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How can I create an error 404 in PHP?
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die();
die() is not strictly necessary, but it makes sure that you don't continue the normal execution.
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How to combine multiple conditions to subset a data-frame using “OR”?
...< 4) , ]
Some people criticize the use of which as not needed, but it does prevent the NA values from throwing back unwanted results. The equivalent (.i.e not returning NA-rows for any NA's in V1 or V2) to the two options demonstrated above without the which would be:
new.data <- data[ !is...
What is a columnar database?
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How do Columnar Databases work?
Columnar database is a concept rather a particular architecture/implementation. In other words, there isn't one particular description on how these databases work; indeed, several are build upon t...
Why does range(start, end) not include end?
...all that parameter "count" because if you only ever use 'range(n)' then it does, of course, iterate 'n' times. This logic breaks down when you add the start parameter.
So the key point is to remember its name: "stop".
That means it is the point at which, when reached, iteration will stop immediatel...
Pipe subprocess standard output to a variable [duplicate]
...sing the subprocess module, and store the output in a variable. However, I do not want the command's output to be printed to the terminal.
For this code:
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How to write a simple Html.DropDownListFor()?
In ASP.NET MVC 2, I'd like to write a very simple dropdown list which gives static options. For example I'd like to provide choices between "Red", "Blue", and "Green".
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Why do python lists have pop() but not push()
Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use?
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How to place and center text in an SVG rectangle
...ement in which you want to center it:
If it's the parent, you could just do x="50%" y ="50%".
If it's another element, x would be the x of that element + half its width (and similar for y but with the height).
Use the text-anchor property to center the text horizontally with the value middle:
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Wrapping StopWatch timing with a delegate or lambda?
I'm writing code like this, doing a little quick and dirty timing:
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Find files and tar them (with spaces)
... repeatedly overwrite your backup.tar.gz like using tar -c with xargs will do when you have a large number of files
Also see:
GNU tar manual
How can I build a tar from stdin?, search for null
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