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L = length(X) returns the length of the largest array dimension in X. For vectors, the length is simply the number of elements. For arrays with more dimensions, the length is max(size(X)). The length of an empty array is zero.
sz = size(A) returns a row vector whose elements are the lengths of the corresponding dimensions of A. For example, if A is a 3-by-4 matrix, then size(A) returns the vector [3 4].
此 MATLAB 函数 返回 X 中最大数组维度的长度。对于向量，长度仅仅是元素数量。对于具有更多维度的数据，长度为 max(size(X))。空数组的长度为零。
L = length(X) returns the length of the largest array dimension in X. For vectors, the length is simply the number of elements. For arrays with more dimensions, the length is max(size(X)). The length of an empty array is zero.
L = length(obj) returns the length of a parallel object array obj. It is equivalent to the command max(size(obj)).
N = ndims(A) returns the number of dimensions in the array A. The number of dimensions is always greater than or equal to 2. The function ignores trailing singleton dimensions, for which size(A,dim) = 1. example.
Find the length of each string in str. Use strlength, not length, to determine the number of characters in each element of a string array.
dim — 查询的维度正整数标量 | 由正整数标量组成的向量 | 空数组. 查询的维度，指定为正整数标量、由正整数标量组成的向量或大小为 0×0、0×1 或 1×0 的空数组。. 如果 dim 的元素大于 ndims(A)，则 size 在对应的输出元素中返回 1。. 如果 dim 是空数组，则 size 返回 ...
If you create a struct by the struct command, the size of the array is determined by the data, if they are provided as a cell array: % as {1 x 2} cell. This is equivalent to: If you want S to be a scalar and contain the cell {1,2} as field A, use: % as {1 x 1} cell, which contains the cell {1,2}.
When you use a colon as a subscript in an indexing expression, such as A(:,n), it acts as shorthand to include all subscripts in a particular array dimension. It is also common to create a vector with a colon for the purposes of indexing, such as A(j:k).