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Center a 'div' in the middle of the screen, even when the page is scrolled up or down?
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Convert string to a variable name
...ign(varnames[1], read.csv(file_names[1]) # This will assign the variable
From there, if you try to print the variable varnames[1], it returns 'jan'.
To work around this, you need to do
print(get(varnames[1]))
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Java String remove all non numeric characters
...tring result = CharMatcher.inRange('0', '9').or(CharMatcher.is('.')).retainFrom(input);
see http://code.google.com/p/guava-libraries/wiki/StringsExplained
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HTML Script tag: type or language (or omit both)?
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Regex to match only letters
...
Use a character set: [a-zA-Z] matches one letter from A–Z in lowercase and uppercase. [a-zA-Z]+ matches one or more letters and ^[a-zA-Z]+$ matches only strings that consist of one or more letters only (^ and $ mark the begin and end of a string respectively).
If you wan...
In Java, what is the best way to determine the size of an object?
... Of course, some objects in the footprint might be shared (also referenced from other objects), so it is an overapproximation of the space that could be reclaimed when that object is garbage collected. For the result of Pattern.compile("^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$") (taken fro...
Multidimensional Array [][] vs [,] [duplicate]
...s a rectangular 3-by-3 two-dimensional array, initializing it with numbers from 0 to 8:
int [,] matrix = new int [3, 3];
for (int i = 0; i < matrix.GetLength(0); i++)
for (int j = 0; j < matrix.GetLength(1); j++)
matrix [i, j] = i * 3 + j;
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difference between throw and throw new Exception()
...e information about the error.
the second if you want to hide information (from untrusted users).
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How to maintain aspect ratio using HTML IMG tag
...by this, but not scaled beyond its original size. Though it is not certain from the opening post which of the two the OP wanted.
– Koenigsberg
Jul 31 '18 at 8:48
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How can I implode an array while skipping empty array items?
...al circumstances -- otherwise you wouldn't be able to distinguish the glue from the actual data in the array):
$array = array('one', '', '', 'four', '', 'six');
$str = implode('-', $array);
$str = preg_replace ('/(-)+/', '\1', $str);
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