Math Is Fun Forum

valdense

Member

Registered: 2011-09-07

Posts: 4

imposible equation

> hi,
> I need help on how to solve the following:
> I have a, b and c, they are my variables.
>
> Given the values the answer is on the right: (notice how the answer varies...)
> 0, 1, 1, 0.81
> 0, 1, 1, 0.86
> 0, 1, 1, 0.79
> 0, 1, 1, 0.8
> 0, 1, 1, 0.8
> 0, 1, 1, 0.84
> 0, 1, 1, 0.88
> 0, 1, 1, 0.75
> 0, 1, 1, 0.74
>
> or cahnging the values to the below:
1, 0, 1, 8.84
1, 0, 1, 8.69
1, 0, 1, 7.63
1, 0, 1, 7.46
1, 0, 1, 5.98
1, 0, 1, 7.91
1, 0, 1, 6.91
1, 0, 1, 8.42
1, 0, 1, 8.81
1, 0, 1, 8.54
1, 0, 1, 8.34

>
> all i want is a clue on how to solve this.
> can you help?
> thank you

Last edited by valdense (2011-09-07 13:28:54)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

Hi valdense;

Welcome to the forum! That is not an equation, that is a bunch of columnar data where the first column is a, the second b and the third c. Am I right?

What you appear to want is a relation between a,b,c that gives you the 4th column. This is a curve fitting problem.

I can fit that but I need some info from you.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

valdense

Member

Registered: 2011-09-07

Posts: 4

Re: imposible equation

bobbym,
you're right.
what else do you need?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

What form do you think the fit is:

A linear fit?

c1*a + c2*b + c3*c = 4th column

A non linear fit? In other words do you have any thoughts on what the form should look like. Knowing where that data comes from might help.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

valdense

Member

Registered: 2011-09-07

Posts: 4

Re: imposible equation

I don't know the mathematical transactions that are behind this.
All the info i have is that using these three variable values gives you the variable answer (4th column).

valdense

Member

Registered: 2011-09-07

Posts: 4

Re: imposible equation

for example for the combination of 1,1,1
the answer is always going to be >=5 and <11

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

Hi valdense;

1,1,1 is not in the above data! I am going to need it all to have any chance. No guessing, I need everything you have.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: imposible equation

hi bobbym

how does one post a "Help Me!" kind of question into the "Formulas" sub-forum?

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

He did post in the wrong section. I have moved it.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: imposible equation

There are many other help me kinds of threads in this section.But it is not urgent,so i think those can wait a while longer.

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

Hi;

I will do my best.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: imposible equation

you always do

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

I try to please every member. But remember the forum is not called bobbym. MIF is the boss and I work for him. For major changes I would have to consult him first.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: imposible equation

I know that.I have no doubts in either you or MIF.

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: imposible equation

Hi;

Is it not kind of late for you?

Looking at this original question, the OP never did answer any of my questions so that this could be solved. I wonder why that happens? Do people just forget about the problems?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.