tidyHeatmap

Citation

Mangiola et al., (2020). tidyHeatmap: an R package for modular heatmap production based on tidy principles. Journal of Open Source Software, 5(52), 2472, https://doi.org/10.21105/joss.02472

Please have a look also to

• tidygate for adding custom gate information to your tibble
• tidySingleCellExperiment for tidy manipulation of Seurat objects
• tidyseurat for tidy manipulation of Seurat objects
• tidybulk for tidy high-level data analysis and manipulation
• tidySummarizedExperiment for heatmaps produced with tidy principles

website: stemangiola.github.io/tidyHeatmap

tidyHeatmap is a package that introduces tidy principles to the creation of information-rich heatmaps. This package uses ComplexHeatmap as graphical engine.

Advantages:

• Modular annotation with just specifying column names
• Custom grouping of rows is easy to specify providing a grouped tbl. For example df |> group_by(...)
• Labels size adjusted by row and column total number
• Default use of Brewer and Viridis palettes

Functions/utilities available

Function	Description
heatmap	Plots base heatmap
add_tile	Adds tile annotation to the heatmap
add_point	Adds point annotation to the heatmap
add_bar	Adds bar annotation to the heatmap
add_line	Adds line annotation to the heatmap
layer_point	Adds layer of symbols on top of the heatmap
layer_square	Adds layer of symbols on top of the heatmap
layer_diamond	Adds layer of symbols on top of the heatmap
layer_arrow_up	Adds layer of symbols on top of the heatmap
layer_arrow_down	Add layer of symbols on top of the heatmap
split_rows	Splits the rows based on the dendogram
split_columns	Splits the columns based on the dendogram
save_pdf	Saves the PDF of the heatmap

Installation

To install the most up-to-date version

devtools::install_github("stemangiola/tidyHeatmap")

To install the most stable version (however please keep in mind that this package is under a maturing lifecycle stage)

install.packages("tidyHeatmap")

Contribution

If you want to contribute to the software, report issues or problems with the software or seek support please open an issue here

Input data frame

The heatmaps visualise a multi-element, multi-feature dataset, annotated with independent variables. Each observation is a element-feature pair (e.g., person-physical characteristics).

element	feature	value	independent_variables
chr or fctr	chr or fctr	numeric	…

Let’s transform the mtcars dataset into a tidy “element-feature-independent variables” data frame. Where the independent variables in this case are ‘hp’ and ‘vs’.

mtcars_tidy <- 
    mtcars |> 
    as_tibble(rownames="Car name") |> 
    
    # Scale
    mutate_at(vars(-`Car name`, -hp, -vs), scale) |>
    
    # tidyfy
    pivot_longer(cols = -c(`Car name`, hp, vs), names_to = "Property", values_to = "Value")

mtcars_tidy

## # A tibble: 288 x 5
##    `Car name`       hp    vs Property Value[,1]
##    <chr>         <dbl> <dbl> <chr>        <dbl>
##  1 Mazda RX4       110     0 mpg          0.151
##  2 Mazda RX4       110     0 cyl         -0.105
##  3 Mazda RX4       110     0 disp        -0.571
##  4 Mazda RX4       110     0 drat         0.568
##  5 Mazda RX4       110     0 wt          -0.610
##  6 Mazda RX4       110     0 qsec        -0.777
##  7 Mazda RX4       110     0 am           1.19 
##  8 Mazda RX4       110     0 gear         0.424
##  9 Mazda RX4       110     0 carb         0.735
## 10 Mazda RX4 Wag   110     0 mpg          0.151
## # … with 278 more rows

Plotting

For plotting, you simply pipe the input data frame into heatmap, specifying:

• The rows, cols relative column names (mandatory)
• The value column name (mandatory)
• The annotations column name(s)

mtcars

mtcars_heatmap <- 
    mtcars_tidy |> 
    heatmap(`Car name`, Property, Value ) |>
    add_tile(hp)

## tidyHeatmap says: (once per session) from release 1.2.3 the grouping labels have white background by default. To add color for one-ay grouping specify palette_grouping = list(c("red", "blue"))

mtcars_heatmap

Saving

mtcars_heatmap |> save_pdf("mtcars_heatmap.pdf")

