On Saturday, 15 June 2013 at 13:23:07 UTC, Carlos wrote:
On Saturday, 15 June 2013 at 12:36:26 UTC, monarch_dodra wrote:
On Saturday, 15 June 2013 at 11:44:03 UTC, Carlos wrote:
On Saturday, 15 June 2013 at 08:46:13 UTC, John Colvin wrote:
On Saturday, 15 June 2013 at 02:05:00 UTC, Carlos wrote:
I'm interested in this kind of functionalities; Does D have
something on this ?
I thought about something like a "eval" function that would
use
specified algorithms.
something likes this
import std.stdio, std.math, std.eval;
void main()
{
eval(Real; a+b^^x+c=56){
algor.brute(&result);
}
writeln("Positive value is : ", result);
}
It's not clear what that would do from your example. I
presume a, b and c are defined somewhere and eval solves for
x?
algor.brute does the work. IF you know that algorithm you
would know what it does.
Another question would be if this way of coding makes sense
to you.
This is what the "eval" function does ( in theory ), It takes
The words : Real, Rational, Irrational or R, Q , Q' and from
there is defined which numerical group is going to be used
for the evaluation. Then it identifies the operators and
variables and defines the equation in a format like a text
format with a end file character in the end so equations can
be as long as you want. After that between {algor.(name)} in
name you call the algorithm you want to use for the
evaluation there can be predefined algorithm with D but maybe
you can define your own algorithms.
What do you think does this makes sense or would you
implement it other way ?
D provides no such thing. AFAIK, there is nothing in Phobos
provided that does it either.
It should be doable, where the second argument is a string.
Something like:
auto eq = Equation(Real, "a+b^^x+c=56");
auto result = Equation.brute();
I think it would quite a specialized numerical library though,
so I don't think it would find its way into the standard
library.
I'm not sure any such D Library exists. You'll either have to
port an existing library, or link with a C/C++ existing
library.
OK but if developed it would be included in D ? Right ? It
would be very useful I think.
Depends what you mean by "included in D" ? In the standard
library, I wouldn't know (but I don't think so). But that doesn't
mean it couldn't be distributed as a trusted and reliable third
party library.
