r语言str_sub函数r语言str函数用法 字符串操作一般分割、拼接、替换、提取等等拆分strsplitstrsplit默认输出格式为列表strsplit(x, split, fixed = FALSE, perl = FALSE, useBytes = FALSE)x:字符串向量,向量中的每个字符串元素都会被分割split:位置的字串向量,即在哪个字串处开始拆分;该参数默认是正则表达式匹配...
R语言是基于S语言的一种开源实现。S语言是贝尔实验室最早开发的一种用于统计的工具,后来成为商业的S-PLUS软件,是一种与SAS和SPSS齐名的统计软件。 R语言的官方网址是:[https://www.r-project.org/] R语言的一个重要的优势就是R的生态,有大量的高质量的第三方的统计和算法相关的包。 在R中活下去 获取帮助 ...
lytical potential energy function of PO 2 (X 2 A 1 ). To emphasize it, we also depict the contours of the poten- tial energy function of PO 2 (X 2 A 1 ). In order to ex- amine whether the present calculations improve over the previous results and give the direction for the ex-...
Ba/F3 cells expressing STRN3::PDGFRB or ETV6::PDGFRB were sensitive to tyrosine kinase inhibitors (TKIs) and selinexor, but in vitro experiments showed that the combination of imatinib and selinexor had a marked synergistic effect, although only the imatinib alone group could prolong the survival ...
C. E. Zah et al., " High-Temperture Modulation Dynamics of 1.3 mum AlxGay Inl-x-yAs/InP Compressive-Strained Multiple-Quantum-Well Lasers ", 14th International Semiconductor Laser Conference (1994), TH 1.3, pp. 215-216.C. E. Zah, M. C. Wang, R. Bhat...