gene_barplot: Plot mean gene expression as bar plot
In jacobheng/cellwrangler: Supplemental toolkit for single-cell RNAseq analysis

gene_barplot() plots the mean expression of a given gene as a bar plot with standard error bars.

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gene_barplot(genes, cds, group = "genotype", color = "genotype",
  facet_wrap = NULL, facet_genes = "cols", plot_trend = F,
  color_trend = "orange")

`genes`	a vector of gene name(s) to plot e.g. c("Actb", "Aldoa")
`cds`	a CellDataSet object e.g. used in the monocle package
`group`	column name in pData(cds) to group the bar plots by on the horizontal axis.
`color`	column name in pData(cds) to color the bar plots with.
`facet_wrap`	a column in pData(cds) to facet_wrap the plots with.
`facet_genes`	only used if facet_wrap is NULL and there are multiple genes being plotted; if set to "cols", will facet genes into columns; otherwise will facet genes into rows
`plot_trend`	logical;whether to plot a trend line across groups in plot(s).
`color_trend`	color to use for trend line.