if i consider i=1:1000, what does ':' mean in x(i,:)

In a for loop what does : mean in x(i,:) if i consider i=1:1000??

my coding is:

t=20
for i=1:t 
error(i,:)= errornew
end

Please help.

Thank you.

Answer 1

[Torsten]

It means that the first 20 rows of the matrix "error" are set to the vector "errornew".

Best wishes

Torsten.