what this mean ---------> ifft([a b c])

I am now learning a code and I found this line that I do not understand. Please help.....thank!

a = ifft([signal(1:range_size/2) zeros(1,15*range_size) signal(range_size/2+1:range_size)]);

Answer 1

[Walter Roberson]

First item in this documentation list: http://www.mathworks.com/help/techdoc/ref/specialcharacters.html