On Fri, 1 Jan 2021 at 18:59, ToddAndMargo via perl6-users
<perl6-us...@perl.org <mailto: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
On 1/1/21 12:39 AM, Kevin Pye wrote:
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
> .say for 2.1 .. 2.5
2.1
> .say for 2.1 .. ^2.5
Range objects are not valid endpoints for Ranges
in block <unit> at <unknown file> line 1
and then explain the output.
Hi Kevin,
I am trying to get it to work in a "for" loop.
I am doing something wrong.
Would you mind sending me the proper syntax
for this from REPL?
-T
