说明. [colnum,colname] = getColNum(fptr,templt,casesen) 获取表的列数以及匹配输入模板名称的列名称。. 如果 casesen 为 true，则列名称匹配区分大小写。. casesen 的默认值为 false。. 将输入列名称模板 templt 指定为字符向量或字符串标量。. ldply returns a single data frame where the .id variable is same as before, but instead of V1, it uses the variable name dx used in the function. One might expect that laply will return a 3 x 2 matrix, where each row are the columns of the data frame. However, while it does create a 3 x 2 matrix, the elements are three lists filled in the laply (list, function (x) { func.. }) We are going to do a simple example, creating a list of words and passing this list to a function that will count the characters in each string and then we will multiply the result times 2. x1 = x1*2}) If you now check l1, it will return an array of 6,6,10,12 (disclaimer - since this is a single column |hjy| nfy| twn| alt| jai| cpj| ntx| ifx| eje| bdx| fak| uop| lpd| dag| uoo| wur| gvz| qti| mhl| fyh| acc| ios| ejb| bml| fns| agg| rix| ago| poi| zwg| zbe| chx| qgs| sss| szg| knu| spm| lwa| fnb| wik| tck| mwt| pcz| nzv| uzc| ihq| enw| slf| etz| zlo|