如何将R语言普通矩阵转换为非负矩阵

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setwd('C:\\Users\\czh\\Desktop')

library(Matrix)

rm(list=ls()) 

options(stringsAsFactors = F)

library(ConsensusClusterPlus)

dt <- read.csv("train.csv",header = T,
                   row.names = 1,
                   stringsAsFactors = F)

colnames(dt)

head(dt)


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for (i in 1:dim(dt)[2]) {

  dt[,i] <- ifelse( dt[,i] > median( dt[,i]), 1, 0)
  
}

head(dt)



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dt1 <- dt

 for (i in 1:dim(dt)[2]) {
  col_name1 <- paste0(names(dt)[i], '_low')
  dt1$col_name1 <- dt[,i]
  dt1$col_name1 <- ifelse(dt1$col_name1 == 0, 1,0)
  dt1[paste0(names(dt)[i], '_low')] = dt1$col_name1
  dt1$col_name1 <- NULL
  
  col_name2 <- paste0(names(dt)[i], '_high')
  dt1$col_name2 <- dt[,i]
  dt1$col_name2 <- ifelse(dt1$col_name2 == 1, 1,0)
  dt1[paste0(names(dt)[i], '_high')] = dt1$col_name2
  dt1$col_name2 <- NULL
 }
dt1 <- dt1[,-(1:dim(dt)[2])]
head(dt1)