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Check if an array is empty or exists
When the page is loading for the first time, I need to check if there is an image in image_array and load the last image.
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Test if a vector contains a given element
...irst appearance) and %in% (returns a Boolean) functions are designed for this.
v <- c('a','b','c','e')
'b' %in% v
## returns TRUE
match('b',v)
## returns the first location of 'b', in this case: 2
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How do I detect unsigned integer multiply overflow?
...ine each time on a , b and ab to check if the digits condition was satisfied.
31 Answers
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Why is #!/usr/bin/env bash superior to #!/bin/bash?
I've seen in a number of places, including recommendations on this site ( What is the preferred Bash shebang? ), to use #!/usr/bin/env bash in preference to #!/bin/bash . I've even seen one enterprising individual suggest using #!/bin/bash was wrong and bash functionality would be lost by doing...
Access to the path is denied
I know this question was asked many times here, but I can't find a solution to my problem.
I'm trying to save image to the folder in .net c# but get this exception:
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How to append one file to another in Linux from the shell?
... append the contents of file2 to file1 so that contents of file1 persist the process?
8 Answers
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Good way of getting the user's location in Android
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Looks like we're coding the same application ;-)
Here is my current implementation. I'm still in the beta testing phase of my GPS uploader app, so there might be many possible improvements. but it seems to work pretty well so far.
/**
* try to get the 'best' location selected ...
When should one use a 'www' subdomain?
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There are a ton of good reasons to include it, the best of which is here:
Yahoo Performance Best Practices
Due to the dot rule with cookies, if you don't have the 'www.' then you can't set two-dot cookies or cross-subdomain cookies a la *.example.com. There are two pertinent impacts.
F...
Position of least significant bit that is set
... efficient way to determine the position of the least significant bit that is set in an integer, e.g. for 0x0FF0 it would be 4.
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Android Archive Library (aar) vs standard jar
... your app.
AARs vs Jars:
The main difference between a Jar and a AAR is that AARs include
resources such as layouts, drawables etc. This makes it a lot easier
to create self-contained visual components. For example if you have
multiple apps that use the same login screen, with Jars you c...