ggheatmap<-function(df, x=NULL, y=NULL, value=NULL, grouping="mean"){
  if (is.null(x)){x=colnames(df)[1]}
  if (is.null(y)){y=colnames(df)[2]}
  if (is.null(value)){value=colnames(df)[3]}

  df<-rename(df, "VarX"=x, "VarY"=y, "Value"=value)

  if (grouping == "mean"){
    df<-df %>% group_by(VarX,VarY) %>% summarise(Value=mean(Value))
  }
  if (grouping == "median"){
    df<-df %>% group_by(VarX,VarY) %>% summarise(Value=median(Value))
  }

  order<-clustsort(df %>% spread(VarY,Value) %>% as.data.frame)

  df %>%
    ggplot(aes(VarX, VarY, fill=Value))+
    scale_x_discrete(limits=order$x)+
    scale_y_discrete(limits=order$y)+
    labs(x=x, y=y)+
    theme_heatmap()
}