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#' Visualize the distribution difference of samples after dimension reduction analysis
#'
#' @param ids molecular identifiers (>=3)
#' @param data_type molecular types, refer to query_pancan_value() function
#' @param group_info two-column grouping information with names 'Sample','Group'
#' @param DR_method the dimension reduction method
#' @param palette the color setting of RColorBrewer
#' @param add_margin the marginal plot (NULL, "density", "boxplot")
#' @param opt_pancan specify one dataset for some molercular profiles
#' @return a ggplot object or rawdata list
#' @export
#'
#' @examples
#' \dontrun{
#' group_info = tcga_clinical_fine %>%
#' dplyr::filter(Cancer=="BRCA") %>%
#' dplyr::select(Sample, Code) %>%
#' dplyr::rename(Group=Code)
#'
#' vis_dim_dist(
#' ids = c("TP53", "KRAS", "PTEN", "MDM2", "CDKN1A"),
#' group_info = group_info
#' )
#'
#' }
#'
vis_dim_dist <- function(ids = c("TP53", "KRAS", "PTEN", "MDM2", "CDKN1A"),
data_type = "mRNA",
group_info = NULL,
DR_method = c("PCA", "UMAP", "tSNE"),
palette = "Set1",
add_margin = NULL,
opt_pancan = .opt_pancan) {
# Mode <- match.arg(Mode)
DR_method <- match.arg(DR_method)
if (length(ids) < 3) {
stop("The number of valid ids is less than three. Please inspect the input ids and data_type(?query_pancan_value)")
}
exp_raw <- tryCatch(
{
purrr::map(ids, function(x) {
# x = ids[1]
data <- query_pancan_value(x, data_type = data_type, opt_pancan=opt_pancan)
data <- data[[1]]
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(exp_raw)) return(NULL)
# meta_raw = query_tcga_group(...)$data
if (is.null(group_info)) {
stop("Please input valid grouping information for `group_info` parameter.")
}
if(!all(colnames(group_info) == c("Sample", "Group"))){
stop("The group_info should have two colnames named `Sample` and `Group`.")
}
meta_raw = group_info
meta_data = meta_raw %>% dplyr::filter(.data$Sample %in% exp_raw$Sample)
if(nrow(meta_data)==0){
stop("No intersected samples are detected for the group_info.")
}
if(length(unique(meta_data$Group))<2){
stop("Less two valid groups are detected for the group_info.")
}
exp_data = exp_raw[match(meta_data$Sample, exp_raw$Sample), ]
ids_NAN <- colnames(exp_data[, -1])[apply(exp_data[, -1], 2, function(x) all(is.na(x)))]
ids_SD0 <- colnames(exp_data[, -1])[apply(exp_data[, -1], 2, function(x) stats::sd(x) == 0)] %>% na.omit()
ids_OK <- setdiff(ids, c(ids_NAN, ids_SD0))
# message(paste0((length(ids_OK)/length(ids))*100, "%"), " of input ids were obtained")
exp_data <- exp_data[, which(!colnames(exp_data) %in% c(ids_NAN, ids_SD0))]
if (DR_method == "PCA") {
pca_obj <- prcomp(exp_data[, ids_OK], center = TRUE, scale = TRUE)
res_dims <- pca_obj$x[, 1:2] %>%
as.data.frame() %>%
dplyr::rename("PC_1" = "PC1", "PC_2" = "PC2")
} else if (DR_method == "tSNE") {
if (!requireNamespace("Rtsne", quietly = TRUE)) {
stop(
"Package \"Rtsne\" must be installed to use this method.",
call. = FALSE
)
}
set.seed(123)
tsne_obj <- Rtsne::Rtsne(exp_data[, ids_OK])
res_dims <- tsne_obj$Y %>%
as.data.frame() %>%
dplyr::rename("tSNE_1" = "V1", "tSNE_2" = "V2")
} else if (DR_method == "UMAP") {
if (!requireNamespace("umap", quietly = TRUE)) {
stop(
"Package \"umap\" must be installed to use this method.",
call. = FALSE
)
}
umap_obj <- umap::umap(exp_data[, ids_OK])
res_dims <- umap_obj$layout %>%
as.data.frame() %>%
dplyr::rename("UMAP_1" = "V1", "UMAP_2" = "V2")
}
res_dims <- cbind(res_dims, meta_data) %>%
dplyr::inner_join(exp_data)
## Step5: ggplot scatter plot
group_levels = unique(res_dims$Group)
if (length(group_levels) > 6) {
colors <- grDevices::hcl(
h = seq(15, 375, length = length(group_levels) + 1),
l = 65, c = 100
)[seq(length(group_levels))]
shapes <- rep(16, length(group_levels))
} else {
colors <- RColorBrewer::brewer.pal(n = 6, name = palette)[seq(group_levels)]
shapes <- c(15:20)[seq(group_levels)]
}
p <- ggplot2::ggplot(res_dims, aes_string(colnames(res_dims)[1], colnames(res_dims)[2], color = "Group", shape = "Group")) +
ggplot2::geom_point() +
ggplot2::stat_ellipse() +
ggplot2::theme_bw(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)
legend.position = "bottom"
) +
ggplot2::scale_color_manual(values = colors) +
ggplot2::scale_shape_manual(values = shapes)
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)[1], fill = "Group"),
alpha = 0.8, linewidth = 0.3
) +
ggplot2::scale_fill_manual(values = colors)
p_top <- cowplot::axis_canvas(p, axis = "y", coord_flip = TRUE) +
geom_type(
data = p$data, aes_string(x = colnames(p$data)[2], fill = "Group"),
alpha = 0.8, linewidth = 0.3
) +
coord_flip() +
ggplot2::scale_fill_manual(values = colors)
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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