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How to debug Ruby scripts [closed]
... magnifying glass near the top right corner, choose the include? which has Array underneath it (if you don't know what class [1, 2, 3] is, type [1, 2, 3].class in irb), and you get to include? (Array), which describes what it does.
However, if the documentation doesn't help, you're more likely to g...
Automatically plot different colored lines
...NOT needed, 'Color' NOT needed. Yay!
APPENDIX
To get the ColorOrder RGB array used for the current axis,
get(gca,'ColorOrder')
To get the default ColorOrder for new axes,
get(0,'DefaultAxesColorOrder')
Example of setting new global ColorOrder with 10 colors on MATLAB start, in startup.m:
s...
Reading binary file and looping over each byte
...ime and if you need performance.
mmap allows you to treat a file as a bytearray and a file object simultaneously. It can serve as an alternative to loading the whole file in memory if you need access both interfaces. In particular, you can iterate one byte at a time over a memory-mapped file just u...
How to display unique records from a has_many through relationship?
... In Rails 5.1, I kept getting undefined method 'except' for #<Array... and it was because I used .uniq instead of .distinct
– stevenspiel
Jan 26 '18 at 21:53
add ...
Set default syntax to different filetype in Sublime Text 2
...efile-*-" and "vim:syntax=make".
...
<key>fileTypes</key>
<array>
<string>GNUmakefile</string>
<string>makefile</string>
<string>Makefile</string>
<string>OCamlMakefile</string>
<string>make</string>
&...
How do MySQL indexes work?
...index is like a mini-mirror of your table, pretty much like an associative array. If you feed it with a matching key then you can just jump to that row in one "command".
But if you didn't have that index / array, the query interpreter must use a for-loop to go through all rows and check for a match...
How do I convert between big-endian and little-endian values in C++?
... @MihaiTodor: This use of unions for typecasting through an array of chars is explicitly allowed by the standard. See eg. this question.
– Alexandre C.
May 4 '14 at 12:36
...
What do the plus and minus signs mean in Objective-C next to a method?
... for an instance method.
E.g.
// Not actually Apple's code.
@interface NSArray : NSObject {
}
+ (NSArray *)array;
- (id)objectAtIndex:(NSUInteger)index;
@end
// somewhere else:
id myArray = [NSArray array]; // see how the message is sent to NSArray?
id obj = [myArray objectAtIndex:4]; ...
How do you execute an arbitrary native command from a string?
...r. Also, I just used a hash-map, but really, you'd probably want to use an array.
Also, if you do have multiple versions of the same application installed, this uninstaller will cycle through them all at once, which confuses MsiExec.exe, so there's that too.
...
Select by partial string from a pandas DataFrame
...ns("Hello|Britain")]
and got an error:
ValueError: cannot mask with array containing NA / NaN values
you can transform NA values into False, like this:
df[df["A"].str.contains("Hello|Britain", na=False)]
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