[R-sig-Geo] question about image function

[Clint Bowman]

When using png in a loop, especially one where the loop index is an 
integer, I usually make use of the "%02d" in the file name, e.g., 
png("pred_%02d_a.png",...)

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On Wed, 6 Mar 2013, Michael Sumner wrote:

> I don't see filename defined, or any packages required. Is it the png files
> that are a problem or the 'kmlsetup' output? (whatever that is)
>
> See the animation package for extremely simplifed image frame creation btw
>
> On Wednesday, March 6, 2013, Hodgess, Erin wrote:
>
>> Hello again!
>>
>> I'm running into a problem with the image function within a loop.  When I
>> put it to the screen, it works fine, but when I put it to a PNG file, the
>> picture doesn't change.
>>
>> Here is the code:
>>
>> for(i in 1:11) {
>> j1 <- (i-1)*n2 + 1
>> j2 <- i*n2
>>
>>  predx <- data.frame(pred=kr3$var1.pred[j1:j2],lon=kr3 at sp
>> @coords[,1],lat=kr3 at sp@coords[,2])
>>
>>  coordinates(predx) <- ~lon+lat
>>  proj4string(predx) <- proj4string(kr3)
>>  predx.wgs84 <- spTransform(predx,CRS("+proj=longlat +datum=WGS84"))
>>  llSPix <- as(llSGDF, "SpatialPixelsDataFrame")
>>  (st <- system.time(llSPix$pred <- idw(pred ~ 1,
>>  loc=predx.wgs84,newdata = llSPix, nmax = 16)$var1.pred))
>>  cat("stuff",i,"\n")
>> f1 <- paste("pred",i,"a.png",sep="")
>> #Works fine
>> image(llSPix,"pred",col=bpy.colors(),main=f1)
>>
>>
>>  assign("file1",f1)
>>  cat("filen",file1,"\n")
>>  png(filename = file1, width = GRD.wgs84$width,
>>  height = GRD.wgs84$height,bg="transparent")
>>  par(mar = c(0, 0, 0, 0), xaxs = "i", yaxs = "i")
>>  image(llSPix, "pred", col = bpy.colors())
>>  dev.off()
>>  kmlsetup(obj = GRD.wgs84, kmlfile =filename,
>>  imagefile = file1, name =as.character(2000+i))
>>
>> }
>>
>> Has anyone run into this before, please?
>>
>> Thanks,
>> Erin
>>
>>
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>>
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>
>
> -- 
> Michael Sumner
> Hobart, Australia
> e-mail: mdsumner at gmail.com
>
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>
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