Hi, what does ; exactly mean?

I know that .* mean that you multiple the two elements of equally sized arrays. But in the first array and second the ; symbol occurs, but what is the exact meaning of this symbol? here is function

x=[1 2;3 4;5 6; 7 8].*[1;2;3;4]

[Stephen23]

https://www.mathworks.com/help/matlab/learn_matlab/matrices-and-arrays.html

Many basic MATLAB concepts, such as how to create matrices, are explained in the introductory tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

Answer 1

[Jan]

Please read the Getting Started chapters of the documentation. This is recommended for beginners also: https://www.mathworks.com/learn/tutorials/matlab-onramp.html . Learning the basics from the manuals is more efficient than asking them in the forum.

The semicolon inside the concatenation operator [ ] or inside { } means a horizontal concatenation. Try it:

a = [1, 2]

a = 1×2

1 2

size(a)

ans = 1×2

1 2

b = [1; 2]

b = 2×1

1 2

size(b)

ans = 1×2

2 1

Answer 2

[Alan Stevens]

It means start a new row, e.g.

x = [1 2; 3 4];
disp(x)

     1     2
     3     4