How can I display a heatmap.2 with a column dendrogram without reordering
neither column or row?

library(vegan)
dissimilaritymatrix<-data.matrix(vegdist(step3,method="bray"))
library(gplots)
heatmap<-heatmap.2(dissimilaritymatrix,dendrogram="column",Colv=T,
Rowv=F,key=TRUE, symkey=FALSE, density.info="none", trace="none",col =
cm.colors(256))


Please advice!

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