Understanding NumPy's nonzero function - Stack Overflow
2011年10月28日 · The first element of the tuple is the first index for each of the nonzero values: ([0, 1, 1]), and the second element of the tuple is the second index for each of the nonzero values: ([0, 0, 1]). Your second code block just returns the nonzero values of the array (I am not clear from the question if the return value is part of the confusion).
terminology - Question: What does "nonzero" polynomial mean ...
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Find indices of elements equal to zero in a NumPy array
2011年1月3日 · NumPy has the efficient function/method nonzero() to identify the indices of non-zero elements in an ndarray object. What is the most efficient way to obtain the indices of the elements that do hav...
Math terminology: What are rules regarding hyphens? (Nonzero …
As a personal preference, I like the way nonzero looks but I prefer to use non-empty so I don't know what the consistency with hyphens is when prefixing "non". I also like the way nonnegative reads but I feel like non-positive looks better than without a hyphen. I don't have any rhyme or reason why I have these preferences and that's why I'm ...
How do I get a list of indices of non zero elements in a list?
Time comparison of the two answers w.r.t length of the list. a = [int(random.random()>0.5) for i in range(10)] %timeit [i for i, e in enumerate(a) if e != 0] 683 ns ± 14 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each) %timeit np.nonzero(a)[0] 4.43 µs ± 102 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each) a = [int(random.random()>0.5) for i in range(1000)] %timeit ...
In TensorFlow, how can I get nonzero values and their indices …
2016年8月30日 · And I want to get nonzero values and their indices from it. Nonzero values: [1,4] Nonzero indices: [[0,0],[1,1]] There are similar operations in Numpy. np.flatnonzero(A) return indices that are non-zero in the flattened A. x.ravel()[np.flatnonzero(x)] extract elements according to non-zero indices. Here's a link for these operations.
python - Difference between nonzero (a), where (a) and argwhere …
2013年4月12日 · In Numpy, nonzero(a), where(a) and argwhere(a), with a being a numpy array, all seem to return the non-zero indices of the array. What are the differences between these three calls? On argwhere the documentation says: np.argwhere(a) is the same as np.transpose(np.nonzero(a)). Why have a whole function that just …
numpy - Python Pandas find non zero indices - Stack Overflow
2013年5月26日 · numpy.nonzero(df) produces an array of all the non-zero values but I'm not sure how to feed that value into an all() function. My question is what would be the best and quickest way of removing those index rows and columns from a DataFrame that are all empty (or all have a value such as N/A)s. Thanks. EDIT example of the source spreadsheet added
Difference between cv2.findNonZero and Numpy.NonZero
2016年10月12日 · Silly question here. I want to find the locations of the pixels from some black and white images and found this two functions from Numpy library and OpenCV. The example I found on the internet (h...
OpenCV: Find all non-zero coordinates of a binary Mat image
2013年10月8日 · There is the following source code that was supplied for OpenCV 2.4.3, which may be helpful:. #include <opencv2/core/core.hpp> #include <vector> /*! @brief find non-zero elements in a Matrix * * Given a binary matrix (likely returned from a comparison * operation such as compare(), >, ==, etc, return all of * the non-zero indices as a std::vector<cv::Point> (x,y) * * This function aims to ...