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./configure : /bin/sh^M : bad interpreter [duplicate]
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To fix, open your script with vi or vim and enter in vi command mode (key Esc), then type this:
:set fileformat=unix
Finally save it
:x! or :wq!
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How to determine whether a substring is in a different string
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with in: substring in string:
>>> substring = "please help me out"
>>> string = "please help me out so that I could solve this"
>>> substring in string
True
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jQuery empty() vs remove()
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empty() will empty the selection of its contents, but preserve the selection itself.
remove() will empty the selection of its contents and remove the selection itself.
Consider:
<div>
<p><strong>foo</strong></p>
</div>
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How to check iOS version?
...9, *)) {}
The full answer …
In Objective-C, and Swift in rare cases, it's better to avoid relying on the operating system version as an indication of device or OS capabilities. There is usually a more reliable method of checking whether a particular feature or class is available.
Checking fo...
Inline instantiation of a constant List
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const is for compile-time constants. You could just make it static readonly, but that would only apply to the METRICS variable itself (which should typically be Metrics instead, by .NET naming conventions). It wouldn't make the list immutable - so someone could call METRICS.Add("sh...
Declare a constant array
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An array isn't immutable by nature; you can't make it constant.
The nearest you can get is:
var letter_goodness = [...]float32 {.0817, .0149, .0278, .0425, .1270, .0223, .0202, .0609, .0697, .0015, .0077, .0402, .0241, .0675, .0751, .0193, .0009, .0599, .0633, .0906, .0276,...
“Width equals height” constraint in Interface Builder
...e' constraint, meaning 'width equals height' in Interface Builder. I guess it's possible to add such constraint programmatically. Is there something I can do in IB? Maybe I just don't see it? It seems trivial, yet I can't find it.
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Get string character by index - Java
...e any predefined method I can use to give me the character at the nth position? So in the string "foo", if I asked for the character with index 0 it would return "f".
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Inserting multiple rows in mysql
... rows. To do this, include multiple lists of column values, each enclosed within parentheses and separated by commas.
Example:
INSERT INTO tbl_name
(a,b,c)
VALUES
(1,2,3),
(4,5,6),
(7,8,9);
Source
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Subset of rows containing NA (missing) values in a chosen column of a data frame
...use =='NA' to test for missing values. Use is.na() instead. This should do it:
new_DF <- DF[rowSums(is.na(DF)) > 0,]
or in case you want to check a particular column, you can also use
new_DF <- DF[is.na(DF$Var),]
In case you have NA character values, first run
Df[Df=='NA'] <- NA
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