Results 1 to 10 of about 45,210 (133)
The Totally Positive Completion Problem: The 3-by-n Case
Special Matrices, 2021 The 3-by-n TP-completable patterns are characterized by identifying the minimal obstructions up to natural symmetries. They are finite in number.
Carter D. +4 more
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Generating Totally Positive Toeplitz Matrix from an Upper Bidiagonal Matrix
Advances in Linear Algebra & Matrix Theory, 2015 In this paper, we construct one of the forms of totally positive Toeplitz matrices from upper or lower bidiagonal totally nonnegative matrix. In addition, some properties related to this matrix involving its factorization are presented.
Mohamed A. Ramadan, Mahmoud M. Abu Murad
exaly +3 more sources
Coherence Matrix Estimation With Total Positivity Regularization for Interferometric Phase Linking
IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingInterferometric phase linking has become a critical step in distributed scatterer interferometry, yet its performance is significantly affected by inaccuracies in the coherence matrix and its inverse, such as the precision matrix.
Changjun Zhao, Yan Yan, Hanwen Yu
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The approximation of a totally positive band matrix by a strictly banded totally positive one
Linear Algebra and Its Applications, 1982 AbstractEvery nonsingular totally positive m-banded matrix is shown to be the product of m totally positive one-banded matrices and, therefore, the limit of strictly m-banded totally positive matrices. This result is then extended to (bi)infinite m-banded totally positive matrices with linearly independent rows and columns.
Carl de Boor, Allan Pinkus
exaly +3 more sources
Covariance Matrix Estimation under Total Positivity for Portfolio Selection [PDF]
Journal of Financial Econometrics, 2020 Abstract Selecting the optimal Markowitz portfolio depends on estimating the covariance matrix of the returns of N assets from T periods of historical data. Problematically, N is typically of the same order as T, which makes the sample covariance matrix estimator perform poorly, both empirically and theoretically.
Agrawal, Raj, Roy, Uma, Uhler, Caroline
openaire +2 more sources
How to Affect the Number of Images on the Success Rate for Detection of Weeds with Deep Learning
Turkish Journal of Agriculture: Food Science and Technology, 2022 The detection of weeds with computer vision without the help of an expert is important for scientific studies and other purposes. The images used for the detection of weeds are recorded under controlled conditions and used in image processing-deep ...
Mustafa Guzel +5 more
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Turkish Journal of Agriculture: Food Science and Technology, 2021 In the present study, totally 49 samples, which showed the symptoms of leaf and shoot blight and cankers with brown discoloration of necrotic tissues on mature branches, were collected from 22 districts and areas of Konya Province between 2017 and 2019 ...
Aysun Öztürk, Kubilay Kurtulus Bastas
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Doubly constrained totally positive line insertion
Special Matrices, 2020 It is shown that in any TP matrix, a line (row or column) with two speci˝ed entries in any positions (and the others appropriately chosen) may be inserted in any position, as long as the two entries are consistent with total positivity.
Johnson Charles R., Allen David W.
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The development and evaluation of psychometric properties of the Economic-Psychological Resilience Scale (EPRS) [PDF]
پژوهشهای علوم شناختی و رفتاری, 2022 The present study aimed to develop the Economic-Psychological Resilience Scale (EPRS) and evaluate its psychometric properties. To this end, a descriptive research method was used.
Somayeh Pourehsan +1 more
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Progressive Iterative Approximation with Preconditioners
Mathematics, 2020 The progressive iterative approximation (PIA) plays an important role in curve and surface fitting. By using the diagonally compensated reduction of the collocation matrix, we propose the preconditioned progressive iterative approximation (PPIA) to ...
Chengzhi Liu, Zhongyun Liu
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