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How to represent a Set or Dictionary in Chapel?


How to represent a Set or Dictionary in Chapel?

By : Roman Ondrejec
Date : November 19 2020, 03:01 PM
With these it helps Not all Chapel domains are sets, but 'associative domains' can be used as sets:
code :
var s : domain(string);
s.add("table");
s.add("chair");
s.add("emu");
writeln(s); // {chair, table, emu}
var t = {"table", "chair", "emu"}; // associative domain literal
var inds = {1, 2, 3, 7, 42};
var map : [inds] string;

map[3] = "foo";
map[42] = "bar";

inds.add(100); // add new index and element
assert(map[100] == "");
map[100] = "baz";

var lit = ["bob" => 1, "alice" => 2]; // assoc. array literal


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How do I represent dictionary of dictionary in Python

How do I represent dictionary of dictionary in Python


By : Pallavi
Date : March 29 2020, 07:55 AM
help you fix your problem What you're showing there is a set of 1-item dictionaries - which can't exist in Python, because the elements of sets must be hashable, and dictionaries aren't. However, a dictionary of dictionaries is perfectly straightforward to create:
code :
{
    1: {2: 3.4, 3: 5.6, 4: 7.8},
    2: {3: 6.4, 4: 66.6, 5: 64.8},
    3: {4: 33.4, 5: 5.46, 6: 72.8}
}
How can I represent a Python dictionary in UML?

How can I represent a Python dictionary in UML?


By : user3554529
Date : March 29 2020, 07:55 AM
this one helps. Qualified associations are useful for modeling maps/dictionaries.
See uml-diagrams.org for some examples.
how to represent a sorted dictionary?

how to represent a sorted dictionary?


By : Ankit Gupta
Date : March 29 2020, 07:55 AM
I hope this helps you . Iterating a dictionary yields keys; you can pass the dictionary itself to sorted.
code :
>>> x = {'a': 2, 'b': 4, 'c': 6, 'd': 6, 'e': 0}
>>> sorted(x, key=lambda key: (-x[key], key))
['c', 'd', 'b', 'a', 'e']
How do I do a bi-directional look up in Chapel for dictionary-like data?

How do I do a bi-directional look up in Chapel for dictionary-like data?


By : Alexander
Date : March 29 2020, 07:55 AM
this one helps. In Python, if I have a list I can find the index. This allows me to keep running IDs as I add things. , You can use push_back and find with 1D rectangular arrays:
code :
var A : [1..0] string;
A.push_back("spinach");
A.push_back("carrots");
const (found, idx) = A.find("carrots");
if found then writeln("Found at: ", idx);
// Found at: 2
var thingsDom : domain(string);
var things : [thingsDom] int;
var idxToThing : [1..0] string;
// ...
// add a thing
idxToThing.push_back(something);
const newIdx = idxToThing.domain.last;
thingsDom.add(something);
things[something] = newIdx;

assert(idxToThing[things[something]] == something);
How to represent a .NET dictionary type in UML?

How to represent a .NET dictionary type in UML?


By : Ray Search
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further It depends on what information you are trying to convey in your diagram. However you could:
Attach a stereotype to your relationship Use an association class Use a Ternary association Decide the collection type is an implementation detail and not show it Discover some additional behaviours about the association and promote
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