Differences

This shows you the differences between two versions of the page.

--- kvalobs:kvoss:system:qc2:8hdk376snf09zj37dk82s92:ncdf [2009-06-20 22:40:08]
paule
+++ kvalobs:kvoss:system:qc2:8hdk376snf09zj37dk82s92:ncdf [2022-05-31 09:29:32] (current)
@@ Line 15: / Line 15: @@
   $ R CMD INSTALL ncdf
   $ history
+  ...
+  ...
+  # there are perhaps even easier ways to do this:
+  $ install.packages("gplots", dependencies = TRUE)
+  # no source was linked ... but the mirror choose automatically opens
+  # and one just selects a site and the install happens!
+  ...
+  $
 </code>
@@ Line 21: / Line 31: @@
 <code>
   $ R
-  > library(ncdf)
+   Method='unspecified'
-  > nd = open.ncdf("interpolations.nc")
+   Shortname='outfile'
-  > x=get.var.ncdf(nd,"Original")
+   library(ncdf)
-  > y=get.var.ncdf(nd,"Interpolations")
+   nd = open.ncdf("interpolations.nc")
-  > v <- array(x, length(x))
+   x=get.var.ncdf(nd,"Original")
-  > w <- array(y, length(y))
+   y=get.var.ncdf(nd,"Interpolations")
-  > xx=x[!is.na(x) & x>=0 & x < 100]
+   x[x==-1]=0
-  > yy=y[!is.na(x) & x>=0 & x < 100]
+   v <- array(x, length(x))
-  > yyy=yy[!is.na(xx) & xx>=0 & xx < 100]
+   w <- array(y, length(y))
-  > plot(xxx,yyy)
+   xx=x[!is.na(x) & x>=0 & x < 100]
-  > cor(xxx,yyy)
+   yy=y[!is.na(x) & x>=0 & x < 100]
+   yyy=yy[!is.na(yy) & yy>=0 & yy < 100]
+   xxx=xx[!is.na(yy) & yy>=0 & yy < 100]
+   jpeg(filename=paste(Shortname,'jpg',sep='.'))
+   plot(xxx,yyy,pch=46,xlab='Original Value',ylab='Interpoltion',main=Method)
+   XC=cor(xxx,yyy)
+   ff <- lm(xxx ~ yyy)
+   ff$coefficients[1]
+   ff$coefficients[2]
+   z=ff$coefficients[1]*xxx + ff$coefficients[2]
+   #lines(xxx,z)
+   text(0,95,"Linear Regression",pos=4)
+   text(0,90,paste("Gradient =",format(ff$coefficients[1],digits=5)),pos=4)
+   text(0,85,paste("Intercept =",format(ff$coefficients[2],digits=5)),pos=4)
+   text(0,75,paste("Correlation coefficient =",format(XC,digits=5)),pos=4)
+   dev.off()
-  > ff <- lm(yyy ~ xxx)
-  > z=ff$coefficients[1]*xxx + ff$coefficients[2]
 </code>
+Alternatively, place the code in a file and run from the command line:
+<code>
+ $ Rscript plot_netcdf.R "Test Plot" OUTPUT
+</code>
+that will produce the file OUTPUT.jpg with the plot title "Test Plot".
+  * {{kvalobs:kvoss:system:qc2:8hdk376snf09zj37dk82s92:plot_netcdf.pdf|plot_netcdf.R}}