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Krishna Nair | 1 Oct 22:53
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How can i derive a equation for my graph

I have drawn a graph with the data given below and would like the software to give a equation for my graph. Can it do that?

 

Wind Speed (m/s)

Power Output (kW)

0

0

1

0

2

0

3

0

4

4.9

5

18.2

6

34.1

7

59.6

8

86.5

9

125.9

10

160.9

11

190.6

12

221.2

13

244.4

14

255.5

15

263

16

267.6

17

272.2

18

272.3

19

272.4

20

273.5

 

Regards,

 

Krish

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Ivan Johansen | 6 Oct 07:59
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Re: Boxed axes style

plasteck wrote:
> When I use boxed axes style and I have text label, I cannot use
> PLecement->Below x-axis/Left of y-axis because it turns invisible. I
> know that it is placed in place which is not shown but I would rather
> that axes move a little to make text label visible.

Thanks for the suggestion. I will see what I can do about it.

Best regards
Ivan Johansen

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Ivan Johansen | 6 Oct 08:15
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Re: How can i derive a equation for my graph

Krishna Nair wrote:
> I have drawn a graph with the data given below and would like the 
> software to give a equation for my graph. Can it do that?

Yes, first you add your points to a point series. Next you can use 
"Function|Insert trendline" to create a line of best fit. You may want 
to check the help for this dialog as it has several options.

Best regards
Ivan Johansen

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Tom Gettys | 6 Oct 16:58
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Re: How can i derive a equation for my graph

Hi Ivan,
I tried that using the data that was provided by Krishna, but was unsuccessful.

The data plots as an 'S' curve, so a logistic model is implied.  Since that is not one of the built-in models I
tried the user-defined tab, which offers a growth-saturation model.  I could not figure out how to get it to
match the data, even slightly.  

I understand that it is determined by the initial guesses, but I could find none that worked.  I also tried
entering a more traditional logistic model that has 3 parameters, but there was some error message
(something about a list, error code -1; I forget now).

Do you have any suggestions?

Tom Gettys
Lane Community College
email:  gettyst <at> lanecc.edu
phone: (541) 463-3147
office: Bldg. 16/267

To dream of the person you would like to be is to waste the person you are.
>>> Ivan Johansen <graph <at> padowan.dk> 10/05/08 11:18 PM >>>
Krishna Nair wrote:
> I have drawn a graph with the data given below and would like the 
> software to give a equation for my graph. Can it do that?

Yes, first you add your points to a point series. Next you can use 
"Function|Insert trendline" to create a line of best fit. You may want 
to check the help for this dialog as it has several options.

Best regards
Ivan Johansen

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Ivan Johansen | 8 Oct 22:34
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Re: How can i derive a equation for my graph

Tom Gettys wrote:
> I tried that using the data that was provided by Krishna, but was
> unsuccessful.

I admit that creating user defined trendlines are not as easy as I could 
hope. I have some ideas how to improve it though.

As you say it is a logistic function. In the Insert trendline dialog, 
you can add the model $a*$b^x/($c+$d^x). I think the default guess is 
good enough.

When I use this model I get the function
f(x)=1.1713331*1.0026039^x/(0.0044819577+0.55890587^x)

This seems to fit the data very well.

Best regards
Ivan Johansen

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Tom Gettys | 8 Oct 22:36
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Re: How can i derive a equation for my graph

Thanks much Ivan!
 
Tom Gettys
Lane Community College
email:  gettyst <at> lanecc.edu
phone: (541) 463-3147
office: Bldg. 16/267

To dream of the person you would like to be is to waste the person you are.

>>> Ivan Johansen <graph <at> padowan.dk> 10/8/2008 1:34 PM >>>
Tom Gettys wrote:
> I tried that using the data that was provided by Krishna, but was
> unsuccessful.

I admit that creating user defined trendlines are not as easy as I could
hope. I have some ideas how to improve it though.

As you say it is a logistic function. In the Insert trendline dialog,
you can add the model $a*$b^x/($c+$d^x). I think the default guess is
good enough.

When I use this model I get the function
f(x)=1.1713331*1.0026039^x/(0.0044819577+0.55890587^x)

This seems to fit the data very well.

Best regards
Ivan Johansen


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Mohamed Aly | 13 Oct 12:33

[SPAM] begad sory yagameel

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Mohamed Aly | 13 Oct 12:33

[SPAM] begad sory yagameel

تحية طيبة وبعد ‘‘‘

بجد انا مش عارف اقولك ايه بس كل ذلك كان خارج عن إرادتى

بس اوعدك انى مش هتاخر بس تدينى موافقه وانا هخلص باسرع وقت

وفى النهايه احب اقولك بجد وحشتونى واتمنى اننا نتقابل فى القريب

مستنى ردك . بص على الصور وادينى ريك

وسلام مؤقت

 

 

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Mohamed Aly | 13 Oct 12:33

[SPAM] begad sory yagameel

تحية طيبة وبعد ‘‘‘

بجد انا مش عارف اقولك ايه بس كل ذلك كان خارج عن إرادتى

بس اوعدك انى مش هتاخر بس تدينى موافقه وانا هخلص باسرع وقت

وفى النهايه احب اقولك بجد وحشتونى واتمنى اننا نتقابل فى القريب

مستنى ردك . بص على الصور وادينى ريك

وسلام مؤقت

 

 

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