what's the n -space- 1 mean here?

i'm learning about Matlab function now. this is one of the official answers of a course. i know it's very basic. but i'm confuse about it. here is the code..

function v = int_col(n)

    v = [n 1:n-1]';
end

Answer 1

[Image Analyst]

If n = 4, then it's saying create a row vector where 4 is the first value and it's followed by 1 to n-1, in other words, followed by [1,2,3]. So the final vector would be [4, 1, 2, 3]. MATLAB style guidelines say that there should be a comma rather than a space, and sometimes (like if you did a Code Analyzer report and the row vector is the output of a function) you'll get an orange squiggle if you don't have it.

[Star Strider]

‘... create a row vector ...’

... and then transpose it to a column vector ...

Answer 2

[Jan]

The space is a smart way for a neater notation. It would be clearer to insert the (optional) comma:

v = [n, 1:n-1]';

Then [a, b] means, that the vectors a and b are concatenated horizontally. Matlab allows to omit the comma, but this can confuse the reader (e.g. you). It is not trivial to understand, what exactly happens in these cases:

[1 2]
[1 -2]
[1 - 2]
[1 -...
2]
[1 -...
 2]
[1 ...
 -2]
[1
 -2]

Therefore I insert a comma and a semicolon where ever this is allowed and meaningful. Omitting it might save 0.1 seconds during typing and demand for minutes during debugging. I prefer:

 [1, -2]
 [1; ...
  -2]

In addition I liek to insert spaces around operators and avoid a decimal dot without leading or trailing number. See:

.2.^.2      % Correct
0.2 .^ 0.2  % Less confusing