I need to extract 4 different random numbers from an array, excluding some index values. For example, in the code bellow I need to exclude 2 and 3. Well, no problem, I create a lookup table containing only with the values I need, then ‘random_number’ +1, + 2, + 5… will give me the other ..
Category : indexing
I was wondering if it is possible to implement a custom index as a postgres extension? I tried to find an answer via Google, but was not very successful (mainly because of the ambiguity of the search query). Maybe someone has already implemented a custom index and can point me to some literature or code. ..
I need to generate some numbers and use that list as a validation for the user input. Luckily, I figured it out how to get the correct numbers in the correct sequence but I’m struggling to pass this list into an array. (or something else) for (int e = 1; e <= max_event_number; e++) { ..
I am trying to scale an image up or down by a real-valued factor using nearest pixel sampling. However, I have met with an unexpected index out of range when I compile it. Can anyone help me check my code related to this issue? Image32 Image32::scaleNearest( double scaleFactor ) const { Image32 Image = Image32(); ..
I need to overwrite values in a 2D vector, where the new values is simply just equal to an integer I am counting up. But as soon as I exit this if-statement, the value resets to the original value? I think it may have something to do with the indexing, but I just can’t figure ..
I have a vector of 10 doubles and I need to find the four lowest values of the 10 while still keeping the index of the lowest values (so I can keep track of them later). In this case I can assume that all 10 values are unique. I tried creating a loop to do ..
Say I had the following: //typedef Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::ColMajor> CMatrix; //typedef Eigen::Array<bool, 1, Eigen::Dynamic> BoolVector; CMatrix X0 = CMatrix::Random(5, 3); BoolVector missing = BoolVector::Constant(3, true); missing[1] = false; CMatrix X1 = X0(Eigen::all, !(missing)); std::cout << "X0 =n" << X0 << std::endl; std::cout << "X1 =n" << X1 << std::endl; Basically, I would like to ..
https://youtu.be/IkvSkoW3sS8?list=PLmxqg54iaXrjhvQy_GbzYdvURV4sKs0CT&t=316 Following this tutorial the teacher prints the value of the -1 index -> 33, 6 elements x 4 bytes gives 24bytes, which is a multiple of 8, why does it reserve 32 bytes?, I cannot find information on the internet for this subject: "index -1 in a dynamically allocated array". Source: Windows Que..
I’m trying to iterate through an array (vector) and replace the value "num" with the appropriate vector index. For instance, if the number is 2, the for loop should iterate over until it matches the index of the vector std::vector<int> uniqueNumsLength(uniqueNumbers);, and finally it increments the appropriate index: uniqueNumsLength[num]++;. The problem I’m having is that ..
I am familiar with python’s indexing system but not with C++’s… so please help me I want to index an array negatively… I have tried int myarray[5] = {1,2,3,4,5}; cout << myarray[-1]; but it is generating some number very big which is not a part of this array… Source: Windows Que..
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