The three dots '...' tell matlab that the code on a given line continues on the next line.
It is used so that command lines don't stretch out too long to print or read easily.
ex.
set(1,'Position',[0,0,1,1],'Tag','MyTag','Color', ...
[.94,.94,.94]);
This code is interpreted as a single set command with multiple parameters.
In the script you posted, the line in question would actually be interpreted like this:
h = n = 2*pi/h;
which should cause an error.
Whoever wrote the script must be using it as a place holder for something else.
