0

我有一个矩阵,基本上就像

100    2100  
31000  230  
31     9199

而且我希望每个数字都具有相同的大小,例如 100 --> 00100 或 9199 --> 09199。您对我有什么建议吗?

4

3 回答 3

2

你可以使用formatC

numMx <- matrix(c(100,2100,31000,230,31,9199),nrow=3,byrow=T)

frmt <- "d"   # d --> numbers formatted as integers
minWidth <- 5 # minimum characters length of each number e.g. 42 --> "00042"

chMx <- formatC(numMx, width = minWidth, format = frmt, flag = "0")

# > chMx
#      [,1]    [,2]   
# [1,] "00100" "02100"
# [2,] "31000" "00230"
# [3,] "00031" "09199"

要自动确定最小宽度,您可以使用以下代码:

minWidth <- max(nchar(formatC(numMx,format=frmt)))
于 2013-10-12T12:21:45.823 回答
2

您可以使用sprintf

dat <- read.table(text='100    2100  
31000  230  
31     9199')

max.len <- max(apply(dat,2,function(x)
           nchar(as.character(x))))

matrix(sprintf(paste0("%0",max.len,"d"), unlist(dat)),
          ncol=2)
于 2013-10-12T12:26:09.237 回答
0

我对相同的问题使用以下功能:

    add0 <- function(x, len) #x = number to add 0 ; len = the wanted length of the number
    {
     x.len <- length(unlist(strsplit(as.character(x), split = "")))
     ifelse(x.len < len, paste(paste(rep(0, len - x.len), collapse = ""), x, sep = ""), as.character(x))
    }

测试:

    mat <- matrix(sample(1:25, 25), 5, 5) #random matrix

    apply(mat, c(1,2), add0, len = max(nchar(as.character(mat)))) #change whole matrix using maximum "length" of its values
于 2013-10-12T12:21:28.870 回答