On Saturday, 15 June 2013 at 14:42:38 UTC, monarch_dodra wrote:
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.
I mean that anyone with the code can use it without installing
anything but the compiler package. And third party could be the
first choice before it could be included.
