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Trying to SSH into an Amazon Ec2 instance - permission error
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The problem is having wrong mod on the file.
Easily solved by executing -
chmod 400 mykey.pem
Taken from Amazon's instructions -
Your key file must not be publicly viewable for SSH to work. Use this
command if needed: chmod 400 mykey.pem
400 protects it by making it read o...
Declaring javascript object method in constructor function vs. in prototype [duplicate]
...ing methods in the constructor) is that you can take advantage of closures by making use of local variables defined within the constructor in your methods. These variables are not directly accessible outside the constructor function so are effectively "private", meaning your API is cleaner than if t...
Python: Get the first character of the first string in a list?
...hings up for me:
"Losing your Loops, Fast Numerical Computing with NumPy" by PyCon 2015:
https://youtu.be/EEUXKG97YRw?t=22m22s
"NumPy Beginner | SciPy 2016 Tutorial" by Alexandre Chabot LeClerc:
https://youtu.be/gtejJ3RCddE?t=1h24m54s
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Python syntax for “if a or b or c but not all of them”
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Which translates the title of your question.
UPDATE: as correctly said by Volatility and Supr, you can apply De Morgan's law and obtain equivalent:
if (a or b or c) and not (a and b and c):
My advice is to use whichever form is more significant to you and to other programmers. The first means...
Performance surprise with “as” and nullable types
...rison. I still think the JIT code for the nullable case could be optimised by the JIT a lot more heavily than it is though.
– Jon Skeet
Jun 19 '10 at 18:21
add a comment
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How can I get zoom functionality for images?
...same as
ImageView. Example:
TouchImageView img = (TouchImageView) findViewById(R.id.img);
If you are using TouchImageView in xml, then you must provide the full package
name, because it is a custom view. Example:
<com.example.touch.TouchImageView
android:id="@+id/img”
android:layout...
When is the init() function run?
...le files, they will be executed in lexical file name order (as pointed out by @benc):
It seems that init() functions are executed in lexical file name order. The Go spec says "build systems are encouraged to present multiple files belonging to the same package in lexical file name order to a com...
Secondary axis with twinx(): how to add to legend?
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You can easily add a second legend by adding the line:
ax2.legend(loc=0)
You'll get this:
But if you want all labels on one legend then you should do something like this:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import rc
rc('m...
Eclipse count lines of code
...xport -> Other -> Metrics.
You can adjust the Lines of Code metrics by ignoring blank and comment-only lines or exclude Javadoc if you want. To do this check the tab at Preferences -> Metrics -> LoC.
That's it. There is no special option to exclude curly braces {}.
The plugin offers a...
Why do we not have a virtual constructor in C++?
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"Advanced C++" by James Coplien talks about how to implement virtual constructors in C++ (e.g., new animal("dog")). See users.rcn.com/jcoplien/Patterns/C++Idioms/… for some more information on how it's implemented
–...