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MySQL search and replace some text in a field
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Like Pring, if you're going to leave a comment like that, you might want to explain why. Was it a mistake in the original advice, or a mistake on your part? And you do know that before you make any sweeping changes to a database you ar...
jquery selector for id starts with specific text [duplicate]
...of the divs & use
$('.commonClass').
But you can use the first one if html markup is not in your hands & cannot change it for some reason.
Alternative solution - 2 (not recommended if n is a large number)
(as per @Mihai Stancu's suggestion)
$('#editDialog-0, #editDialog-1, #editDialog-...
How to get number of entries in a Lua table?
...to be implementation defined behavior. The reason it is like this is that different implementors can pick different implementation choices.
– Nakedible
Aug 9 '13 at 6:39
19
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To find whether a column exists in data frame or not
...and that your column name to check is "d", you can use the %in% operator:
if("d" %in% colnames(dat))
{
cat("Yep, it's in there!\n");
}
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How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly
I have a dataframe with ~300K rows and ~40 columns.
I want to find out if any rows contain null values - and put these 'null'-rows into a separate dataframe so that I could explore them easily.
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Check if the number is integer
... was surprised to learn that R doesn't come with a handy function to check if the number is integer.
12 Answers
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How do I fix a NoSuchMethodError?
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Without any more information it is difficult to pinpoint the problem, but the root cause is that you most likely have compiled a class against a different version of the class that is missing a method, than the one you are using when running it.
Look at the st...
Run javascript function when user finishes typing instead of on key up?
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//setup before functions
var typingTimer; //timer identifier
var doneTypingInterval = 5000; //time in ms, 5 second for example
var $input = $('#myInput');
//on keyup, start the countdown
$input.on('keyup', function () {
clearTimeout(typingTimer);
typingTimer = setTimeout(do...
Access Enum value using EL with JSTL
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For those requiring a source: This is specified (for instance) in section 1.17 of the "Expression Language Specification, version 2.2", which is part of JSR-245.
– meriton
Aug 6 '10 at 16:57
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How can I print variable and string on same line in Python?
I am using python to work out how many children would be born in 5 years if a child was born every 7 seconds. The problem is on my last line. How do I get a variable to work when I'm printing text either side of it?
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