comparison normalize.r @ 0:31cfcab40d8f draft

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0:31cfcab40d8f

#!/usr/bin/Rscript

#usage, options and doc goes here
argspec <- c("normalize.r - takes any flat file and normalizes the rows or the columns using various normalizations (median_shift, mean_shift, t_statistic (z-score), exp_fit, normal_fit, weibull_0.5_fit, weibull_1_fit, weibull_1.5_fit, weibull_5_fit). Requires a single header line and a single cloumn of annotation.
Usage:
    normalize.r input.tab norm_type norm_by > output.tab
Example:
	Rscript normalize.r test_matrix.tab median_shift column > output.tab
	Rscript normalize.r test_matrix.tab mean_shift row normals.tab > output.tab
Options:
	input matrix (annotated by row and column names)
	normalization type; available options:
		median_shift - shifts all values by the median or the row/column if no normals are specified, otherwise shifts by the median of normals
		mean_shift - shifts all values by the mean or the row/column if no normals are specified, otherwise shifts by the mean of normals
		t_statistic - converts all values to z-scores; if normals are specified then converts to z-scores within normal and non-normal classes separately 
		exp_fit - (only by column) ranks data and transforms exponential CDF
		normal_fit - (only by column) ranks data and transforms normal CDF
		weibull_0.5_fit - (only by column) ranks data and transforms Weibull CDF with scale parameter = 1 and shape parameter = 0.5
		weibull_1_fit - (only by column) ranks data and transforms Weibull CDF with scale parameter = 1 and shape parameter = 1
		weibull_1.5_fit - (only by column) ranks data and transforms Weibull CDF with scale parameter = 1 and shape parameter = 1.5
		weibull_5_fit - (only by column) ranks data and transforms Weibull CDF with scale parameter = 1 and shape parameter = 5
	normalization by:
		row
		column
	normals_file is an optional parameter which contains a list of column headers from the input matrix, which should be considered as normals
	output file is specified through redirect character >")

read_matrix <- function(in_file){
	header <- strsplit(readLines(con=in_file, n=1), "\t")[[1]]
	cl.cols<- 1:length(header) > 1
	data_matrix.df <- read.delim(in_file, header=TRUE, row.names=NULL, stringsAsFactors=FALSE, na.strings="NA", check.names=FALSE)
	data_matrix <- as.matrix(data_matrix.df[,cl.cols])
	rownames(data_matrix) <- data_matrix.df[,1]
	return(data_matrix)
	
	#read_mtrx <- as.matrix(read.table(in_file, header=TRUE, sep="", row.names=NULL, stringsAsFactors=FALSE, na.strings="NA"))	#separate on white characters
	#read_mtrx[,1]
	
	#return(as.matrix(read.table(in_file, header=TRUE, sep="", row.names=1)))	#separate on white characters
	#mtrx <- read.delim(in_file, header=TRUE, sep="", row.names=NULL, stringsAsFactors=FALSE, na.strings="NA")
	#print(mtrx[1,])
}

write_matrix <- function(data_matrix){
	header <- append(c("Genes"), colnames(data_matrix))
	write.table(t(header), stdout(), quote=FALSE, sep="\t", row.names=FALSE, col.names=FALSE)
	write.table(data_matrix, stdout(), quote=FALSE, sep="\t", row.names=TRUE, col.names=FALSE)
}

read_normals <- function(in_file){
	return(as.matrix(read.table(in_file, header=FALSE, sep="", as.is = TRUE))[, 1])
}

normalize <- function(data_matrix, norm_type, normals_list, tumors_list){
	if(norm_type == 'MEDIAN_SHIFT'){
		return(shift(data_matrix, 'MEDIAN', normals_list, tumors_list))
	}
	else if(norm_type == 'MEAN_SHIFT'){
		return(shift(data_matrix, 'MEAN', normals_list, tumors_list))
	}
	else if(norm_type == 'T_STATISTIC'){
		return(compute_z_score(data_matrix, normals_list, tumors_list))
	}
	else if(norm_type == 'EXPONENTIAL_FIT'){
		return(fit_distribution(data_matrix, 'EXPONENTIAL'))
	}
	else if(norm_type == 'NORMAL_FIT'){
		return(fit_distribution(data_matrix, 'NORMAL'))
	}
	else if(norm_type == 'WEIBULL_0.5_FIT'){
		return(fit_distribution(data_matrix, 'WEIBULL_0.5'))
	}
	else if(norm_type == 'WEIBULL_1_FIT'){
		return(fit_distribution(data_matrix, 'WEIBULL_1'))
	}
	else if(norm_type == 'WEIBULL_1.5_FIT'){
		return(fit_distribution(data_matrix, 'WEIBULL_1.5'))
	}
	else if(norm_type == 'WEIBULL_5_FIT'){
		return(fit_distribution(data_matrix, 'WEIBULL_5'))
	}	
}

shift <- function(data_matrix, shift_type, normals_list, tumors_list){
	return(t(apply(data_matrix, 1, shift_normalize_row, norm_type=shift_type, normals_list=normals_list, tumors_list=tumors_list)))
}

