multiplot: Combine multiple ggplot objects into a single layout

In rtpcr: qPCR Data Analysis

Combine multiple ggplot objects into a single layout

Description

The multiplot function arranges multiple ggplot2 objects into a single plotting layout with a specified number of columns.

Usage

multiplot(..., cols = 1)

Arguments

...	One or more ggplot2 objects.
cols	Integer specifying the number of columns in the layout.

Details

Multiple ggplot2 objects can be provided either as separate arguments via .... The function uses the grid package to control the layout.

Value

A grid object displaying multiple plots arranged in the specified layout.

Author(s)

Pedro J. (adapted from https://gist.github.com/pedroj/ffe89c67282f82c1813d)

Examples

# Example using output from TTEST_DDCt
data1 <- read.csv(system.file("extdata", "data_ttest18genes.csv", package = "rtpcr"))
out <- TTEST_DDCt(
  data1,
  paired = FALSE,
  var.equal = TRUE,
  numberOfrefGenes = 1)
  
p1 <- plotFactor(out, 
  x_col = "gene",
  y_col = "log2FC", 
  Lower.se_col = "Lower.se.log2FC",
  Upper.se_col = "Upper.se.log2FC", 
  letters_col = "sig")
  
p2 <- plotFactor(out, 
  x_col = "gene",
  y_col = "RE", 
  Lower.se_col = "Lower.se.RE",
  Upper.se_col = "Upper.se.RE", 
  letters_col = "sig")
  
  

# Example using output from ANOVA_DCt
data2 <- read.csv(system.file("extdata", "data_1factor.csv", package = "rtpcr"))
out2 <- ANOVA_DCt(
  data2,
  numOfFactors = 1,
  numberOfrefGenes = 1,
  block = NULL)
  
df <- out2$relativeExpression

p3 <- plotFactor(
  df,
  x_col = "SA",
  y_col = "RE",
  Lower.se_col = "Lower.se.RE",
  Upper.se_col = "Upper.se.RE",
  letters_col = "sig",
  letters_d = 0.1,
  col_width = 0.7,
  err_width = 0.15,
  fill_colors = "skyblue",
  alpha = 1,
  base_size = 14)

# Combine plots into a single layout
multiplot(p1, p2, cols = 2)

multiplot(p1, p3, cols = 2)

rtpcr documentation built on Feb. 3, 2026, 9:09 a.m.