本文原创,转载请注明出处,本人Q1273314690(交流学习) 总结: 就是MARGIN决定了你的FUN调用几次,每次传递给你的是什么维度的内容,而...是传递给FUN的(每次调用的时候都会被传递给FUN).apply的返回值结果可能是向量,数组(含矩阵)或列表(具体要根据条件分类讨论,但实际上我们没有必要,直接看一下返回的结果就知道是什么类型了)   apply {base} Description Returns a vector or array or list of values…

1cs3157 – Advanced ProgrammingSummer 2014, Project 1, 150 pointsJune 17, 2014Follow these step-by-step instructions. This homework must be submitted electronically bySunday night July 6th, 11pm. Please start early, so we can help if you get stuck.In…

1cs3157 – Advanced ProgrammingSummer 2014, Project 1, 150 pointsJune 17, 2014Follow these step-by-step instructions. This homework must be submitted electronically bySunday night July 6th, 11pm. Please start early, so we can help if you get stuck.In…

这个包让你可以更快地完成数据集的数据处理工作.放弃选取行或列子集的传统方法,用这个包进行数据处理.用最少的代码,你可以做最多的事.相比使用data.frame,data.table可以帮助你减少运算时间.一个数据表格包含三部分,即DT[i, j, by].你可以理解为我们告诉R用i来选出行的子集,并计算通过by来分组的j.大多数时候,by是用于类别变量的. 特点 data.table(DT)的操作语句类似于SQL,DT[i, j, by]中的i, j, by 对应着SQL语句的 i=where,…

如果你用过linux,你可能知道在linux下面的有一个强大的calendar功能,即日历 在python中,同样也有这样的一个强大的calendar 下面是我做的demo: #python中的calendar import calendar #返回指定年的某月 def get_month(year, month): return calendar.month(year, month) #返回指定年的日历 def get_calendar(year): return calendar.calen…

affrike 英文单词,含义是非洲,非洲大陆. 中文名:非洲 外文名:affrike 目录 释义 affrike noun名词 非洲,也用做africa 1.Word Origin and History for africa,English word was Affrike. [1] 2.Affrike, p.337 - (Africa) "Whenever Chaucer mentions Africa, he is refering to the northern coast of th…

affrike 英文单词,含义是非洲,非洲大陆. 中文名:非洲 外文名:affrike 目录 释义 affrike noun名词 非洲,也用做africa 1.Word Origin and History for africa,English word was Affrike. [1] 2.Affrike, p.337 - (Africa) "Whenever Chaucer mentions Africa, he is refering to the northern coast of th…

``` DATA LV_MONTH TYPE FCKTX. CLEAR:LV_MONTH,lv_date. SELECT SINGLE KTX INTO LV_MONTH FROM T247 WHERE SPRAS EQ SY-LANGU AND MNR EQ gs_header-print_date+4(2). IF sy-subrc eq 0. CONCATENATE gs_header-print_date+6(2) lv_month gs_header-print_date+0(4) I…

For a better environment, we should teach our children to put litter/garbage/trash into dustbin/dust pan. When he decided to study hard, his life had an abrupt change. He came to see me abruptly. Once she encounters danger, she'll show her mettle. I…

Season 1, Episode 5: English, Fitz or Percy -Pope: I assume this is about your transfer request for Michael Scofield. transfer: 转移 request: 请求  assume: 认为想当然的认为 我想你们是为Michael Scofield的转移申请来的 -Kellerman: More specifically, why you denied it specifical…