mean.im {spatstat} | R Documentation |
Calculates the mean, median, range, sum, maximum or minimum of the pixel values in a pixel image.
## S3 method for class 'im' max(x, ...) ## S3 method for class 'im' min(x, ...) ## S3 method for class 'im' mean(x, ...) ## S3 method for class 'im' median(x, ...) ## S3 method for class 'im' range(x, ...) ## S3 method for class 'im' sum(x, ...)
x |
A pixel image (object of class |
... |
Arguments passed to |
These functions calculate the mean, median, range, sum, maximum
or minimum of the pixel values in the image
x
.
An object of class "im"
describes a pixel image. See im.object
)
for details of this class.
The function mean.im
is a method for the generic
function mean
for the class "im"
.
Similarly median.im
is a method for the generic
median
and range.im
is a method for range
.
If the image x
is logical-valued, the mean value of x
is
the fraction of pixels that have the value TRUE
. The median is
not defined.
If the image x
is factor-valued, then the mean of x
is the mean of the integer codes of the pixel values. The median and range
are not defined.
Any arguments in ...
are passed to the default method,
for example mean.default
.
In particular, using the argument trim
will compute the
trimmed mean, as explained in the help for mean.default
.
Other information about an image can be obtained using
summary.im
or quantile.im
.
A single number.
Adrian Baddeley Adrian.Baddeley@csiro.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz
mean
,
median
,
range
,
sum
,
mean.default
,
median.default
,
range.default
,
quantile.im
,
im.object
,
summary.im
.
X <- as.im(function(x,y) {x^2}, unit.square()) mean(X) median(X) range(X) mean(X, trim=0.05)