Make mirror plot from peak table. — mirror

Plots chromatograms as a mirror plot.

Usage

mirror_plot(
  x,
  chrom_list,
  lambdas = NULL,
  var,
  subset = NULL,
  print_legend = TRUE,
  legend_txt = NULL,
  legend_pos = "topright",
  legend_size = 1,
  mirror = TRUE,
  xlim = NULL,
  ylim = NULL,
  ...
)

Arguments

x: The peak table (output from get_peaktable function).
chrom_list: A list of chromatograms in matrix format (timepoints x wavelengths). If no argument is provided here, the function will try to find the chrom_list object used to create the peak_table.
lambdas: The wavelength you wish to plot the traces at.
var: Variable to index chromatograms.
subset: Character vector specifying levels to use (if more than 2 levels are present in var).
print_legend: Logical. Whether to print legend. Defaults to TRUE.
legend_txt: Character vector containing labels for legend.
legend_pos: Legend position.
legend_size: Legend size (cex argument). Default is 1.
mirror: Logical. Whether to plot as mirror or stacked plots. Defaults to TRUE.
xlim: Numerical vector specifying limits for x axis.
ylim: Numerical vector specifying limits for y axis.
...: Additional arguments to matplot function.

Value

No return value, called for side effects.

Details

Can be used to confirm the identity of a peak or check that a particular column in the peak table represents a single compound. Can also be used to create simple box-plots to examine the distribution of a peak with respect to variables defined in sample metadata.

Side effects

If mirror_plot is TRUE, plots a mirror plot comparing two treatments defined by var and subset (if more than two factors are present in var). Otherwise, if mirror_plot is FALSE, the treatments are plotted in two separate panes.

Author

Ethan Bass

Examples

data(Sa_warp)
data(pk_tab)
path <- system.file("extdata", "Sa_metadata.csv", package = "chromatographR")
meta <- read.csv(path)
pk_tab <- attach_metadata(peak_table = pk_tab, metadata = meta, column="vial")
mirror_plot(pk_tab,lambdas=c("210","260"), var="trt", mirror=TRUE, col=c("green","blue"))