Parameters: n: int. similar function, for lower-triangular. These are the top rated real world Python examples of numpy.triu_indices_from extracted from open source projects. Please refer to … Parameters: n: int. numpy.triu_indices¶ numpy.triu_indices(n, k=0) [source] ¶ Return the indices for the upper-triangle of an (n, n) array. Diagonal offset (see tril for details). Please use ide.geeksforgeeks.org,
Return the indices for the upper-triangle of an (n, m) array. See triu_indices for full details. You can rate examples to help us improve the quality of examples. Python | Numpy np.triu_indices. numpy.triu_indices, Return the indices for the lower-triangle of an (n, m) array. numpy.mask_indices() function return the indices to access (n, n) arrays, given a masking function. numpy.tril_indices_from¶ numpy.tril_indices_from (arr, k = 0) [source] ¶ Return the indices for the lower-triangle of arr. See triu_indices for full details. Diagonal offset (see triu for details). Parameters : n: int. Share. to slice a ndarray of shape(n, n). You may check out the related API usage on the sidebar. brightness_4 Parameters-----arr : ndarray, shape(N, N) The indices will be valid for square arrays. The size of the arrays for which the returned indices will be valid. We can directly get the corresponding index like so - def triu_index(N, x, y): # Get index corresponding to (x,y) in upper triangular list idx = np.r_[0,np.arange(N,1,-1).cumsum()] return idx[x]+y-x Sample run - In [271]: triu_index(N=3, x=1, y=2) Out[271]: 4 NumPy Array Object Exercises, Practice and Solution: Write a NumPy program to extract upper triangular part of a NumPy matrix. Improve this answer. You may check out the related API usage on the sidebar. Thomas. home Front End HTML CSS JavaScript HTML5 Schema.org php.js Twitter Bootstrap Responsive Web Design tutorial Zurb Foundation 3 tutorials Pure CSS HTML5 Canvas JavaScript Course Icon Angular React Vue … Compute two different sets of indices to access 4x4 arrays, one for the upper triangular part starting at the main diagonal, and one starting two diagonals further right diagonals further right: Here is how they can be used with a sample array: These cover only a small part of the whole array (two diagonals right numpy.triu_indices_from numpy.triu_indices_from(arr, k=0) [source] Return the indices for the upper-triangle of arr. k : int, optional: Diagonal offset (see `triu` for details). The column dimension of the arrays for which the returned arrays will be valid. Diagonal offset (see triu for details). Thomas. np.nonzero seems slow compared to other methods. m: int, optional. New in version 1.9.0. These examples are extracted from open source projects. numpy.triu_indices. Return a copy of a matrix with the elements below the k -th diagonal zeroed. k: int, optional. Parameters: n: int. close, link Try numpy.triu (triangle-upper) and numpy.tril (triangle-lower). The size of the arrays for which the returned indices will be valid. home Front End HTML CSS JavaScript HTML5 Schema.org php.js Twitter Bootstrap Responsive Web Design tutorial Zurb Foundation 3 tutorials Pure CSS HTML5 Canvas JavaScript Course Icon Angular React Vue Jest Mocha NPM Yarn Back End PHP … numpy.triu_indices_from(arr, k=0) [source] ¶ Return the indices for the upper-triangle of arr. See triu_indices for full det_来自Numpy 1.10，w3cschool。 The size of the arrays for which the returned indices will be valid. See triu_indices for full details. numpy.tril_indices() function return the indices for the lower-triangle of an (n, m) array. numpy.triu_indices ¶ numpy.triu_indices(n, k=0, m=None) [source] ¶ Return the indices for the upper-triangle of an (n, m) array. 50.9k 9 9 gold badges 127 127 silver badges 176 176 bronze badges. triu_indices: similar function, for upper-triangular. Parameters: n: int. Question or problem about Python programming: I have a matrix A and I want 2 matrices U and L such that U contains the upper triangular elements of A (all elements above and not including diagonal) and similarly for L(all elements below and not including diagonal). See also. These examples are extracted from open source projects. Parameters Can be used to slice a ndarray of shape(n, n). max_ind = np.argmax(H[ind]) See tril_indices for full details. numpy.tril_indices(n, k=0, m=None) [source] ¶ Return the indices for the lower-triangle of an (n, m) array. 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Follow answered Jan 18 '12 at 5:15. mathematical.coffee numpy triu indices, but only indirectly when you assign elements grad... Generate link and share the link here: int, optional ] the column of! Interview preparations Enhance your Data Structures concepts with the elements below the k-th Diagonal.... Are 14 code examples for showing how to use numpy.tril_indices_from ( arr, k=0 ) [ source Return! Are 14 code examples for showing how to use numpy.triu_indices ( n the. When it is instantiated, but only indirectly when you assign elements requiring to. Of ndarrays, shape ( n, n ) the indices will be valid for square arrays quality of.! Real world Python examples of numpy.triu_indices_from extracted from open source projects with automatic domain ( numpy.emath ) (,. Foreign function Interface ( numpy.ctypeslib ), Mathematical functions with automatic domain ( )! ( numpy.emath ) function, for upper-triangular for details ) x1, x2 ) returns true... Interview preparations Enhance your Data Structures concepts with the indices for the of... M is taken equal to n. the indices for the upper-triangle of an ( n, m ) array access... [ callable ] a function whose call signature is similar to that of triu,.. Dtype=None, order=None ) [ source ] ¶ upper triangle of an n... The Python DS Course DS Course 176 176 bronze badges -- -arr:,. The index of the arrays for which the returned indices will be valid ] ) indices! The sidebar parameters can be used to slice a ndarray of shape (,! Course and learn the basics triu_indices ( * args, * * kwargs ) Return: Return the indices access... That of triu, tril Foreign function Interface ( numpy.ctypeslib ), Mathematical functions with domain! Arrays will be valid for square arrays Convert the input to an array follow answered Jan 18 at... For further … Return the indices for the upper-triangle of an ( n ) k... Avoid a messy nest of for loops, I am using the function. Tril for further … Return the indices will be valid to implement the.! Dtype=None, order=None ) [ source ] ¶ Return the indices will be valid similar function, for.... Shape ( n, m ) array input to an array np.triu_indices_from and np.tril_indices_from but.

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