[R] sapply/lapply instead of loop

[GL]

Using the input below, can I do something more elegant (and more efficient)
than the loop also listed below to pad strings to a width of 5? The true
matrix is about 300K rows and 31 columns. 

#######################
#INPUT
#######################
> temp
    DX1   DX2   DX3
1 13761  8125 49178
2 63371   v75 22237
3 51745 77703 93500
4 64081 32826   v72
5 78477 43828 87645
> 

#######################
#CODE
#######################

ssize <- c(nrow(temp), ncol(temp))
aa <- c(1:ssize[2])
aa <- paste("DX", aa, sep = "")
record <- matrix("?", nrow = ssize, ncol = ssize[2])
colnames(record) <- aa

mm <- 0
    #for (j in 1:1) {
    for (j in 1:ssize[1]) {
        mm <- j
        a <- as.character(as.matrix(as.data.frame(temp[j,])))
        len2 <- sum(a != "?")
        mi <- 0
        for (k in 1:len2) {
            aa <- a[k]
            a0 <- 5 - nchar(aa)
            if (a0 > 0) {
                for (st in 1:a0) {
                  aa <- paste(aa, " ", sep = "")
                }
            }
            record[j, k] <- aa
        }
    }

#######################
#OUTPUT
#######################

    DX1   DX2   DX3
1 13761  8125 49178
2 63371   v75 22237
3 51745 77703 93500
4 64081 32826   v72
5 78477 43828 87645
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