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Update example with origin and legend
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table.shingle<-function(..., as.data.frame=F) { | |
dots<-list(...) | |
stopifnot(all(sapply(dots, class) %in% c("shingle","factor"))) | |
stopifnot(length(unique(sapply(dots, length)))==1) | |
dims<-sapply(dots, nlevels) | |
varnames<-tail(lapply(match.call(), deparse),-1) | |
varnames["as.data.frame"] <- NULL | |
res<-array(0, dims, `names<-`(lapply(dots, function(x) as.vector(sapply(levels(x), paste, collapse=":"))), varnames)) | |
isinlevel<-function(z, ints) { | |
if(is.factor(z)) { | |
as.numeric(z) | |
} else { | |
which(sapply(ints, function(y) {y[1]<=z & z<=y[2]})) | |
} | |
} | |
for(i in seq_along(dots[[1]])) { | |
dx<-vector("list", length(dots)) | |
for(h in seq_along(dots)) { | |
dx[[h]]<-isinlevel(dots[[h]][i], levels(dots[[h]])) | |
} | |
idx<-as.matrix(do.call("expand.grid", dx)) | |
res[idx]<-res[idx]+1 | |
} | |
res<-as.table(res) | |
if(as.data.frame) { | |
#attempts to preserve the shingles | |
shingleunoverlap<-function(x) { | |
n<-nlevels(x)*2 | |
ints<-do.call(rbind, levels(x)) | |
return((ints[c(1, seq(n/2+1, n-1))] + ints[c(seq(2, n/2),n)])/2); | |
} | |
res<-base::as.data.frame(res) | |
for(i in seq_along(dots)) { | |
if(class(dots[[i]])=="shingle") { | |
nvals<-shingleunoverlap(dots[[i]])[as.numeric(res[[i]])] | |
res[[i]]<-nvals | |
attr(res[[i]], "levels")<-attr(dots[[i]], "levels") | |
attr(res[[i]], "class")<-"shingle" | |
} | |
} | |
} | |
res; | |
} |
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require(lattice) | |
x<-equal.count(rnorm(50)) | |
y<-factor(sample(c("M","F"), 50, replace=T)) | |
z<-equal.count(rnorm(50)) | |
a<-table.shingle(x,y,z);a | |
b<-table.shingle(x,y,z, as.data.frame=T);b | |
useOuterStrips(barchart(~Freq|x+z,b, groups=y, origin=0, auto.key=TRUE)) |
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