It seems to me that gap::mhtplot needs a fix. You might want to contact the maintainer (cc'd).
In the meantime, you should be able to place an object ylim in your workspace before calling the function: ylim <- c(0, 10) mhtplot(test, ylim = c(0, 10)) Of course, you could also just fixt the function (it's short and the fix is easy). -Peter Ehlers On 2010-06-23 8:47, vaneet wrote:
Hello all, I am trying to make a genome association plot for p-values related to SNPs and was fortunate to find that R contains a package that produces Manhattan plots which is what's preferred for my current project. The function mhtplot() is found in the 'gap' package which I installed in R 2.11.1 on Windows. I thought I'd test out the function first with the examples they give in the documentation: # foo example test<- matrix(c(1,1,4,1,1,6,1,10,3,2,1,5,2,2,6,2,4,8),byrow=TRUE,6) mhtplot(test) mhtplot(test,logscale=F) # fake example with Affy500k data affy<-c(40220, 41400, 33801, 32334, 32056, 31470, 25835, 27457, 22864, 28501, 26273, 24954, 19188, 15721, 14356, 15309, 11281, 14881, 6399, 12400, 7125, 6207) CM<- cumsum(affy) n.markers<- sum(affy) n.chr<- length(affy) test<- data.frame(chr=rep(1:n.chr,affy),pos=1:n.markers,p=runif(n.markers)) # to reduce size of the plot # bitmap("mhtplot.bmp",res=72*5) oldpar<- par() par(las="2",cex=0.6) colors<- rep(c("blue","green"),11) mhtplot(test,colors=colors,pch=19,bg=colors) title("A simulated example according to EPIC-Norfolk QCed SNPs") When I run either of the examples the following results: Error in mhtplot(........) : object 'ylim' not found Even though I'm not sure why it would require this parameter, when I tried to fill in the parameter (ylim = c(0,10)) the same error results. I am not sure how to get around this. Vaneet
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