On Fri, 2011-01-07 at 12:17 -0800, paogeomat wrote:
> I want to analize some points location using the ppp, but i have this
> problem:
>
> Datos=read.table("puntos_texto.txt",dec=".",sep="\t",header=T)
> > summary(Datos)
> id y x
> Min. : 1.0 Min. :1013581 Min. :1177842
> 1st Qu.: 821.2 1st Qu.:1014442 1st Qu.:1179658
> Median :1641.5 Median :1014455 Median :1179670
> Mean :1641.8 Mean :1014465 Mean :1179652
> 3rd Qu.:2462.8 3rd Qu.:1014473 3rd Qu.:1179680
> Max. :3283.0 Max. :1015575 Max. :1180213
> > danta=ppp(Datos$x,Datos$y,c(min(Datos$x)1177842,max(Datos$x)1180213),c(min(Datos$y)1013581,max(Datos$y)1015575))
> Error: inesperado constante numérica en
> "danta=ppp(Datos$x,Datos$y,c(min(Datos$x)1177842"
> > danta=ppp(Datos$x,Datos$y,c(min(Datos$x)"1177842",max(Datos$x)"1180213"),c(min(Datos$y)"1013581",max(Datos$y)"1015575"))
> Error: inesperado string constante en
> "danta=ppp(Datos$x,Datos$y,c(min(Datos$x)"1177842""
>
Space you code out! The it is easy to spot what is wrong:
danta = ppp(Datos$x, Datos$y, c(min(Datos$x)1177842, max(Datos
$x)1180213), c(min(Datos$y)1013581, max(Datos$y)1015575))
You have lots of the following:
c(min(Datos$y)1013581, max(Datos$y)1015575)
^^^ ^^^
you can't do this! Why are you including the numbers here? These are the
min and max values, so either use c(1177842, 1180213), or c(min(x),
max(x)), or range(x), but not a combination of the numbers and the
function output. Wouldn't this:
c(min(Datos$y), max(Datos$y))
or even
range(Datos$y)
be better?
Also, if we drop the syntax errors for the numbers you keep typing in,
you could write this more cleanly by using `with()`:
danta <- with(Datos, ppp(x, y, c(min(x), max(x)), c(min(y), max(y))))
or using range
danta <- with(Datos, ppp(x, y, range(x), range(y)))
Those two are far easier to read than your code.
HTH
G
--
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Dr. Gavin Simpson [t] +44 (0)20 7679 0522
ECRC, UCL Geography, [f] +44 (0)20 7679 0565
Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk
Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/
UK. WC1E 6BT. [w] http://www.freshwaters.org.uk
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