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Rails: select unique values from a column
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How can “while (i == i) ;” be a non-infinite loop in a single threaded application?
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How to append output to the end of a text file
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I would use printf instead of echo because it's more reliable and processes formatting such as new line \n properly.
This example produces an output similar to echo in previous examples:
printf "hello world" >> read.txt
cat read.txt
hello world
However if you...
How to convert 2D float numpy array to 2D int numpy array?
...I was looking for. astype is often too generic, and I think it probably is more useful when doing intx - inty conversions. When I want to do float - int conversion being able to choose the kind of rounding is a nice feature.
– Bakuriu
Sep 11 '12 at 7:03
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'^M' character at end of lines
...eld said, the Unix command dos2unix will help fix the problem. If you want more information, you can read the man pages for that command.
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Android add placeholder text to EditText
...ttributes that are there.
You would be surprised to see that EditText has more than 140 attributes for customization.
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Android - Activity vs FragmentActivity? [duplicate]
...tionality of Activity from FragmentActivity. In fact, FragmentActivity has more functionality.
Using FragmentActivity you can easily build tab and swap format. For each tab you can use different Fragment (Fragments are reusable). So for any FragmentActivity you can reuse the same Fragment.
Still you...
How to check if function exists in JavaScript?
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Determine the number of NA values in a column
... is.value and then using sum(is.value(df$col)) the way to go or is there a more concise direct syntax for this?
– user3274289
Jun 4 '14 at 2:11
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