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What does the number unifr nd (20 20,30, 1000, 1) in matlab mean?
Unifr nd (20 20,30, 1000, 1) means to generate an array of 1000* 1, and each element in this array is a random number distributed continuously and evenly between 20 and 30.

R=unifrnd(A, b, m, n, ...) is the expression form of a function, and returns a matrix with corresponding dimensions of m, n, ...

Extended data:

In 1970s, CleveMoler, director of the Computer Science Department of the University of New Mexico, wrote the earliest Matlab in Fortran language in order to reduce the programming burden of students.

MathWorks, founded by Little, Moler and SteveBangert in 1984, formally introduced Matlab to the market. By 1990s, Matlab has become the standard calculation software in the international control field.

Matlab: a unified function of one-dimensional, two-dimensional and three-dimensional numerical integration, which improves the performance of basic mathematics and interpolation functions.

Matlab compiler: You can download the Matlab compiler runtime (MCR) to simplify the distribution of compilers and components.

Image processing toolbox: realize automatic image registration through brightness index optimization.

Statistical toolbox: an enhanced interface for fitting, forecasting and drawing using linear, generalized linear and nonlinear regression.

System identification toolbox: used to identify continuous time and transfer function.

Baidu encyclopedia -MATLAB