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jk3d
- jk3d is a java code for 3d interpolation of scattered data. jk3d uses a quality weighted ordinary Kriging method and optional an inverse distances weighting method. It has no graphical user interface and uses ASCII files to define the input.
IDF
- IDF反映了在文档集合中一个单词对一个文档的重要性,经常在文本数据挖据与信息提取中用来作为权重因子。在一份给定的文件里,词频(termfrequency-TF)指的是某一个给定的词语在该文件中出现的频率。逆向文件频率(inversedocument frequency,IDF)是一个词语普遍重要性的度量。-IDF reflects the importance of a word in a document collection for a document, often in the text
TF
- TF-IDF是一种统计方法,用以评估一字词对于一个文件集或一个语料库中的其中一份文件的重要程度。字词的重要性随着它在文件中出现的次数成正比增加,但同时会随着它在语料库中出现的频率成反比下降。TF-IDF加权的各种形式常被搜索引擎应用,作为文件与用户查询之间相关程度的度量或评级- TF-IDF is a statistical method to assess the importance of a word for a file set or a corpus of the importan