We have established that ^2.1 is a range, meaning all the real numbers
from 0 to 2.1, not including the 2.1.
What do you expect ^2.1 .. 2.5 to mean, That's a range (the "..") from
"^2.1", another range to the number 2.5. You can't have a range starting
with a range, A range is between two numbers. Hence the error message is
quite correct.
There are four infix operators which create ranges: "..", "^..", "..^" and
"^..^"
and the prefix operator "^:"; you're trying to mix two of them.
All of those take numbers as their arguments, not ranges.
Try something like
.say for 2.1 .. 2.5
You can try
.say for 2.1 ^.. 2.5
and then explain the output.
On Fri, 1 Jan 2021 at 18:59, ToddAndMargo via perl6-users <
perl6-us...@perl.org> wrote:
> >> ^ note: ^3 means the integer "just before" 3 (zero is presume to
> be the
> >> start point)
> >>
> >> 3^ means the integer "just after" 3 (an ending point is
> >> required)
> >>
> >>
>
> On 12/31/20 10:15 PM, Kevin Pye wrote:
> > No, it does not. Go back and read what Brad wrote; he was quite explicit.
> >
> > Nothing about the range 0 ..^ 3 (for which "^3" is just a short-cut)
> > says anything about integers. It is the range of numbers (real numbers
> > if you like) ranging from 0 to 3, but excluding 3. In standard
> > mathematical notation that would be "[0,3)". If you iterate over the
> > range then you start with the beginning of the range and keep adding one
> > until you reach the end (in this case ignoring the final value if it is
> > equal to the end-point).
> >
> > If the range were 0.5 .. 3 then the iterated values would be 0.5, 1.5
> > and 2.5.
>
>
> Hi Kevin,
>
> My notes were for "for" loops.
>
> > for ^2 {print "$_\n";}
> 0
> 1
>
>
> I am not able to reproduce your comments:
>
> > for ^2.1..2.5 {print "$_\n";}
> Range objects are not valid endpoints for Ranges
> in block <unit> at <unknown file> line 1
>
> > for ^2.1 .. 2.5 {print "$_\n";}
> Range objects are not valid endpoints for Ranges
> in block <unit> at <unknown file> line 1
>
> Would you mind throwing me an REPL example?
>
> Many thanks,
> -T
>
>
>
