Topics in constrained and unconstrained ordination
نویسندگان
چکیده
منابع مشابه
Constrained Ordination: Tutorial with R and vegan
Constrained ordination methods include constrained (or canonical) correspondence analysis (CCA), redundancy analysis (RDA) and distancebased redundancy analysis (db-RDA). Constraining means that ordination only shows the community variation that can be explained by external environmental variables or constraints. This document describes the following basic concepts (1) usage of constrained ordi...
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Canonical correspondence analysis (CCA) is perhaps the most popular multivariate technique used by environmental ecologists for constrained ordination; it is an approximation to the maximum likelihood solution of the Gaussian response model. In this article, we look at the constrained ordination problem from a slightly different point of view and argue that it is this particular point of view t...
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We develop methods for analyzing and constructing combined modulation/error-correctiong codes (ECC codes), in particular codes that employ some form of reversed concatenation and whose ECC decoding scheme requires easy access to soft information (e.g., turbo codes, low-density parity-check (LDPC) codes or parity codes). We expand on earlier work of Immink and Wijngaarden and also of Fan, in whi...
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First, we study the Unconstrained Fault-Tolerant Resource Allocation (UFTRA) problem (a.k.a. FTFA problem in [19]). In the problem, we are given a set of sites equipped with an unconstrained number of facilities as resources, and a set of clients with setR as corresponding connection requirements, where every facility belonging to the same site has an identical opening (operating) cost and ever...
متن کاملInterval Analysis: Unconstrained and Constrained Optimization
INTERVAL ANALYSIS: UNCON-STRAINED AND CONSTRAINED OPTIMIZATION Introduction. Interval algorithms for constrained and un-constrained optimization are based on adaptive, exhaustive search of the domain. Their overall structure is virtually identical to Lipschitz optimization as in [4], since interval evaluations of an objective function φ over an interval vector x correspond to estimation of the ...
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ژورنال
عنوان ژورنال: Plant Ecology
سال: 2014
ISSN: 1385-0237,1573-5052
DOI: 10.1007/s11258-014-0356-5