While you will not get an invalid state by changing arrays as you mention, you will have the same problem that happens when two threads are viewing a non volatile integer without synchronization (see the section in the Java Tutorial on Memory Consistency Errors). Basically, the problem is that Thread 1 may write a value … Read more
There exists a solution, which involves dynamic programming, that runs in O(n*TotalSum), where n is the number of elements in the array and TotalSum is their total sum. The first part consists in calculating the set of all numbers that can be created by adding elements to the array. For an array of size n, … Read more
var newArray = []; var a=[“a”,”b”,”c”]; for(var i=0;i<a.length;i++) if(a[i]!==”a”) newArray.push(a[i]); As of newer versions of JavaScript: var a = [“a”,”b”,”c”]; var newArray = a.filter(e => e !== “a”);
You try to instantiate an object of the Friends class like this: Friends f = new Friends(friendsName, friendsAge); The class does not have a constructor that takes parameters. You should either add the constructor, or create the object using the constructor that does exist and then use the set-methods. For example, instead of the above: … Read more
You may have a NAN, INF, or NINF floating around somewhere. Try this: np.isfinite(diff_images).all() np.isfinite(b_0).all() If one or both of those returns False, that’s likely the cause of the runtime error.
(It is probably a bit late for the OP, but it might still be useful for others) Unfortunately Java does not support arrays with more than 231−1 elements. The maximum consumption is 2 GiB of space for a byte[] array, or 16 GiB of space for a long[] array. While it is probably not applicable … Read more
The best resource is straight from the official API: The size, isEmpty, get, set, iterator, and listIterator operations run in constant time. The add operation runs in amortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared … Read more
This is a GCC extension to the standard: You can use the -pedantic option to cause GCC to issue a warning, or -std=c++98 to make in an error, when you use one of these extensions (in case portability is a concern).
The current std::vector doesn’t provide any capability or interface to take ownership of previously allocated storage. Presumably it would be too easy to pass a stack address in by accident, allowing more problems than it solved. If you want to avoid copying into a vector, you’ll either need to use vectors through your entire call … Read more
While not available in C++03, C++11 introduces extended initializer lists. You can indeed do it if using a compiler compliant with the C++11 standard. struct Test { Test() : set { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 } { }; int set[10]; }; The above code compiles fine using g++ -std=c++0x … Read more