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MySQL - How to select data by string length
...ing for CHAR_LENGTH() to get the number of characters in a string.
For multi-byte charsets LENGTH() will give you the number of bytes the string occupies, while CHAR_LENGTH() will return the number of characters.
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Delete element in a slice
...guy7 from the spec: "For arrays or strings, the indices are in range if 0 <= low <= high <= len(a), otherwise they are out of range." Maybe in your case high < low; in that case you'll get the error. (golang.org/ref/spec#Slice_expressions)
– mlg
Jan...
Quickly create a large file on a Linux system
...time!) In the end though, dd is a poor choice (though essentially the default used by the VM "create" GUIs). E.g:
dd if=/dev/zero of=./gentoo_root.img bs=4k iflag=fullblock,count_bytes count=10G
truncate is another choice -- and is likely the fastest... But that is because it creates a "sparse fi...
Which Java Collection should I use?
...se memory performance. The memory overhead of the List itself is usually (although not always) small compared to that of the elements it contains as well.
– Tim B
Mar 23 '14 at 11:06
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How do I pass an object from one activity to another on Android? [duplicate]
I need to be able to use one object in multiple activities within my app, and it needs to be the same object. What is the best way to do this?
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How to increase font size in a plot in R?
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cex is the magnification factor. The default value is 1. If you need to specify font sizes, you had better be prepared to dig into the documentation starting with ?Devices, ?pdfFonts, ?pdf, ?embedFonts, and many others.
– IRTFM
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Difference between map, applymap and apply methods in Pandas
... 2:'b', 3:'c'}))
applymap is good for elementwise transformations across multiple rows/columns (e.g., df[['A', 'B', 'C']].applymap(str.strip))
apply is for applying any function that cannot be vectorised (e.g., df['sentences'].apply(nltk.sent_tokenize))
Summarising
Footnotes
map...
String replacement in Objective-C
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If you want multiple string replacement:
NSString *s = @"foo/bar:baz.foo";
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"/:."];
s = [[s componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedBy...
How Do I Document Packages in Java?
...tory for that package). This should be a fully-formed HTML file, with the <html> tag defined in it
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How to put more than 1000 values into an Oracle IN clause [duplicate]
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This works because this is a multi-value comparison IN list. Oracle implemented this multi-value comparison IN list with a limit of < 100,000 rather than the 1,000 in the normal IN list. So the first value val1 is 'magic', this could have been a colum...