Is there a way to output the values of an associative array based
on the lexicographic order of the keys?
For example, if foo = ["VXE":8, "BZP":5, "JLC":2], I'd like to
output something like:
5
2
8
Thanks!
Samir
On Sunday, 25 August 2019 at 17:01:23 UTC, a11e99z wrote:
auto foo = ["VXE":8, "BZP":5, "JLC":2];
foo.byPair.array.sort!"a[0]
On Sunday, 25 August 2019 at 19:03:10 UTC, JN wrote:
I think normal lambdas are better than these string ones:
foo.byPair.array.sort!((a, b) => a[0] < b[0]).map!(a =>
On Tuesday, 27 August 2019 at 16:12:07 UTC, berni wrote:
What's your oppinion on this?
As someone relatively new to programming in general and to D in
particular, this behavior does, on the surface, seem
inconsistent. Good to see that a bug exists for this, per
ag0aep6g.
I never understoo
On Monday, 24 March 2008 at 17:41:11 UTC, Steven Schveighoffer
wrote:
I know you fixed the problem, but just an FYI, the reason is
because when you import rollDice, you bring both rollDice the
module and rollDice the function into the global namespace
(which confuses the compiler 'cause it does
On Saturday, 22 September 2018 at 01:58:57 UTC, Adam D. Ruppe
wrote:
You probably shouldn't name a module the same as a member
anyway, and it should also have two names, like "module
myproject.isprime;"
But the fix here is to just use the full name.
import isPrime;
void main() {
isPrime.isP
What is the proper way to find the unique values of an array and
store them in another array? When I try:
import std.stdio: writeln;
import std.conv;
import std.algorithm;
void main() {
int[] unsortedArray = [5, 3, 8, 5, 2, 3, 0, 8];
int[] uniqueArray;
uniqueArray = uniq(sort(unso
On Thursday, 18 October 2018 at 18:53:06 UTC, Adam D. Ruppe wrote:
But, if you need to copy it into a new array, use `.array` at
the end.
Thanks. That did the trick. But if I may, what is the
difference between
uniqueArray = uniq(sort(unsortedArray)).array;
and
uniqueArray = unsortedArra
On Thursday, 18 October 2018 at 19:25:26 UTC, Adam D. Ruppe wrote:
Which is better simply depends on which one reads better to you.
Thanks again, Adam.
I am working my way through the exercises in the "Programming in
D" tutorial (http://ddili.org/ders/d.en/arrays.html). Why is the
line assigning the length of the dynamic array required?
/*
Write a program that asks the user how many values will be
entered and then
reads all of them. Have the
Stanislav, Ali, Mike -- Thank you all for your thoughtful and
helpful replies to my queries. Apologies that it has taken this
long to reply to you. I still haven't been able to find time to
go through all of the code examples provided but hope to do so
later this week. If I have additional q
Is it possible to write and execute a D program without a main
function?
Most of my programs will start with some `import` statements,
followed by any functions and then ending with the `main`
function (e.g. `void main() {`).
As I am just a beginner to programming and still new to D, I have
Ok. Upon further investigation, I think I see what is going on.
Most of the repos I am skimming are for this year's Advent of
Code. They structure their repo with an `app.d` file which does
contain a `main` function but this program is structured such
that it imports the files I was looking
On Saturday, 8 December 2018 at 03:30:30 UTC, Jonathan M Davis
wrote:
There's one main per program, not per module. Where main lives
depends on how the program was written, but dub encourages
putting it in app.d, because that's what it generates when you
create a new dub project. imports then p
I saw the following thread[1] today on Hacker News that discusses
an article that compares how various languages compute
.0 - 9998.0. A surprisingly large
number of languages return 2 as the answer. I ran the following
which returned 1:
import std.stdio: writeln;
On Sunday, 6 January 2019 at 01:05:08 UTC, Adam D. Ruppe wrote:
That's because it is done at compile time, since both are
compile-time constants. The compiler will evaluate it using the
maximum precision available to the compiler, ignoring your
request to cast it to double (which annoys some pe
I am trying to run the code from the "Simple Example" listed in
the matplotlib-d package page[1] and am running into the
following error:
$ dub build
Performing "debug" build using
/usr/home/samir/dlang/dmd-2.082.0/freebsd/bin64/dmd for x86_64.