shift_normalize_row <- function(data_row, norm_type, normals_list, tumors_list){
	if(length(normals_list) == 0){	#no normals are specified
		if(norm_type == 'MEDIAN'){
			row_stat <- median(data_row)
		}
		else if(norm_type == 'MEAN'){
			row_stat <- mean(data_row)
		}
		return(unlist(lapply(data_row, function(x){return(x - row_stat);})))
	}
	else{	#normals are specified
		normal_values <- data_row[normals_list]
		tumor_columns <- data_row[tumors_list]

		if(norm_type == 'MEDIAN'){
			row_stat <- median(normal_values)
		}
		else if(norm_type == 'MEAN'){
			row_stat <- mean(normal_values)
		}
		return(unlist(lapply(tumor_columns, function(x){return(x - row_stat);})))
	}
}

compute_z_score <- function(data_matrix, normals_list, tumors_list){
	return(t(apply(data_matrix, 1, t_stat_normalize_row, normals_list=normals_list, tumors_list=tumors_list)))
}

t_stat_normalize_row <- function(data_row, normals_list, tumors_list){
	if(length(normals_list) == 0){	#no normals are specified
		row_mean <- mean(data_row)
		row_sd <- sd(data_row)
		return(unlist(lapply(data_row, function(x){return((x - row_mean)/row_sd);})))
	}
	else{	#normals are specified
		normal_values <- data_row[normals_list]
		normal_mean <- mean(normal_values)
		normal_sd <- sd(normal_values)
		normalized_normals <- unlist(lapply(normal_values, function(x){return((x - normal_mean)/normal_sd);}))
		
		tumor_values <- data_row[tumors_list]
		tumor_mean <- mean(tumor_values)
		tumor_sd <- sd(tumor_values)
		normalized_tumors <- unlist(lapply(tumor_values, function(x){return((x - tumor_mean)/tumor_sd);}))
		
		return(append(normalized_normals, normalized_tumors))
	}
}

rankNA <- function(col){		#originally written by Dan Carlin
	col[!is.na(col)]<-(rank(col[!is.na(col)])/sum(!is.na(col)))-(1/sum(!is.na(col)))
	return(col)
}

fit_distribution <- function(data_matrix, dist){
	if(dist == 'EXPONENTIAL'){
		ranked_data_matrix <- apply(data_matrix,2,rankNA)	#idea by Dan Carlin
		return(apply(ranked_data_matrix, c(1,2), qexp))
	}
	else if(dist == 'NORMAL'){
		ranked_data_matrix <- apply(data_matrix,2,rankNA)
		#return(apply(ranked_data_matrix, c(1,2), function(x){return(qnorm(mean=mean(x), sd=sd(x)));}))
		return(apply(ranked_data_matrix, c(1,2), qnorm, mean=0, sd=2))
	}
	else if(dist == 'WEIBULL_0.5'){
		ranked_data_matrix <- apply(data_matrix,2,rankNA)
		return(apply(ranked_data_matrix, c(1,2), qweibull, scale=1, shape=0.5))
	}
	else if(dist == 'WEIBULL_1'){
		ranked_data_matrix <- apply(data_matrix,2,rankNA)
		return(apply(ranked_data_matrix, c(1,2), qweibull, scale=1, shape=1))
	}
	else if(dist == 'WEIBULL_1.5'){
		ranked_data_matrix <- apply(data_matrix,2,rankNA)
		return(apply(ranked_data_matrix, c(1,2), qweibull, scale=1, shape=1.5))
	}
	else if(dist == 'WEIBULL_5'){
		ranked_data_matrix <- apply(data_matrix,2,rankNA)
		return(apply(ranked_data_matrix, c(1,2), qweibull, scale=1, shape=5))
	}
}

main <- function(argv) {  
	#determine if correct number of arguments are specified and if normals are specified
	with_normals = FALSE
	
	if(length(argv) == 1){
		if(argv==c('--help')){ 
			write(argspec, stderr());
			q();
		}
	}
		
	if(!(length(argv) == 3 || length(argv) == 4)){
		write("ERROR: invalid number of arguments is specified", stderr());
		q();
	}
	
	if(length(argv) == 4){
		with_normals = TRUE
		normals_file <- argv[4]
	}
	
	#store command line arguments in variables:
	input_file <- argv[1]
	norm_type <- toupper(argv[2])
	norm_by <- toupper(argv[3])
	
	#read the input file(s):
	data_matrix <- read_matrix(input_file)
	
	if(with_normals){
		normals_list <- read_normals(normals_file)
		normals_indices <- which(colnames(data_matrix) %in% normals_list)
		tumor_indices <- which(!(colnames(data_matrix) %in% normals_list))
		norm_by <- 'ROW'
	}
	else{
		normals_indices <- c()
		tumor_indices <- c()
	}
	
	#if normalize by columns then transpose the matrix:
	if(norm_by == 'COLUMN'){
		data_matrix <- t(data_matrix)
	}
	
	#normalize:
	data_matrix <- normalize(data_matrix, norm_type, normals_indices, tumor_indices)
	
	#if normalize by columns then transpose the matrix again since we normalized the transposed matrix by row:
	if(norm_by == 'COLUMN'){
		data_matrix <- t(data_matrix)
	}	
	
	write_matrix(data_matrix)
	#print(data_matrix)
}

main(commandArgs(TRUE))