The R Project SVN R

Rev

Rev 68948 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 68948 Rev 85904
Line 13... Line 13...
13 
\usage{rock}
 13 
\usage{rock}
14 
\format{
 14 
\format{
15 
    A data frame with 48 rows and 4 numeric columns.
 15 
    A data frame with 48 rows and 4 numeric columns.
16 
 
 16 
 
17 
    \tabular{rll}{
 17 
    \tabular{rll}{
18 
        [,1] \tab area  \tab area of pores space, in pixels
 18 
        [,1] \tab \code{area}  \tab area of pores space, in pixels
19 
        out of 256 by 256 \cr
 19 
        out of 256 by 256 \cr
20 
        [,2] \tab peri  \tab perimeter in pixels \cr
 20 
        [,2] \tab \code{peri}  \tab perimeter in pixels \cr
21 
        [,3] \tab shape \tab perimeter/sqrt(area) \cr
 21 
        [,3] \tab \code{shape} \tab perimeter/sqrt(area) \cr
22 
        [,4] \tab perm  \tab permeability in milli-Darcies
 22 
        [,4] \tab \code{perm}  \tab permeability in millidarcies
23 
    }
 23 
    }
24 
}
 24 
}
25 
\details{
 25 
\details{
26 
    Twelve core samples from petroleum reservoirs were sampled by 4
 26 
    Twelve core samples from petroleum reservoirs were sampled by 4
27 
    cross-sections.  Each core sample was measured for permeability, and
 27 
    cross-sections.  Each core sample was measured for permeability, and