at the time.
Man...
Convert string to nullable type (int, double, etc…)
...ullOrEmpty(s) && s.Trim().Length > 0)
{
TypeConverter conv = TypeDescriptor.GetConverter(typeof(T));
result = (T)conv.ConvertFrom(s);
}
}
catch { }
return result;
}
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What's the fastest way to merge/join data.frames in R?
...he plyr timings here. Also note that the data.table do include the time to convert to data.table and set the key, for fareness.
This answer has been updated since originally answered in Dec 2010. The previous benchmark results are below. Please see revision history of this answer to see what chan...
Map enum in JPA with fixed values?
...'ll have to use a provider extension (with Hibernate UserType, EclipseLink Converter, etc). (the second solution). ~or~
You'll have to use the @PrePersist and @PostLoad trick (the first solution). ~or~
Annotate getter and setter taking and returning the int value ~or~
Use an integer attribute at the...
Aggregate / summarize multiple variables per group (e.g. sum, mean)
...[, lapply(.SD, sum), by=.(year, month), .SDcols=c("x1","x2")]
setDF(df2) # convert back to dataframe
Using the plyr package
require(plyr)
df2 <- ddply(df1, c("year", "month"), function(x) colSums(x[c("x1", "x2")]))
Using summarize() from the Hmisc package
(column headings are messy in my ex...
How can I convert an RGB image into grayscale in Python?
I'm trying to use matplotlib to read in an RGB image and convert it to grayscale.
12 Answers
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Convert integer to binary in C#
How to convert an integer number into its binary representation?
19 Answers
19
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Generating v5 UUID. What is name and namespace?
...UUIDs
An SHA1 hash outputs 160 bits (20 bytes); the result of the hash is converted into a UUID.
With the 20-byte hash from SHA1:
SHA1 Digest: 74738ff5 5367 e958 9aee 98fffdcd1876 94028007
UUID (v5): 74738ff5-5367-5958-9aee-98fffdcd1876
^_low nibble is set to 5, t...