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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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,998

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,998

Re: which is the right result?

What is your result?


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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

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

Re: which is the right result?

bobbym wrote:

What is your result?

I found

.

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

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,998

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

#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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,998

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

#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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,998

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

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