R help - Nov 2005 - Plotting the diff. between two curves

Dear Rs

I have two vectors A and B
where

A is


            V1        d
1  0.000100000 1.123278
2  0.002186431 1.120448
3  0.004351214 1.106661
4  0.006515998 1.107713
5  0.008680781 1.107667
6  0.013010348 1.106353
7  0.019504698 1.104077
8  0.034658181 1.103202
9  0.051976447 1.103200
10 0.073624280 1.094825
11 0.093085682 1.085123
12 0.095250465 1.087325
13 0.132051782 1.086158
14 0.168853098 1.084814
15 0.233774949 1.077453
16 0.296553665 1.076972
17 0.298718448 1.077258
18 0.354981166 1.073860
19 0.383123349 1.068163
20 0.398276832 1.068830
21 0.415595099 1.068267
22 0.426419015 1.066104
23 0.478373815 1.064580
24 0.534636533 1.062743
25 0.694808850 1.060799
26 0.816015067 1.037726
27 0.818179850 1.038340
28 0.820344634 1.027501
29 0.826838983 1.022188
30 0.829003767 1.017346
31 0.839827683 1.016244
32 0.841992467 1.007883
33 0.846322033 1.007745
34 0.852816383 1.006360
35 1.000000000 1.000000

and  B is

           V1        d
1 0.000100000 1.123278
2 0.002186431 1.112518
3 0.004351214 1.104332
4 0.006515998 1.091071
5 0.008680781 1.003591
6 0.010845564 0.948444
7 1.000000000 0.948444


If I plot A and B, I will get two curves. However, is there any method to
find the signed difference between these two curves so that I will have only
one curve which shows the difference between these two curves?

Thanks
Prasanna





--
Prasanna BALAPRAKASH
IRIDIA, Université Libre de Bruxelles
50, Av. F. Roosevelt, CP 194/6
1050  Brussels
Belgium.
http://iridia.ulb.ac.be/~prasanna

	[[alternative HTML version deleted]]

Using the zoo package you can merge the curves together
and use na.approx to fill in the blanks.  Assuming that
the first column in each instance is the x variable:

library(zoo)
Az <- zoo(A[,2], A[,1])
Bz <- zoo(B[,2], B[,1])
Cz <- na.approx(merge(Az, Bz))
plot(Cz[,1] - Cz[,2])


On 11/25/05, Prasanna <prasannaprakash at gmail.com>
wrote:
> Dear Rs
>
> I have two vectors A and B
> where
>
> A is
>
>
>            V1        d
> 1  0.000100000 1.123278
> 2  0.002186431 1.120448
> 3  0.004351214 1.106661
> 4  0.006515998 1.107713
> 5  0.008680781 1.107667
> 6  0.013010348 1.106353
> 7  0.019504698 1.104077
> 8  0.034658181 1.103202
> 9  0.051976447 1.103200
> 10 0.073624280 1.094825
> 11 0.093085682 1.085123
> 12 0.095250465 1.087325
> 13 0.132051782 1.086158
> 14 0.168853098 1.084814
> 15 0.233774949 1.077453
> 16 0.296553665 1.076972
> 17 0.298718448 1.077258
> 18 0.354981166 1.073860
> 19 0.383123349 1.068163
> 20 0.398276832 1.068830
> 21 0.415595099 1.068267
> 22 0.426419015 1.066104
> 23 0.478373815 1.064580
> 24 0.534636533 1.062743
> 25 0.694808850 1.060799
> 26 0.816015067 1.037726
> 27 0.818179850 1.038340
> 28 0.820344634 1.027501
> 29 0.826838983 1.022188
> 30 0.829003767 1.017346
> 31 0.839827683 1.016244
> 32 0.841992467 1.007883
> 33 0.846322033 1.007745
> 34 0.852816383 1.006360
> 35 1.000000000 1.000000
>
> and  B is
>
>           V1        d
> 1 0.000100000 1.123278
> 2 0.002186431 1.112518
> 3 0.004351214 1.104332
> 4 0.006515998 1.091071
> 5 0.008680781 1.003591
> 6 0.010845564 0.948444
> 7 1.000000000 0.948444
>
>
> If I plot A and B, I will get two curves. However, is there any method to
> find the signed difference between these two curves so that I will have
only
> one curve which shows the difference between these two curves?
>
> Thanks
> Prasanna
>
>
>
>
>
> --
> Prasanna BALAPRAKASH
> IRIDIA, Universit?? Libre de Bruxelles
> 50, Av. F. Roosevelt, CP 194/6
> 1050  Brussels
> Belgium.
> http://iridia.ulb.ac.be/~prasanna
>
>        [[alternative HTML version deleted]]
>
>
>
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