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获取表、时间表或高数组的顶部行

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语法

B=水头（A）

B=水头（A，k）

描述

例子

B= (A.)返回表或时间表的前8行A..

例子

B= (A.,K)返回第一个K行A..

例子

全部崩溃

预览表

打开生活的脚本

创建一个包含100行和五个变量的表。

负载病人T =表(LastName、性别、年龄、身高、体重);大小(T)

ans=1×2100 5

预览前八行。

T2 =头(T)

T2 =8×5表UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别性别身高身高身高体重体重体重。UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU‘女性’3364142{‘威尔逊’}{‘男性’4068180

预览高表的内容

打开生活的脚本

创建一个高表并预览前几行数据。

创建一个高的表airlinesmall.csv数据集。选择要使用的变量子集。使用头提取前几行数据。

变量名={“年”,“月”,“ArrDelay”,“德布雷”,“UniqueCarrier”};ds =数据存储(“airlinesmall.csv”,“治疗减少”,“NA”,...“SelectedVariableNames”, varnames);T =高(ds)

Tt=MXT=MXT=Mx5高台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台月月月月月月延迟延迟延迟延迟延迟延迟延迟延迟，延迟延迟，延迟，延迟，延迟，非非台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台：：：：：：：：

tt=水头（T）

tt = 8 x5高表年月ArrDelay DepDelay UniqueCarrier  ____ _____ ________ ________ _____________ 1987 10 8 1987 10 8 1{“PS”}{“PS”}1987 10 21 1987 10 13 12{“PS”}{“PS”}{“PS”}1987 10 1987 10 59 63{“PS”}1987 3 1987 10 11 1{“PS”}{“PS”}

将结果收集到内存中以查看数据。

t8=聚集（tt）

t8=8×5表年-月ARRREDLAY DEPDLAY UNIQUECHARRER{Uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuoooo1987 10 8 12{'PS'}1987年10.2120{'PS'}1987年10.13.12{12{1987年10.12{13.12{PS'

在高数组中检索指定的行数

打开生活的脚本

预览高表格中的前20行数据。

创建一个高的表airlinesmall.csv数据集。选择要处理的变量子集，然后处理“NA”值作为缺失数据，以便数据存储取代他们楠值。使用头查看前20行数据。

变量名={“年”,“月”,“ArrDelay”,“德布雷”,“UniqueCarrier”};ds =数据存储(“airlinesmall.csv”,“治疗减少”,“NA”,...“SelectedVariableNames”, varnames);T =高(ds)

Tt=MXT=MXT=Mx5高台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台月月月月月月延迟延迟延迟延迟延迟延迟延迟延迟，延迟延迟，延迟，延迟，延迟，非非台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台：：：：：：：：

tt=水头（T，20）

tt=20XT=20XT=20x5高台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台月月月月月月，延迟延迟延迟延迟，延迟，延迟，延迟，延迟，延迟，延迟，延迟，延迟，延迟，新台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台台：：：：：：：：

将结果收集到内存中以查看数据。

t20=聚集（tt）

t20=20×5表2007年10月（UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢卢年年年年年年年年的航空航空航空航空航空航空航空承运人，年年年年年年年（航空承运人，年年年（年年）））月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月月1987 1021{'PS'}1987 101615{'PS'}1987 1039{'PS'}1987 103915{'PS'}1987 10 57 32{'TW'}1987 10 0-3{'TW'}1987 10-14 0{'TW'}⋮