NO
> aggregate(si[,7],list(si[,2],si[,1]),mean)
   Group.1 Group.2           x
1      0.0       D 212.5015448
2      0.2       D 200.5271137
3      0.4       D 191.5387529
4      0.6       D 131.5856218
5      0.8       D  16.4515798
6      1.0       D   0.9698699
7      0.0       F 211.6176036
8      0.2       F 199.5358336
9      0.4       F 179.1472057
10     0.6       F  70.3376311
11     0.8       F  25.0939253
12     1.0       F   0.9759778
13     0.0       I 199.1829674
14     0.2       I 188.8703456
15     0.4       I 147.5194562
16     0.6       I  18.1743204
17     0.8       I   0.9563789
18     1.0       I   0.9531993
19     0.0       L  95.1813009
20     0.2       L  95.1813009
21     0.4       L  92.3533476
22     0.6       L  47.1235041
23     0.8       L   9.4129464
24     1.0       L   0.9336508
25     0.0       S  95.1813009
26     0.2       S  91.4119070
27     0.4       S  81.9875960
28     0.6       S  11.3183831
29     0.8       S   1.8843307
30     1.0       S   0.9310779

for exemple, for the last line, I want aggregate to show me the number of
lines with col1=1 and col2=S in stead of the mean.

Regards



2011/10/22 Weidong Gu <anopheles123@gmail.com>

> Is this waht you want?
>
> sci[,5][sci[,2]==0 & sci[,1]==L]
>
> Weidong
>
> On Sat, Oct 22, 2011 at 8:19 AM, Adel ESSAFI <adelessafi@gmail.com> wrote:
> > Hi,
> > It is not what I want, but, thx anyway.
> > Regards
> >
> >
> > 2011/10/22 Weidong Gu <anopheles123@gmail.com>
> >>
> >> try this
> >>
> >> table(sci[,2]=0,sci[,1]=L)
> >>
> >> Weidong Gu
> >>
> >> On Sat, Oct 22, 2011 at 7:51 AM, Adel ESSAFI <adel.safi@imag.fr> wrote:
> >> > Hello,
> >> > is there any help please.
> >> > Regards
> >> >
> >> >
> >> > 2011/10/21 Adel ESSAFI <adelessafi@gmail.com>
> >> >
> >> >> Hello
> >> >> I am discovering R and I find it is really very powerful.
> >> >>
> >> >> However, I find some newbie difficulties.
> >> >>
> >> >> Here, I have a data frame with manu values that I want to calculate
> the
> >> >> frequency (the nomber of line) of the some criteria.
> >> >> For exemple here,  I want it to print the number of occurence where
> >> >> sci[,2]=0 and sci[,1]=L. In my exemple, he is printing the number of
> >> >> the
> >> >> line in the result data frame.
> >> >> however, I have at least 90 line with sci[,2]=0 and sci[,1]=L.
> >> >> Thank you in advance for any input.
> >> >>
> >> >>
> >> >> >  aggregate(sci[,5],list(sci[,2],sci[,1]),frequency)
> >> >>    Group.1 Group.2 x
> >> >> 1      0.0       L 1
> >> >> 2      0.2       L 1
> >> >>
> >> >>
> >> >> --
> >> >> PhD candidate in Computer Science
> >> >> Address
> >> >> 3 avenue lamine, cité ezzahra, Sousse 4000
> >> >> Tunisia
> >> >> tel: +216 97 246 706 (+33640302046 jusqu'au 15/6)
> >> >> fax: +216 71 391 166
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > *PhD candidate in Computer Science
> >> > Address
> >> > 3 avenue lamine, cité ezzahra, Sousse 4000
> >> > Tunisia
> >> > tel: +216 97 246 706
> >> > fax: +216 71 391 166*
> >> >
> >> >        [[alternative HTML version deleted]]
> >> >
> >> >
> >> > ______________________________________________
> >> > R-help@r-project.org mailing list
> >> > https://stat.ethz.ch/mailman/listinfo/r-help
> >> > PLEASE do read the posting guide
> >> > http://www.R-project.org/posting-guide.html
> >> > and provide commented, minimal, self-contained, reproducible code.
> >> >
> >> >
> >>
> >> ______________________________________________
> >> R-help@r-project.org mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> >> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >
> >
> >
> > --
> > PhD candidate in Computer Science
> > Address
> > 3 avenue lamine, cité ezzahra, Sousse 4000
> > Tunisia
> > tel: +216 97 246 706 (+33640302046 jusqu'au 15/6)
> > fax: +216 71 391 166
> >
>



-- 
*PhD candidate in Computer Science
Address
3 avenue lamine, cité ezzahra, Sousse 4000
Tunisia
tel: +216 97 246 706
fax: +216 71 391 166*

	[[alternative HTML version deleted]]

