How do I print unique elements in Perl array?
use List::MoreUtils qw/ uniq /; my @unique = uniq @faculty; foreach ( @unique ) { print $_, “\n”; }
unique
Checking if all elements of a vector are equal in C++
You need not to use std::sort. It can be done in a simpler way: if ( std::adjacent_find( myvector.begin(), myvector.end(), std::not_equal_to<>() ) == myvector.end() ) { std::cout << “All elements are equal each other” << std::endl; }
Unique hardware ID in Mac OS X
For C/C++: #include <IOKit/IOKitLib.h> void get_platform_uuid(char * buf, int bufSize) { io_registry_entry_t ioRegistryRoot = IORegistryEntryFromPath(kIOMasterPortDefault, “IOService:/”); CFStringRef uuidCf = (CFStringRef) IORegistryEntryCreateCFProperty(ioRegistryRoot, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0); IOObjectRelease(ioRegistryRoot); CFStringGetCString(uuidCf, buf, bufSize, kCFStringEncodingMacRoman); CFRelease(uuidCf); }
Get count of each unique value in one column of a 2d array
Use array_key_exists & increment the count, $newArray = array(); foreach ($the_outer_array as $key=>$value) { $firstValue = $value[0]; if ($foundKey = array_key_exists($firstValue,$newArray)) { $newArray[$firstValue] += 1; } else{ $newArray[$firstValue] = 1; } } DEMO.
How to merge subarray values and remove duplicates?
If you really don’t want to loop, try this: $arr[] = array(‘A’,’B’); $arr[] = array(‘C’,’B’); $arr[] = array(‘C’,’D’); $arr[] = array(‘F’,’A’); $merged = array_unique(call_user_func_array(‘array_merge’, $arr));
Counting unique elements in a list
Using Data.Map and tuple sections: count = Map.fromListWith (+) . map (, 1) (Add Map.toList if you need a list.)
How to eliminate the extra minus sign when rounding negative numbers towards zero in numpy?
The issue you’re having between -0. and +0. is part of the specification of how floats are supposed to behave (IEEE754). In some circumstance, one needs this distinction. See, for example, the docs that are linked to in the docs for around. It’s also worth noting that the two zeros should compare to equal, so … Read more
Map/Set to maintain unique array of arrays, Javascript
One way would be to convert the arrays to JSON strings, then use a Set to get unique values, and convert back again var arr = [ [1, 1, 2], [1, 2, 1], [1, 1, 2], [1, 2, 1], [2, 1, 1], [2, 1, 1] ]; let set = new Set(arr.map(JSON.stringify)); let arr2 = Array.from(set).map(JSON.parse); … Read more
SQL Server – How to insert a record and make sure it is unique
Your solution: INSERT INTO Words (Word) SELECT @Word WHERE NOT EXISTS (SELECT WordID FROM Words WHERE Word = @Word) …is about as good as it gets. You could simplify it to this: INSERT INTO Words (Word) SELECT @Word WHERE NOT EXISTS (SELECT * FROM Words WHERE Word = @Word) …because EXISTS doesn’t actually need to … Read more