Get indices in a vector that are 0

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August undefined, 2024

WebMay 20, 2024 · I have a Matrix of values and an array of indices and I would like to go through each row of the matrix and only take the value corresponding to the index in my indices array. So for row 1 in matrix, I take the value corresponding to the first element in my array. Mat = [ [0. 4. 4. 4.] [2. 8. WebDec 15, 2013 · It does not mean that the type of the vector is being "stored" in element 0. You would have gotten the same result if you had typed, for example, arr [arr > 30]. No element meets that condition, so the result vector …

how to find the indices of the numbers in an vector …

WebMar 10, 2024 · genindex.cpp. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software ... WebSep 22, 2012 · With a byte array that is mostly zero, being a sparse array, you can take advantage of a 32 bit CPU by doing comparisons 4 bytes at a time. The actual comparisons are done 4 bytes at a time however if any of the bytes are non-zero then you have to determine which of the bytes in the unsigned long are non-zero so that will take more effort. contables indeed

Find indices of elements equal to zero in a NumPy array

WebMar 23, 2024 · 1. Although correct and intuitive, using this paradigm inside a for-loop iterator is notorious for difficult to understand errors in the situation where the length of a (missing or misspelled) vector is 0. Instead of returning a missing value, it returns c (1,0). – IRTFM. Mar 23, 2024 at 20:58. WebI am looking for a condition which will return the index of a vector satisfying a condition. For example- I have a vector b = c (0.1, 0.2, 0.7, 0.9) I want to know the first index of b for which say b >0.65. In this case the answer should be 3 I tried which.min (subset (b, b > 0.65)) But this gives me 1 instead of 3. Please help r Share WebNov 10, 2024 · So, I give you two possible solutions. 1) Without OpenCV. First, you must know that. std::vector::iterator nn = find (index.begin (), index.end (), 255); Will only give you the first occurrance. Knowing this, here is a way you could check if the label is inside the _classes vector. edwin d hill ibew

How to get indices of a Mat with specific value? - Stack Overflow

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WebMay 17, 2024 · Method 1: Using for loop. A for loop iteration can be performed over the rows and columns to access the cell values contained in a matrix. Every element is checked for non-zero value, and if satisfies the constraint, the corresponding cell indices are displayed. The time complexity required is equivalent to O (n * m), where n is the number of ... WebApr 27, 2024 · Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: . Switzerland (English) edwin dewald obituaryWebYes, we can find the index of an element in a vector as follows: > a <- c (3, 2, -7, -3, 5, 2) > b <- (a==-7) # this will output a TRUE/FALSE vector > c <- which (a==-7) # this will give you numerical value > a [1] 3 2 -7 -3 5 2 > b [1] FALSE FALSE TRUE FALSE FALSE FALSE > c … edw in dialysis

"WebJan 2, 2011 · There is np.argwhere, import numpy as np arr = np.array ( [ [1,2,3], [0, 1, 0], [7, 0, 2]]) np.argwhere (arr == 0) which returns all found indices as rows: array ( [ [1, 0], … " - Get indices in a vector that are 0

Get indices in a vector that are 0

How to get indices of a sorted array in Python - Stack Overflow

WebDec 29, 2024 · If 3 is a value then B(5) > 3 so either 5 or B(5)=4 could make sense as a higher value than 3. But this is not the same decision as for the A 4 case: If you are looking for the first element in the vector that is greater than the given value, then for A you would expect to return the information corresponding to the value 5. WebFeb 25, 2014 · If I have a row vector,what command allows me to find the indexes that exceed a certain value that I want as a threshold. For example: A =. Theme. Copy. …

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WebJun 8, 2024 · Video. which () function in R Language is used to return the indices of the object which return true for the logical operation passed as argument. Syntax: which (x, arr.ind) Parameters: x: logical object. arr.ind: Boolean value to display indices. Example 1: x <- matrix (1:9, 3, 3) x. http://matlab.cheme.cmu.edu/2011/08/24/indexing-vectors-and-arrays-in-matlab/

WebMar 28, 2024 · For floating point tensors, I use this to get the index of the element in the tensor.. print((torch.abs((torch.max(your_tensor).item()-your_tensor))<0.0001).nonzero()) Here I want to get the index of max_value in the float tensor, you can also put your value like this to get the index of any elements in tensor. WebJul 12, 2024 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams

WebDec 5, 2012 · import numpy as np # Create your array a = np.arange (1, 10) # a = array ( [1, 2, 3, 4, 5, 6, 7, 8, 9]) # Get the indexes/indices of elements greater than 4 idx = np.where (a > 4) [0] # idx = array ( [4, 5, 6, 7, 8]) # Get the elements of the array that are greater than 4 elts = a [a > 4] # elts = array ( [5, 6, 7, 8, 9]) # Convert idx (or elts) … WebA common use for nonzero is to find the indices of an array, where a condition is True. Given an array a, the condition a > 3 is a boolean array and since False is interpreted as …

WebDec 2, 2024 · Practice. Video. Given an array arr [], the task is to print the indices that have the highest probability of holding the entire sum of the array after performing the given operations: Choose any two elements say arr [i] and arr [j], store their sum in a variable K. Assign K at index of max (arr [i], arr [j]) and assign 0 at index of min (arr ...

WebJul 4, 2024 · If you want to find the indices of all the non-zero elements present in the 3-dimensional array you can use [row,col,v] = find (X) where X is our array. This will find all indices of all non-zero elements present in the array and store them into the vector v . Example: Matlab % MATLAB code for find the indices of con tableclothWebUse the find function to get the index of the element equal to 8 that satisfies the conditions. find (A<9 & ~mod (A,2) & A~=2) ans = 14 The result indicates that A (14) = 8. Replace Values That Meet a Condition Sometimes it is useful to simultaneously change the values of several existing array elements. contabot onineWebConvert Logical into Sequential Index Vector. Learn more about matlab, vector, double, indexing MATLAB. Hello, I am looking for a simple way to convert a logical vector in a sequential vector of doubles whose values are the indices of true in the logical vector. For example, let's say x is a 1x8 l... contabo gutscheinWebyou can get the sorted list and indicies by using zip: sorted_items, sorted_inds = zip (*sorted ( [ (i,e) for i,e in enumerate (my_list)], key=itemgetter (1))) – Charles L. Nov 30, 2015 at 2:58 2 @RomanBodnarchuk this doesn't work, x = [3,1,2]; numpy.argsort (x) yields [1,2,0]. – shahar_m May 14, 2024 at 8:50 c on table of elementsWebJun 9, 2011 · A solution using list.index: def indices (lst, element): result = [] offset = -1 while True: try: offset = lst.index (element, offset+1) except ValueError: return result result.append (offset) It's much faster than the list comprehension with enumerate, for … edwin d hill edwin diaz birth dateWebThe indices can be used as an index into an array. >>> x = np.arange(20).reshape(5, 4) >>> row, col = np.indices( (2, 3)) >>> x[row, col] array ( [ [0, 1, 2], [4, 5, 6]]) Note that it … edwin devera michigan