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## #1 2014-02-05 22:50:49

evinda
Member
Registered: 2013-04-13
Posts: 105

### which is the right result?

Hey!!I have a question..
Suppose  base=10 , precision t=3, -L=U=10 and

I want to calculate the relative error for B.
We don't make rounding.For example,if we have the value 345.924 it is equal to
and the corresponding floating number is
.

Could you tell me which is the result,so I can check mine?

Last edited by evinda (2014-02-06 01:55:29)

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## #2 2014-02-06 01:50:33

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,194

### Re: which is the right result?

Hi evinda;

I am afraid I do not understand what you want. What do you want to check the relative error for?

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

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## #3 2014-02-06 01:54:40

evinda
Member
Registered: 2013-04-13
Posts: 105

### Re: which is the right result?

bobbym wrote:

Hi evinda;

I am afraid I do not understand what you want. What do you want to check the relative error for?

I found the relative error

but I don't know if the result that I found is right.

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## #4 2014-02-06 02:02:36

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,194

### Re: which is the right result?

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Online

## #5 2014-02-06 02:07:46

evinda
Member
Registered: 2013-04-13
Posts: 105

bobbym wrote:

I found

.

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## #6 2014-02-06 02:13:18

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,194

### Re: which is the right result?

Is this what you are calculating?

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Online

## #7 2014-02-06 02:33:15

evinda
Member
Registered: 2013-04-13
Posts: 105

### Re: which is the right result?

bobbym wrote:

Is this what you are calculating?

Yes, I calculate the real value of this

and its value as a floating-point number.
So,the result I am looking for should have the form

Last edited by evinda (2014-02-06 02:34:53)

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## #8 2014-02-06 02:38:22

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,194

### Re: which is the right result?

The exact value is 3 / 10, now what did you get for your floating point value?

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Online

## #9 2014-02-06 02:40:01

evinda
Member
Registered: 2013-04-13
Posts: 105

### Re: which is the right result?

bobbym wrote:

The exact value is 3 / 10, now what did you get for your floating point value?

I got

..Is this right?

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## #10 2014-02-06 02:43:37

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,194

### Re: which is the right result?

1? How did you get that?

I can calculate the relative error of that answer if you like.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Online