matplotlib-d 0.1.4: building configuration "libr
On Monday, 18 February 2019 at 18:27:17 UTC, Andre Pany wrote:
Therefore python needs to be installed and also
matplotlib.pyplot.
Hi Andre,
I do have both python3 and matplotlib installed:
$ python3
Python 3.6.7 (default, Jan 10 2019, 01:15:48)
[GCC 4.2.1 Compatible FreeBSD Clang 6.0.0
(t
On Monday, 18 February 2019 at 16:32:26 UTC, belkin wrote:
Obviously I need a compiler (which one is best ).
I too am a beginner (both at programming and at D). I have been
sticking to the dmd compiler (over others such as gdc or ldc)
mainly because that is what the two reference books[1] I
On Monday, 18 February 2019 at 19:44:56 UTC, Samir wrote:
that is what the two reference books[1] I am using to learn D
have been using.
Idiot me forgot to mention the two resources I have been using:
(1) "Programming in D", by Ali Çehreli, available at
http://ddili.org/ders/d.en/index.html
(2
On Monday, 18 February 2019 at 20:30:23 UTC, Andre Pany wrote:
The issue is, the dub package is using python 2 (it executes
application python) while you have installed matplotlib for
Python 3 (application python3).
Thank you for that! After installing the version of matplotlib
for python2 a
On Monday, 18 February 2019 at 21:50:25 UTC, Andre Pany wrote:
In the meantime you could adapt the python script on your local
file system in the dub packages cache folder as described here
https://github.com/koji-kojiro/matplotlib-d/pull/11/files
Andre,
Thank you very much for your help toda
On Tuesday, 19 February 2019 at 11:57:00 UTC, Andre Pany wrote:
The python script generates a list of available functions in
the python package.
This list will be used to generate D coding at compilation time.
That is the reason, the error occurs in a mixin.
Unfortunately one function had the sa
I am belatedly working my way through the 2018 edition of the
Advent of Code[1] programming challenges using D and am stumped
on Problem 3[2]. The challenge requires you to parse a set of
lines in the format:
#99 @ 652,39: 24x23
#100 @ 61,13: 15x24
#101 @ 31,646: 16x28
I would like to store e
On Sunday, 3 March 2019 at 19:27:17 UTC, user1234 wrote:
oops forgot the bang
auto allMatches = matchAll(line, pattern).map!(a =>
a.hit).array;
Thanks, user1234! Looks like `map` is another topic I need to
read up upon. I slightly modified your suggestion and went with:
auto allMatches
On Monday, 4 March 2019 at 18:57:34 UTC, dwdv wrote:
There is also std.file.slurp which makes this quite easy:
slurp!(int, int, int, int, int)("03.input", "#%d @ %d,%d:
%dx%d");
That's brilliant! This language just keeps putting a smile on my
face every time I learn something new like this!
I am trying to read from a text file using the following code:
import std.stdio;
import std.string;
void main() {
File file = File("test.txt");
string line;
while (!file.eof()) {
line = strip(file.readln());
if (line[0] == '>') { // line 10
writel
On Sunday, 16 June 2019 at 23:03:04 UTC, aliak wrote:
stripping the last line could result in an empty line if it
just has strippable characters?
The last line of the file is just text but without a newline (\n)
character or any other whitespace character at the end. I get
the same error wh
On Sunday, 16 June 2019 at 23:03:04 UTC, aliak wrote:
stripping the last line could result in an empty line if it
just has strippable characters?
