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Converting RGB to grayscale/intensity
...ixel
unsigned int fourBytes;
unsigned char r,g,b;
for (int index=0;index<width*height;index++)
{
fourBytes=pntrBWImage[index];//caches 4 bytes at a time
r=(fourBytes>>16);
g=(fourBytes>>8);
b=fourBytes;
...
Find objects between two dates MongoDB
...
Querying for a Date Range (Specific Month or Day) in the MongoDB Cookbook has a very good explanation on the matter, but below is something I tried out myself and it seems to work.
items.save({
name: "example",
creat...
What is the Simplest Way to Reverse an ArrayList?
...n't need to be updated with each iteration. It is initialized to the last index of the ArrayList and is used to access the last element. Inside the for loop the last element is removed and inserted into index i; i is incremented until it reaches the next to last position in the ArrayList.
...
How do I pass multiple parameters in Objective-C?
...For example, if you are adding an object to an NSMutableArray at a certain index, you would do it using the method:
- (void)insertObject:(id)anObject atIndex:(NSUInteger)index;
This method is called insertObject:atIndex: and it is clear that an object is being inserted at a specified index.
In p...
How do I adb pull ALL files of a folder present in SD Card
...r -d '\015' - explained here: http://stackoverflow.com/questions/9664086/bash-is-removing-commands-in-while
while read line; - while loop to read input of previous commands
do adb pull "$line"; done; - pull the files into the current running directory, fin...
Select something that has more/less than x character
...). In Oracle, and probably in all other RDBMSs, this means that a regular index on EmployeeName will be useless to answer this query; the database will do a full table scan, which can be really costly.
However, various databases offer a function indexes feature that is designed to speed up queries...
NSInvocation for Dummies?
... any arguments for that method:
[myInvocation setArgument:&myString atIndex:2];
Note that object arguments must be passed by pointer. Thank you to Ryan McCuaig for pointing that out, and please see Apple's documentation for more details.
At this point, myInvocation is a complete object, desc...
How can I read command line parameters from an R script?
...arg3
If your args are strings with spaces in them, enclose within double quotes.
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How to create file execute mode permissions in Git on Windows?
...n mark it as executable before committing:
C:\Temp\TestRepo>git update-index --chmod=+x foo.sh
C:\Temp\TestRepo>git ls-files --stage
100755 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 foo.sh
And now the file is mode 0755 (executable).
C:\Temp\TestRepo>git commit -m"Executable!"
[m...