Thanks guys. I forgot to use the argument "zlim". It's solved.
2010/9/16 Jim Lemon <j...@bitwrit.com.au>
> On 09/16/2010 12:05 PM, rusers.sh wrote:
>
>> Hi all,
>> I want to put several figures in a one figure for easy comparison, so i
>> need to use the same methods to plot these figures. The following is an
>> example. I also list my method, but it does not work.
>> #Example data
>> x<- 1:10; y<- 1:10; z<- outer( x,y,"+");z2<- outer( x,y,"-")
>> #Quick view them
>> image.plot(x,y,z) #relatively larger value
>> image.plot(x,y,z2) #relatively small value
>> #define the same breaks and colors
>> brks<-quantile(c(as.vector(z),as.vector(z2)),na.rm=TRUE)
>> colsn<-length(brks)-1
>> cols<-gray((colsn:1)/colsn)
>> #I expect they use the same breaks and colors
>> par(mfrow=c(1,2))
>> image.plot(x,y,z,breaks=brks,col=cols)
>> image.plot(x,y,z2,breaks=brks,col=cols)
>> par(mfrow=c(1,1))
>> I think they really use the same breaks and colors, but you can see the
>> color legends are still different. One is 20-15-10-5, another is 5-0--5.
>> I hope they not only use the same breaks and colors, but also display
>> the
>> same color legends. How can i do it?
>>
>
> Hi Jane,
> The color.legend function in the plotrix package will do this - see the
> examples, especially those for the "barp" function.
>
> Jim
>
>
--
-----------------
Jane Chang
Queen's
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