what is happening here?

for j = 1:6 - 1

if sign(i(j,1)) * sign(i(j+1,1)) == -1

m = m + 1;

end

end

in this code what does "1:6-1" means?

Answer 1

[Star Strider]

‘in this code what does "1:6-1" means?’

It is a kludgy way of writing:

1:5

as running it will demonstrate:

q = 1:6-1

produces:

q =
     1     2     3     4     5

Answer 2

[Image Analyst]

Try it in the command window:

>> 1:6-1
ans =
     1     2     3     4     5

First it does (6-1) to create a scalar 5, then it goes from 1 to (6-1) or 1 to 5 to give [1,2,3,4,5].