Python – How can I move a nested json dictionary up to its own index? Question: I have a json dataset where each item/index can contain 2 nested dictionaries. The problem is that one of these nested dictionaries contains all of the exact key:value pairs as its parent dictionary. To put it in other words, …
Map the indices of 2d array into 1d array in Python Question: Say I have a square 2d array (mat) and a 1d array (arr) which is the same length as the flattened 2d array (the values inside are different). Given the row and column index of the 2d array, how can I map it …
Index matrix but return a list of lists Pytorch Question: I have a 2-dimensional tensor and I would like to index it so that the result is a list of lists. For example: R = torch.tensor([[1,2,3], [4,5,6]]) mask = torch.tensor([[1,0,0],[1,1,1]], dtype=torch.bool) output = R[mask] This makes output as tensor([1, 4, 5, 6]). However, I would …
Is it possible to iterate over elements in a list and return chunks of the list based on repeating characters? Question: I have data stored in a list that follows a pattern. The data comes from reading a file line by line and appending certain lines to a list. When I print the list, the …
pandas fill a dataframe according to column and row value operations Question: Let’s say that I have this dataframe: ,,,,,, ,,2.0,,,, ,2.0,,2.23606797749979,,, ,,2.23606797749979,,,2.0, ,,,,,2.23606797749979, ,,,2.0,2.23606797749979,, ,,,,,, I would like to get a two dimensional vector with values of the indexes and the columns of each element which is not nan. For example, in this case, …
Python np where , variable as array index, tuple Question: I want to search a value in a 2d array and get the value of the correspondent "pair" in this example i want to search for ‘d’ and get ’14’. I did try with np location with no success and i finished with this crap …
Values in numpy matrix based on an array using index and value of each element Question: I would like to use a numpy array to index a numpy matrix using the values of the array indicating the columns, and indices indicating the corresponding row numbers.As an example, I have a numpy matrix, a = np.tile(np.arange(1920), …
OpenCV Mat cpp operation only on condition Question: Having a hard time figuring out how to do this python operation in c++ without looping. The goal is to perform an operation only on a part of the cv::Mat that meets a condition. In this case, scaling values of the image that were originally between -5 …
How can I make this Indexing algorithm more efficient? Question: I’ve got a Dataframe (deriving from a csv file with various columns) with 172033 rows. I’ve created a custom indexing function that blocks pairs of records that haven’t got similar ‘name’ attributes. The problem resides in the efficiency of the algorithm. Just to get to …
Print full pandas index in Jupyter Notebook Question: I have a pandas index with 380 elements and want to print the full index in Jupyter Notebook. I googled already but everything I’ve found did not help. For example this does not work: with pd.option_context(‘display.max_rows’, None, ‘display.max_columns’, None): print(my_index) Neither this works: with np.printoptions(threshold=np.inf): print(my_index.array) In …
