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Capture characters from standard input without waiting for enter to be pressed
...equently for me. But in C or C++, what is the best way to read a character from standard input without waiting for a newline (press enter).
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Creating a blurring overlay view
...Since that image in the screenshot is static, you could use CIGaussianBlur from Core Image (requires iOS 6). Here is sample: https://github.com/evanwdavis/Fun-with-Masks/blob/master/Fun%20with%20Masks/EWDBlurExampleVC.m
Mind you, this is slower than the other options on this page.
#import <Qua...
How to get Erlang's release version number from a shell?
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From the docs for erlang:system_info: As from OTP 17, the OTP release number corresponds to the major OTP version number. No erlang:system_info() argument gives the exact OTP version. See my answer below for an even uglier co...
What is the difference between old style and new style classes in Python?
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From New-style and classic classes:
Up to Python 2.1, old-style classes were the only flavour available to the user.
The concept of (old-style) class is unrelated to the concept of type:
if x is an instance of an o...
How to modify a global variable within a function in bash?
...(...) construct), you are creating a subshell. Subshells inherit variables from their parent shells, but this only works one way - a subshell cannot modify the environment of its parent shell. Your variable e is set within a subshell, but not the parent shell. There are two ways to pass values from ...
Is MATLAB OOP slow or am I doing something wrong?
...ava static_nop(): 0.87682 sec 8.77 usec per call
Java nop() from Java: 0.00014 sec 0.00 usec per call
MEX mexnop(): 0.11409 sec 1.14 usec per call
C nop(): 0.00001 sec 0.00 usec per call
Similar results on R2008a through R2009...
How do I measure execution time of a command on the Windows command line?
...o use for this timing run
-r specifies the keyname to remove from the database. If
keyname is followed by a comma and a number then it will
remove the slowest (positive number) or fastest (negative)
times for that keyname.
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Access nested dictionary items via a list of keys?
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Use reduce() to traverse the dictionary:
from functools import reduce # forward compatibility for Python 3
import operator
def getFromDict(dataDict, mapList):
return reduce(operator.getitem, mapList, dataDict)
and reuse getFromDict to find the location to sto...
How to remove local (untracked) files from the current Git working tree
How do you delete untracked local files from your current working tree?
38 Answers
38
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How to remove all whitespace from a string?
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I just learned about the "stringr" package to remove white space from the beginning and end of a string with str_trim( , side="both") but it also has a replacement function so that:
a <- " xx yy 11 22 33 "
str_replace_all(string=a, pattern=" ", repl="")
[1] "xxyy112233"
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