mapply r
mapply calls FUN for the values of ... (re-cycled to the length of the longest, unless any have length zero), followed by the arguments given in MoreArgs . The arguments in the call will be named if ... or MoreArgs are named. Arguments with classes in ..., The mapply and by are used to apply a function over multiple vectors and list (mapply) or dataframe (by) one index at a time.,mapply is a multivariate version of sapply . mapply applies FUN to the first elements of each … argument, the second elements, the third elements, and so on. Arguments are recycled if necessary. ,Splitting the matrices isn't the biggest contributor to evaluation time. set.seed(21) matrixA <- matrix(rnorm(5 * 9000), nrow = 9000) matrixB <- matrix(rnorm(4 * 9000), nrow = 9000) system.time( scores <- mapply(t.test.stat, split(matrixA, ro,跳到 The mapply() Function - The mapply() function stands for 'multivariate' apply. Its purpose is to be able to vectorize arguments to a function that is not usually accepting vectors as arguments. In short, mapply() applies a Function to Multiple, R中利用apply、tapply、lapply、sapply、mapply、table等函数进行分组统计_菜鸟的成长_新浪博客,菜鸟的成长,,The mapply function in R. Roger Peng. Loading... Unsubscribe from Roger Peng? Cancel Unsubscribe ... , 那么，这是为什么呢？原因在于R的循环操作for和while，都是基于R语言本身来实现的，而向量操作是基于底层的C语言函数实现的，从性能上来看，就会有比较明显的差距了。那么如何使用C的函数来实现向量计算呢，就是要用到apply的家族函数，包括apply, sapply, tapply, mapply, lapply, rapply, vapply, eapply等。
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 mapply r 相關參考資料
mapply
mapply calls FUN for the values of ... (re-cycled to the length of the longest, unless any have length zero), followed by the arguments given in MoreArgs . The arguments in the call will be named if .... http://stat.ethz.ch mapply and by functions in R - StudyTrails
The mapply and by are used to apply a function over multiple vectors and list (mapply) or dataframe (by) one index at a time. http://www.studytrails.com mapply function | R Documentation
mapply is a multivariate version of sapply . mapply applies FUN to the first elements of each … argument, the second elements, the third elements, and so on. Arguments are recycled if necessary. https://www.rdocumentation.org r - Efficient apply or mapply for multiple matrix arguments by row ...
Splitting the matrices isn't the biggest contributor to evaluation time. set.seed(21) matrixA <- matrix(rnorm(5 * 9000), nrow = 9000) matrixB <- matrix(rnorm(4 * 9000), nrow = 9000) system.t... https://stackoverflow.com R tutorial on the Apply family of functions (article) - DataCamp
跳到 The mapply() Function - The mapply() function stands for 'multivariate' apply. Its purpose is to be able to vectorize arguments to a function that is not usually accepting vectors as argum... https://www.datacamp.com R中利用apply、tapply、lapply、sapply、mapply、table等函数进行分组 ...
R中利用apply、tapply、lapply、sapply、mapply、table等函数进行分组统计_菜鸟的成长_新浪博客,菜鸟的成长, http://blog.sina.com.cn The mapply function in R - YouTube
The mapply function in R. Roger Peng. Loading... Unsubscribe from Roger Peng? Cancel Unsubscribe ... https://www.youtube.com 掌握R语言中的apply函数族| 粉丝日志
那么，这是为什么呢？原因在于R的循环操作for和while，都是基于R语言本身来实现的，而向量操作是基于底层的C语言函数实现的，从性能上来看，就会有比较明显的差距了。那么如何使用C的函数来实现向量计算呢，就是要用到apply的家族函数，包括apply, sapply, tapply, mapply, lapply, rapply, vapply, eapply等。 http://blog.fens.me |