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pyplot scatter plot marker size
... size but you are basically specifying the area of the marker. This means, to double the width (or height) of the marker you need to increase s by a factor of 4. [because A = WH => (2W)(2H)=4A]
There is a reason, however, that the size of markers is defined in this way. Because of the scaling o...
When should I use malloc in C and when don't I?
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char *some_memory = "Hello World";
is creating a pointer to a string constant. That means the string "Hello World" will be somewhere in the read-only part of the memory and you just have a pointer to it. You can use the string as read-only. You cannot make changes to it. Example:
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When to use symbols instead of strings in Ruby?
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TL;DR
A simple rule of thumb is to use symbols every time you need internal identifiers. For Ruby < 2.2 only use symbols when they aren't generated dynamically, to avoid memory leaks.
Full answer
The only reason not to use them for identifiers that are...
Reloading the page gives wrong GET request with AngularJS HTML5 mode
I want to enable HTML5 mode for my app. I have put the following code for the configuration, as shown here :
24 Answers
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How to get ID of the last updated row in MySQL?
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I've found an answer to this problem :)
SET @update_id := 0;
UPDATE some_table SET column_name = 'value', id = (SELECT @update_id := id)
WHERE some_other_column = 'blah' LIMIT 1;
SELECT @update_id;
EDIT by aefxx
This technique can be further...
Undo a Git merge that hasn't been pushed yet
... did a git merge some-other-branch locally, but never pushed the changes to origin master. I didn't mean to merge, so I'd like to undo it. When doing a git status after my merge, I was getting this message:
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How to exit in Node.js
What is the command that is used to exit? (i.e terminate the Node.js process)
19 Answers
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Is it expensive to use try-catch blocks even if an exception is never thrown?
We know that it is expensive to catch exceptions. But, is it also expensive to use a try-catch block in Java even if an exception is never thrown?
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Convert Java Array to Iterable
...r
Iterable<Integer> iterable = Arrays.asList(foo);
Though you need to use an Integer array (not an int array) for this to work.
For primitives, you can use guava:
Iterable<Integer> fooBar = Ints.asList(foo);
<dependency>
<groupId>com.google.guava</groupId>
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Searching subversion history (full text)
Is there a way to perform a full text search of a subversion repository, including all the history?
16 Answers
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