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Michael Lawrence Hadley Wickham Dianne Cook Heike Hofmann Deborah F. Swayne 《Computational Statistics》2009,24(2):195-205
This paper describes progress towards developing a platform for rapid prototyping of interactive data visualizations, using
R, GGobi, rggobi and RGtk2. GGobi is a software tool for multivariate interactive graphics. At the core of GGobi is a data
pipeline that incrementally transforms data through a series of stages into a plot and maps user interaction with the plot
back to the data. The GGobi pipeline is extensible and mutable at runtime. The rggobi package, an interface from the R language
to GGobi, has been augmented with a low-level interface that supports the customization of interactive data visualizations
through the extension and manipulation of the GGobi pipeline. The large size of the GGobi API has motivated the use of the
RGtk2 code generation system to create the low-level interface between R and GGobi. The software is demonstrated through an
application to interactive network visualization. 相似文献
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Heike Mildenberger 《Archive for Mathematical Logic》2001,40(2):93-112
We show that the Filter Dichotomy Principle implies that there are exactly four classes of ideals in the set of increasing
functions from the natural numbers. We thus answer two open questions on consequences of ? < ?. We show that ? < ? implies
that ? = ?, and that Filter Dichotomy together with ? < ? implies ? < ?. The technical means is the investigation of groupwise
dense sets, ideals, filters and ultrafilters. With related techniques we prove the new inequality ?≤ cf(?).
Received: 9 October 1998 / Revised version: 18 August 1999 / Published online: 21 December 2000 相似文献
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Zeitschrift für Physik A Hadrons and nuclei - Wie in der Atomhülle, so kann man auch beim Atomkern eine Reihe qualitativer Eigenschaften der ZustÄnde aus Betrachtung der... 相似文献
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Maurício Hilgemann Fritz Scholz Heike Kahlert Leandro Machado de Carvalho Marcelo Barcellos da Rosa Ulrike Lindequist Martina Wurster Paulo C. do Nascimento Denise Bohrer 《Electroanalysis》2010,22(4):406-412
A new electrochemical assay has been developed which is based on quantifying the attack of OH. radicals on a self‐assembled thiol monolayer on electrodes in the presence and absence of antioxidants. The OH. radicals were produced in Fenton solutions. The radical scavengers diminish the concentration of the OH. radicals in the Fenton solution, and the extent of thiol layer destruction is monitored with the help of a redox probe in solution, the signal of which is only generated at SAM‐free electrode surface. The results of the electrochemical assay were compared with those of the standard DPPH. assay. In case of each plant extract, an excellent linear correlation was observed between the radical scavenging activity and the concentration of plant extracts; however, the scavenging properties of different plants strongly differ in the electrochemical and the DPPH. assay. Since the proposed new method probes the reactivity of radical scavengers towards OH., one of the most important reactive oxygen radicals in tissues, it is supposed to provide much more relevant information than the DPPH. or other assays. 相似文献