Grouping and splitting

We can easily group the data (one group per dimension maximum, at the moment only the vertical dimension is supported) with dplyr, and the heatmap will be grouped accordingly

mtcars_tidy |> 
    group_by(vs) |>
    heatmap(`Car name`, Property, Value ) |>
    add_tile(hp)

We can provide colour palettes to groupings

mtcars_tidy |> 
    group_by(vs) |>
    heatmap(
        `Car name`, Property, Value ,
        palette_grouping = list(c("#66C2A5", "#FC8D62"))
    ) |>
    add_tile(hp)

We can split based on the cladogram

mtcars_tidy |> 
    heatmap(`Car name`, Property, Value ) |>
    split_rows(2) |>
    split_columns(2)

We can Split on kmean clustering (using ComplexHeatmap options, it is stokastic)

mtcars_tidy |> 
    heatmap(
        `Car name`, Property, Value ,
        row_km = 2,
        column_km = 2
    ) 

Custom palettes

We can easily use custom palette, using strings, hexadecimal color character vector,

mtcars_tidy |> 
    heatmap(
        `Car name`, 
        Property, 
        Value,
        palette_value = c("red", "white", "blue")
    )

A better-looking blue-to-red palette

mtcars_tidy |> 
    heatmap(
        `Car name`, 
        Property, 
        Value,
        palette_value = circlize::colorRamp2(
            seq(-2, 2, length.out = 11), 
            RColorBrewer::brewer.pal(11, "RdBu")
        )
    )

Or a grid::colorRamp2 function for higher flexibility

mtcars_tidy |> 
    heatmap(
        `Car name`, 
        Property, 
        Value,
        palette_value = circlize::colorRamp2(c(-2, -1, 0, 1, 2), viridis::magma(5))
    )

Multiple groupings and annotations

tidyHeatmap::pasilla |>
    group_by(location, type) |>
    heatmap(
        .column = sample,
        .row = symbol,
        .value = `count normalised adjusted`
    ) |>
    add_tile(condition) |>
    add_tile(activation)

Remove legends, adding aesthetics to annotations in a modular fashion, using ComplexHeatmap arguments

tidyHeatmap::pasilla |>
    group_by(location, type) |>
    heatmap(
        .column = sample,
        .row = symbol,
        .value = `count normalised adjusted`,
        show_heatmap_legend = FALSE
    ) |>
    add_tile(condition, show_legend = FALSE) |>
    add_tile(activation, show_legend = FALSE)

Annotation types

This feature requires >= 0.99.20 version

“tile” (default), “point”, “bar” and “line” are available

# Create some more data points
pasilla_plus <- 
    tidyHeatmap::pasilla |>
    dplyr::mutate(act = activation) |> 
    tidyr::nest(data = -sample) |>
    dplyr::mutate(size = rnorm(n(), 4,0.5)) |>
    dplyr::mutate(age = runif(n(), 50, 200)) |>
    tidyr::unnest(data) 

# Plot
pasilla_plus |>
    heatmap(
        .column = sample,
        .row = symbol,
        .value = `count normalised adjusted`
    ) |>
    add_tile(condition) |>
    add_point(activation) |>
    add_tile(act) |>
    add_bar(size) |>
    add_line(age)

Layer symbol

Add a layer on top of the heatmap

tidyHeatmap::pasilla |>
    
    # filter
    filter(symbol %in% head(unique(tidyHeatmap::pasilla$symbol), n = 10)) |>
    
    heatmap(
        .column = sample,
        .row = symbol,
        .value = `count normalised adjusted`
    ) |> 
    layer_point(
        `count normalised adjusted log` > 6 & sample == "untreated3" 
    )

ComplexHeatmap further styling

Add cell borders

mtcars_tidy |> 
    heatmap(
        `Car name`, Property, Value, 
        rect_gp = grid::gpar(col = "#161616", lwd = 0.5)
    ) 

Drop row clustering

mtcars_tidy |> 
    heatmap(
        `Car name`, Property, Value, 
        cluster_rows = FALSE
    ) 

Reorder rows elements

library(forcats)
mtcars_tidy |> 
    mutate(`Car name` = fct_reorder(`Car name`, `Car name`, .desc = TRUE)) %>% 
    heatmap(
        `Car name`, Property, Value, 
        cluster_rows = FALSE
    )