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#' Visualize the distribution difference of samples after Molecule Identifier dimension reduction analysis
#'
#' NOTE: the dataset must be dense matrix in UCSC Xena data hubs.
#'
#'
#' @param dataset the dataset to obtain identifiers.
#' @param ids the molecule identifiers.
#' @param grp_df When `dataset` and `id` are all not `NULL`, it should be a `data.frame` with 2 columns.
#' - The first column refers to sample ID.
#' - The second column refers to groups indicated in axis X.
#' @param samples default is `NULL`, can be common sample names for two datasets.
#' @param return.data whether to reture the raw meta/matrix data (list) instead of plot
#' @param DR_method the dimension reduction method
#' @param add_margin the marginal plot (NULL, "density", "boxplot")
#' @param palette the color setting of RColorBrewer
#'
#' @return a `ggplot` object.
#' @export
#'
#' @examples
#' \donttest{
#' library(UCSCXenaTools)
#' expr_dataset <- "TCGA.LUAD.sampleMap/HiSeqV2_percentile"
#' ids = c("TP53", "KRAS", "PTEN", "MDM2", "CDKN1A")
#'
#' cli_dataset <- "TCGA.LUAD.sampleMap/LUAD_clinicalMatrix"
#' cli_df <- XenaGenerate(
#' subset = XenaDatasets == cli_dataset
#' ) %>%
#' XenaQuery() %>%
#' XenaDownload() %>%
#' XenaPrepare()
#' grp_df = cli_df[, c("sampleID", "gender")]
#' vis_identifier_dim_dist(expr_dataset, ids, grp_df, DR_method="PCA")
#' }
#' @export
vis_identifier_dim_dist = function(dataset = NULL, ids = NULL, grp_df, samples = NULL,
return.data = FALSE,
DR_method = c("PCA", "UMAP", "tSNE"), add_margin = NULL,
palette = "Set1"){
stopifnot(ncol(grp_df) > 1)
DR_method <- match.arg(DR_method)
colnames(grp_df)[1] <- "sample"
if (!is.null(dataset) && !is.null(ids)) {
df <- tryCatch(
{
purrr::map(ids, function(x) {
message("Querying data of identifier ", x, " from dataset ", dataset, " for DR")
data <- if (dataset == "custom_feature_dataset") query_custom_feature_value(x) else
query_molecule_value(dataset, x)
data <- dplyr::tibble(
sample = names(data),
y = as.numeric(data)
)
colnames(data)[2] <- x
data
}) %>%
purrr::reduce(dplyr::full_join, by = "sample")
},
error = function(e) {
rlang::inform("access data failed, the message is provided below")
rlang::warn(conditionMessage(e))
NULL
}
)
if (is.null(df)) return(NULL)
df <- dplyr::inner_join(grp_df, df, by = "sample")
} else {
message("Directly use 'grp_df' for comparison analysis.")
df <- grp_df
ids = colnames(grp_df)[-1:-2]
}
if (!is.null(samples)) {
df <- dplyr::filter(df, .data$sample %in% samples)
}
ids_NAN <- colnames(df[, ids])[apply(df[, ids], 2, function(x) all(is.na(x)))]
ids_SD0 <- colnames(df[, ids])[apply(df[, ids], 2, function(x) stats::sd(x) == 0)] %>% na.omit()
ids_OK <- setdiff(ids, c(ids_NAN, ids_SD0))
if (length(ids_OK) < 3) {
stop("The number of valid ids is less than three. Please inspect the input ids and data_type(?query_pancan_value)")
}
if (return.data) {
return(list(meta = grp_df, exp = df))
}
if (DR_method == "PCA") {
pca_obj <- prcomp(df[, ids_OK], center = TRUE, scale = TRUE)
res_dims <- pca_obj$x[, 1:2] %>%
as.data.frame() %>%
dplyr::rename("PC_1" = "PC1", "PC_2" = "PC2")
} else if (DR_method == "tSNE") {
set.seed(123)
tsne_obj <- Rtsne::Rtsne(df[, ids_OK])
res_dims <- tsne_obj$Y %>%
as.data.frame() %>%
dplyr::rename("tSNE_1" = "V1", "tSNE_2" = "V2")
} else if (DR_method == "UMAP") {
umap_obj <- umap::umap(df[, ids_OK])
res_dims <- umap_obj$layout %>%
as.data.frame() %>%
dplyr::rename("UMAP_1" = "V1", "UMAP_2" = "V2")
}
res_dims <- cbind(df[1:2], res_dims)
groups <- length(unique(res_dims[,colnames(grp_df)[2],drop=TRUE]))
if (groups < 2) {
stop("The number of valid group levels is less than two")
}
if (groups > 6) {
color <- grDevices::hcl(
h = seq(15, 375, length = groups + 1),
l = 65, c = 100
)[seq(groups)]
shape <- rep(16, groups)
} else {
color <- RColorBrewer::brewer.pal(n = 6, name = palette)[seq(groups)]
shape <- c(15:20)[seq(groups)]
}
p <- ggplot2::ggplot(res_dims,
aes_string(colnames(res_dims)[3], colnames(res_dims)[4], color = colnames(res_dims)[2], shape = colnames(res_dims)[2])) +
ggplot2::geom_point() +
ggplot2::stat_ellipse() +
ggplot2::theme_classic(base_size = 20) +
ggplot2::guides(
color = guide_legend(title = NULL),
shape = guide_legend(title = NULL)
) +
ggplot2::theme(
legend.background = element_blank(),
legend.position = c(0, 0),
legend.justification = c(0, 0)
) +
ggplot2::scale_color_manual(values = color) +
ggplot2::scale_shape_manual(values = shape)
if (!is.null(add_margin)) {
geom_type <- switch(add_margin,
"density" = geom_density,
"boxplot" = geom_boxplot,
stop("Please choose one of density/boxplot marginal type")
)
p_right <- cowplot::axis_canvas(p, axis = "x") +
geom_type(
data = p$data, aes_string(x = colnames(p$data)[3], fill = colnames(grp_df)[2]),
alpha = 0.8, linewidth = 0.3
) +
ggplot2::scale_fill_manual(values = color)
p_top <- cowplot::axis_canvas(p, axis = "y", coord_flip = TRUE) +
geom_type(
data = p$data, aes_string(x = colnames(p$data)[4], fill = colnames(grp_df)[2]),
alpha = 0.8, linewidth = 0.3
) +
coord_flip() +
ggplot2::scale_fill_manual(values = color)
p_tmp <- p %>%
cowplot::insert_xaxis_grob(p_right, grid::unit(.2, "null"), position = "top") %>%
cowplot::insert_yaxis_grob(p_top, grid::unit(.2, "null"), position = "right")
p_tmp2 <- cowplot::ggdraw(p_tmp)
p_tmp2$data <- p$data
p <- p_tmp2
}
return(p)
}
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