for(i in 1:length(pattern)){ country[i] = str_extract(text, pattern[i]) } 这给出了一个长度正确的向量,但用NA填充。 如果您对如何迭代这样的str_extract()调用有任何想法,我们将不胜感激! 您可以删除NA值。FOr示例使用map library(purrr) library(stringr) text |> map(function(t) map_chr(patt...
To model this menopausal depression, we induced a menopause-like state in rats via ovariectomy and exposed them to chronic unpredictable mild stress (CUMS) for 6?weeks, which promotes the development of depression-like symptoms. During the final 4?weeks of CUMS, rats were treated with either ...
Cardio protective effect of nelumbo nucifera flower extract against isoproterenol induced oxidative stress in male swiss albino ratsKirithika.TGomathiR and Usha
Extract matching patterns from a string.