Hi Damian --
This is a question that comes up from time to time, and to which I don't
feel confident we've done the right thing. Essentially what happens in
Chapel today is that the array slice a[2..3] is itself an expression with
array type over the indices 2..3 (like a small virtual array) and so the
next index [1] is being applied to the array expression returned by the
slice rather than the array elements of the original array / the slice.
This issue captures more about this topic, including my wrestling through
what it would take to do something different:
https://github.com/chapel-lang/chapel/issues/5568
Comments very welcome,
-Brad
On Sun, 18 Mar 2018, Damian McGuckin wrote:
Let's try something simpler:
This complete program works.
var a : [1..3][1..3] real;
a[1..3][1] = -3.0;
// a[2..3][1] = -3.0;
a[1..3][2] = 3.0;
a[1..3][3] = 3.0;
writeln(a);
Uncomment that comment and it does not.
var a : [1..3][1..3] real;
a[1..3][1] = -3.0;
a[2..3][1] = -3.0;
a[1..3][2] = 3.0;
a[1..3][3] = 3.0;
writeln(a);
failing with
halt reached - array index out of bounds:
What am I doing that is wrong? It's just slicing and dicing.
Regards - Damian
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