Creates a volcano plot with capped -log10(p-values) on the y-axis. Supports effect size threshold lines, feature annotations, and flexible color and shape aesthetics.
Usage
plot_volcano(
data,
x_var,
y_var,
color_var = NULL,
shape_var = NULL,
features = NULL,
sig_thr = NULL,
effect_thr = NULL,
title = NULL,
x_label = NULL,
y_label = NULL,
color_label = NULL,
shape_label = NULL,
log_cap = 5,
epsilon = 1e-15,
point_size = 1
)Arguments
- data
Data frame with variables to plot.
- x_var
String. Column name for x-axis (e.g., effect size).
- y_var
String. Column name for y-axis (p-values to transform).
- color_var
String. Column name mapped to point colors.
- shape_var
String. Column name mapped to point shapes.
- features
Optional vector. Feature names to annotate.
- sig_thr
Numeric. Significance threshold for horizontal line.
- effect_thr
Numeric. Effect size threshold for vertical lines.
- title
String. Plot title.
- x_label
String. Custom x-axis label.
- y_label
String. Custom y-axis label.
- color_label
String. Legend title for color.
- shape_label
String. Legend title for shape.
- log_cap
Numeric. Max -log10(p) to cap values. Default is 5.
- epsilon
Numeric. Small constant to avoid log10(0). Default 1e-15.
- point_size
Numeric. Size of points. Default is 1.