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

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,908

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

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.Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,908

What is your 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.**

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

bobbym wrote:

What is your result?

I found

.Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,908

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.**

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

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,908

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.**

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

bobbym wrote:

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

I got

..Is this right?Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,908

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.**

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