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- Project Ideas (http://www.programmingforums.org/forum50.html)

- - 5d (http://www.programmingforums.org/showthread.php?t=887)

dnathe4th

Oct 17th, 2004 12:37 PM

What would the easiest way to go about scripting, or writing a program, that output all the (positive) solutions to a 5dimensional problem?
for instance:
(1/2)A + (1/4)B + (1/8)C + (1/16)D + (1/32)E = 1/2

Ooble

Oct 17th, 2004 2:13 PM

I take it you mean (1/2)x + (1/4)x + (1/8)x + (1/16)x + (1/32)x = 1/2. The solution is to parse it into some sort of array or something that holds all the info, and then rearrange the equation I know this doesn't really help, but there's more ;). Apparently Perl is brilliant for this sort of thing - look it up.

dnathe4th

Oct 17th, 2004 2:36 PM

I used different letters rather than "X" because each variable needs to be different based on the coefficient. I'll get back to this post once i work it out

Ooble

Oct 17th, 2004 4:36 PM

Ah... you mean ax^5 + bx^4 + cx^3 + dx^2 + ex = 0? I see... sounds complicated...

Ade	Oct 17th, 2004 4:44 PM

may i ask why you need this?

dnathe4th

Oct 17th, 2004 8:24 PM

Ooble, i mean as in :
(1/2)A + (1/4)B + (1/8)C + (1/16)D + (1/32)E = 1/2
as stated in my first post :P

Ade: It was a homework assignment for my brother (he's 12, i think they were just supposed to guess the answer), and being the programming dood i am, i wanted to figure out if it could be done by a program, since most things can, but i didn't know where to start, so i came here

Ooble

Oct 18th, 2004 11:02 AM

Heh... sorry. That's my mind twisting things until they bear no resemblance to the original for ya.... be glad I'm not malicious :P

Pizentios

Oct 18th, 2004 4:39 PM

What Class? Pre-Calc? Or Calc?

Mjordan2nd

Oct 18th, 2004 4:56 PM

I'm guessing you mean all integers for values A, B, C, D, E. I just limited this to a 10 due to time constraints. I'm not sure this is what you want, but run this and tell me:

#include <stdio.h>

                                                        

int main(void)

{

    int a, b, c, d, e;

    FILE *fp;

    fp=fopen("answers.dat", "w+");

    for(a = 0; a<10; a++)

    {

        for(b=0; b<10; b++)

        {

            for(c=0; c<10; c++)

            {

                for(d=0;d<10;d++)

                {

                    for(e=0;e<10;e++)

                    {

                        if(((.5*a) + (.25 * b) + (.125 * c) + (.0625 * d) + (.03125 * e)) == .5)

                        {

                            fprintf(fp, "a=%d\nb=%d\nc=%d\nd=%d\ne=%d\n\n", a, b, c, d, e);

                        }

                    }

                }

            }

        }

    }

                                                        

    return 0;

}

Ade	Oct 19th, 2004 4:05 PM

This all brings back painful memoriesof A-level math

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