The last line is just the text of the last line. There is no
newline character at the end. I also get the same error if I
remove the strip functi
On Sunday, 16 June 2019 at 23:55:41 UTC, lithium iodate wrote:
There is *very* likely to be a terminating new-line at the end
of the file (many editors add one without asking!). If that the
case, the last line seen by the loop will be empty and you must
not attempt to access any elements.
On
On Monday, 17 June 2019 at 03:46:11 UTC, Norm wrote:
On Monday, 17 June 2019 at 00:22:23 UTC, Samir wrote:
Any suggestions on how to rectify?
You could change the IF to
`if(line.length > 0 && line[0] == '>')`
Thanks, Norm. That seemed to do the trick and fixed the error.
On Monday, 17 J
On Tuesday, 18 June 2019 at 09:42:41 UTC, aliak wrote:
On Tuesday, 18 June 2019 at 01:15:54 UTC, Samir wrote:
On Monday, 17 June 2019 at 03:46:11 UTC, Norm wrote:
That's because you're using write*ln*. So even though line is
empty, you still output a new line.
Curious. I am going to have to
D already has a function to calculate the Levenshtein
distance[1]. I am trying to come up with a function to calculate
the Hamming distance[2] between two strings, `a` and `b`. So
far, this seems to work:
foreach (i, j; zip(a, b)) {
if (i != j)
++hammingDistance;
}
Is there a wa
On Sunday, 23 June 2019 at 13:29:25 UTC, KnightMare wrote:
zip( "hello world", "Hello World" ).map!"a[0] != a[1]".sum
Excellent! Thank you!
How come this works:
int[][] ta = [[2, 1, 4, 3], [3, 10, 2, 5]];
writeln(ta[1].maxElement); // 10
but I get an error when specifying the number of elements when
declaring the array:
int[4][2] ta = [[2, 1, 4, 3], [3, 10, 2, 5]];
writeln(ta[1].maxElement); // get error on this line
Error: temp
On Sunday, 30 June 2019 at 15:38:42 UTC, a11e99z wrote:
try to take slice from static arrays
writeln(ta[1][].maxElement);
That does what I am looking for. Thank you for the quick reply!
Is there a cleaner way of finding the maximum value of say the
third column in a multi-dimensional array than this?
int[][] p = [[1,2,3,4], [9,0,5,4], [0,6,2,1]];
writeln([p[0][2], p[1][2], p[2][2]].max);
I've tried the following
writeln([0, 1, 2].map!(p[a][2]).max);
but get an "Error: undefine
On Friday, 5 July 2019 at 01:41:38 UTC, 9il wrote:
You may want to take a look into mir-algorithm [1] library.
It contains ndsilce package [2] to work with multidimensional
data.
Thanks for referring me to this library, Ilya. I will have to
check this out. While it seems a bit more complica
On Friday, 5 July 2019 at 13:56:18 UTC, Craig Dillabaugh wrote:
Ali's book is targeted at beginners (see link below). I don't
see why D wouldn't make a good first language. If your
objective is to learn D, then I don't think learning C or
Python is going to be help that much. Obviously if yo
On Friday, 5 July 2019 at 00:54:15 UTC, Samir wrote:
Is there a cleaner way of finding the maximum value of say the
third column in a multi-dimensional array than this?
int[][] p = [[1,2,3,4], [9,0,5,4], [0,6,2,1]];
writeln([p[0][2], p[1][2], p[2][2]].max);
I've tried the following
writeln([0,
On Friday, 5 July 2019 at 19:56:54 UTC, ag0aep6g wrote:
It works when you pass an actual callable instead, e.g. a
lambda:
p.map!(a => a[column]).maxElement.writeln;
On Friday, 5 July 2019 at 20:22:14 UTC, dwdv wrote:
Furthermore, Samir, the parameter `a` can be renamed to
whatever you prefer
40 matches
Mail list logo
