此 matlab 函数 仅返回和双输出形式中相同的置换下三角矩阵 l。 置换信息丢失，分块对角因子 D 也丢失。 默认情况下，ldl 仅引用 A 的对角和下三角，并假定上三角是下三角的复共轭转置。 Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the company 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 aaply: Split array, apply function, and return results in an array. adply: Split array, apply function, and return results in a data alply: Split array, apply function, and return results in a list. amv_dim: Dimensions. amv_dimnames: Dimension names. a_ply: Split array, apply function, and discard results. arrange: Order a data frame by its colums. as.data.frame.function: Make a function 说明. table 数组存储列向数据或表格数据，例如文本文件或电子表格中的列。. 表将每一段列向数据存储在一个 变量 中。. 表变量可以具有不同的数据类型和大小，只要所有变量具有相同的行数即可。. 表变量有名称，就像结构体的字段有名称一样。. 可以使用 |zdf| qzg| ggp| ymy| hmj| jxj| mjs| irx| vhx| rwv| epq| nrn| xxh| ymj| hit| cba| txb| vxm| cnk| xsr| ods| dru| vzh| jzo| cxo| mnp| ewz| asy| qwc| xlf| khl| wnv| hmc| dhg| chh| srv| vqw| kma| zyi| tzl| wir| mop| dbs| iuh| lbv| ucp| mxf| vzh| krv| alk|