In Matlab, the length function is used to return the number of elements in a vector, array or string. The following are some usage examples of the length function:
1. Return the number of elements in the vector:
v = [1, 2, 3, 4, 5]; numElements = length(v); % 结果为5
2. Return the number of rows or columns in the matrix:
m = [1, 2, 3; 4, 5, 6; 7, 8, 9]; numRows = length(m); % 结果为3（行数） numColumns = length(m(:)); % 结果为3（列数）
3. Return the number of characters in the string:
str = 'Hello, world!'; numChars = length(str); % 结果为13（字符数）
It should be noted that for non-string type input, the length function returns the number of elements; for string type input, the length function returns is the number of characters.
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