xEnrichDAGplot | R Documentation

## Function to visualise enrichment results using a direct acyclic graph (DAG)

### Description

`xEnrichDAGplot` is supposed to visualise enrichment results using a direct acyclic graph (DAG) with node colorings. By default, significant terms (of interest) are highlighted by box-shaped nodes, the others by ellipse nodes. It returns an object of class 'Ragraph'.

### Usage

    xEnrichDAGplot(eTerm, top_num = 10, ig = NULL, displayBy = c("fc",
    "adjp", "fdr", "zscore", "pvalue"), path.mode = c("all_paths",
    "shortest_paths", "all_shortest_paths"), height = 7, width = 7,
    margin = rep(0.1, 4), colormap = c("yr", "bwr", "jet", "gbr", "wyr",
    "br", "rainbow", "wb", "lightyellow-orange"), ncolors = 40,
    zlim = NULL, colorbar = T, colorbar.fraction = 0.1, newpage = T,
    layout.orientation = c("top_bottom", "left_right", "bottom_top",
    "right_left"), node.info = c("none", "term_id", "term_name", "both",
    "full_term_name"), wrap.width = NULL, graph.node.attrs = NULL,
    graph.edge.attrs = NULL, node.attrs = NULL)

### Arguments

`eTerm` | an object of class "eTerm"
`top_num` | the number of the top terms (sorted according to FDR or adjusted p-values). If it is 'auto', only the significant terms (FDR < 0.05) will be displayed
`ig` | the igraph object. If provided, only those terms within it will be visualised. By default, it is NULL meaning no surch restriction
`displayBy` | which statistics will be used for displaying. It can be "fc" for enrichment fold change (by default), "adjp" or "fdr" for adjusted p value (or FDR), "pvalue" for p value, "zscore" for enrichment z-score
`path.mode` | the mode of paths induced by nodes in query. It can be "all_paths" for all possible paths to the root, "shortest_paths" for only one path to the root (for each node in query), "all_shortest_paths" for all shortest paths to the root (i.e. for each node, find all shortest paths with the equal lengths)
`height` | a numeric value specifying the height of device
`width` | a numeric value specifying the width of device
`margin` | margins as units of length 4 or 1
`colormap` | short name for the colormap. It can be one of "jet" (jet colormap), "bwr" (blue-white-red colormap), "gbr" (green-black-red colormap), "wyr" (white-yellow-red colormap), "br" (black-red colormap), "yr" (yellow-red colormap), "wb" (white-black colormap), and "rainbow" (rainbow colormap, that is, red-yellow-green-cyan-blue-magenta). Alternatively, any hyphen-separated HTML color names, e.g. "lightyellow-orange" (by default), "blue-black-yellow", "royalblue-white-sandybrown", "darkgreen-white-darkviolet". A list of standard color names can be found in http://html-color-codes.info/color-names
`ncolors` | the number of colors specified over the colormap
`zlim` | the minimum and maximum z/data values for which colors should be plotted, defaulting to the range of the finite values of z. Each of the given colors will be used to color an equispaced interval of this range. The midpoints of the intervals cover the range, so that values just outside the range will be plotted
`colorbar` | logical to indicate whether to append a colorbar. If data is null, it always sets to false
`colorbar.fraction` | the relative fraction of colorbar block against the device size
`newpage` | logical to indicate whether to open a new page. By default, it sets to true for opening a new page
`layout.orientation` | the orientation of the DAG layout. It can be one of "left_right" for the left-right layout (viewed from the DAG root point), "top_bottom" for the top-bottom layout, "bottom_top" for the bottom-top layout, and "right_left" for the right-left layout
`node.info` | tells the ontology term information used to label nodes. It can be one of "none" for no node labeling, "term_id" for using Term ID, "term_name" for using Term Name (the first 15 characters), "both" for using both of Term ID and Name (the first 15 characters), and "full_term_name" for using the full Term Name
`wrap.width` | a positive integer specifying wrap width of Term Name
`graph.node.attrs` | a list of global node attributes. These node attributes will be changed globally. See 'Note' below for details on the attributes
`graph.edge.attrs` | a list of global edge attributes. These edge attributes will be changed globally. See 'Note' below for details on the attributes
`node.attrs` | a list of local edge attributes. These node attributes will be changed locally; as such, for each attribute, the input value must be a named vector (i.e. using Term ID as names). See 'Note' below for details on the attributes

