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When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies
...-order, in-order and post-order for a binary tree, you have to understand em>x m>actly how each traversal strategy works. Use the following tree as an em>x m>ample.
The root of the tree is 7, the left most node is 0, the right most node is 10.
Pre-order traversal:
Summary: Begins at the root (7), end...
How do I merge two dictionaries in a single em>x m>pression in Python (taking union of dictionaries)?
I have two Python dictionaries, and I want to write a single em>x m>pression that returns these two dictionaries, merged (i.e. taking the union). The update() method would be what I need, if it returned its result instead of modifying a dictionary in-place.
...
How to evaluate a math em>x m>pression given in string form?
I'm trying to write a Java routine to evaluate math em>x m>pressions from String values like:
25 Answers
...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...---BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA61Bjmfm>X m>GEvWmegnBGSuS
+rU9soUg2FnODva32D1AqhwdziwHINFaD1MVlcrYG6m>X m>RKfkcm>x m>nam>X m>GfFDWHLEvNBS
EVCgJjtHAGZIm5GL/KA86KDp/CwDFMSwluowcm>X m>wDwoyinmeOY9eKyh6aY72m>x m>Jh7n
oLBBq1N0bWi1e2i+83tm>x m>OCg4yV2oVm>X m>hBo8pYEJ8LT3el6Smm>x m>ol3C1oFMVdwPgc0v
Tl25m>X m>ucMcG/ALE/...
How to create a new object instance from a Type
...http://msdn.microsoft.com/en-us/library/system.activator.createinstance.aspm>x m>
or (new path)
https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance
Here are some simple em>x m>amples:
ObjectType instance = (ObjectType)Activator.CreateInstance(objectType);
ObjectType instance ...
Number.sign() in javascript
...er / Math.abs(number); in case number = 0
– NullUserEm>x m>ception
Oct 2 '11 at 6:27
...
How do I base64 encode (decode) in C?
..., 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'm>X m>',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
...
List comprehension vs. lambda + filter
...le (value). That is slower than accessing a local variable and in Python 2.m>x m> the list comprehension only accesses local variables. If you are using Python 3.m>x m> the list comprehension runs in a separate function so it will also be accessing value through a closure and this difference won't apply.
The...
surface plots in matplotlib
...ays.
If all you have is a list of 3d points, rather than some function f(m>x m>, y) -> z, then you will have a problem because there are multiple ways to triangulate that 3d point cloud into a surface.
Here's a smooth surface em>x m>ample:
import numpy as np
from mpl_toolkits.mplot3d import Am>x m>es3D
...
Log to the base 2 in python
... <built-in function log>
Namespace: Interactive
Docstring:
log(m>x m>[, base]) -> the logarithm of m>x m> to the given base.
If the base not specified, returns the natural logarithm (base e) of m>x m>.
In [25]: math.log(8,2)
Out[25]: 3.0
...