### Value

An object of class 'Ragraph'

### Note

A list of global node attributes used in "graph.node.attrs":

- "shape": the shape of the node: "circle", "rectangle", "rect", "box" and "ellipse"

- "fixedsize": the logical to use only width and height attributes. By default, it sets to true for not expanding for the width of the label

- "fillcolor": the background color of the node

- "color": the color for the node, corresponding to the outside edge of the node

- "fontcolor": the color for the node text/labelings

- "fontsize": the font size for the node text/labelings

- "height": the height (in inches) of the node: 0.5 by default

- "width": the width (in inches) of the node: 0.75 by default

- "style": the line style for the node: "solid", "dashed", "dotted", "invis" and "bold"

A list of global edge attributes used in "graph.edge.attrs":

- "color": the color of the edge: gray by default

- "weight": the weight of the edge: 1 by default

- "style": the line style for the edge: "solid", "dashed", "dotted", "invis" and "bold"

A list of local node attributes used in "node.attrs" (only those named Term IDs will be changed locally!):

- "label": a named vector specifying the node text/labelings

- "shape": a named vector specifying the shape of the node: "circle", "rectangle", "rect", "box" and "ellipse"

- "fixedsize": a named vector specifying whether it sets to true for not expanding for the width of the label

- "fillcolor": a named vector specifying the background color of the node

- "color": a named vector specifying the color for the node, corresponding to the outside edge of the node

- "fontcolor": a named vector specifying the color for the node text/labelings

- "fontsize": a named vector specifying the font size for the node text/labelings

- "height": a named vector specifying the height (in inches) of the node: 0.5 by default

- "width": a named vector specifying the width (in inches) of the node: 0.75 by default

- "style": a named vector specifying the line style for the node: "solid", "dashed", "dotted", "invis" and "bold"

### See Also

`xEnricherGenes`, `xEnricherSNPs`, `xEnrichViewer`

### Examples

    ## Not run:
    # Load the XGR package and specify the location of built-in data
    library(XGR)
    RData.location <- "http://galahad.well.ox.ac.uk/bigdata/"

    # 1) load eQTL mapping results: cis-eQTLs significantly induced by IFN
    cis <- xRDataLoader(RData.customised='JKscience_TS2A',
    RData.location=RData.location)
    ind <- which(cis$IFN_t > 0 & cis$IFN_fdr < 0.05)
    df_cis <- cis[ind, c('variant','Symbol','IFN_t','IFN_fdr')]
    data <- df_cis$variant

    # 2) Enrichment analysis using Experimental Factor Ontology (EFO)
    # Considering LD SNPs and respecting ontology tree
    eTerm <- xEnricherSNPs(data, ontology="EF", include.LD="EUR",
    LD.r2=0.8, ontology.algorithm="lea", RData.location=RData.location)

    # 3) DAG plot of enrichment results
    agDAG <- xEnrichDAGplot(eTerm, top_num="auto", displayBy="fc",
    node.info=c("full_term_name"))
    ## modify node labels
    xEnrichDAGplot(eTerm, top_num="auto", displayBy="fc",
    node.info=c("full_term_name"),
    graph.node.attrs=list(fontsize=25,fontcolor="blue",color="transparent"))
    ## modify node shapes
    xEnrichDAGplot(eTerm, top_num="auto", displayBy="fc",
    node.info=c("full_term_name"),
    graph.node.attrs=list(fixedsize=FALSE,shape=c("ellipse","box","circle","plaintext")[2]))
    ## further modify edge color
    xEnrichDAGplot(eTerm, top_num="auto", displayBy="fc",
    node.info=c("full_term_name"), graph.node.attrs=list(fontsize=25),
    graph.edge.attrs=list(color="black"))

    # 4) hide labels for ellipse nodes
    library(Rgraphviz)
    name_nodes <- sapply(AgNode(agDAG), name)
    shape_nodes <- sapply(AgNode(agDAG), shape)
    names(shape_nodes) <- name_nodes
    ind <- which(shape_nodes=='ellipse')
    label_nodes <- rep('', length(ind))
    names(label_nodes) <- name_nodes[ind]
    xEnrichDAGplot(eTerm, top_num="auto", displayBy="fc",
    node.info=c("full_term_name"), node.attrs=list(label=label_nodes,
    shape=shape_nodes))

    ## End(Not run)