在某些数值上使用as.character（）时遇到了一个有趣的行为。
说我有这个载体：
test <- seq(-1.5,1,0.02)
现在，如果我把它作为字符，它会产生：
as.character(test)
[1] "-1.5" "-1.48" "-1.46" "-1.44" "-1.42" "-1.4" "-1.38"
[8] "-1.36" "-1.34" "-1.32" "-1.3" "-1.28" "-1.26" "-1.24"
[15] "-1.22" "-1.2" "-1.18" "-1.16" "-1.14" "-1.12" "-1.1"
[22] "-1.08" "-1.06" "-1.04" "-1.02" "-1" "-0.98" "-0.96"
[29] "-0.94" "-0.92" "-0.9" "-0.88" "-0.86" "-0.84" "-0.82"
[36] "-0.8" "-0.78" "-0.76" "-0.74" "-0.72" "-0.7" "-0.68"
[43] "-0.66" "-0.64" "-0.62" "-0.6" "-0.58" "-0.56" "-0.54"
[50] "-0.52" "-0.5" "-0.48" "-0.46" "-0.44" "-0.42" "-0.4"
[57] "-0.38" "-0.36" "-0.34" "-0.32" "-0.3" "-0.28" "-0.26"
[64] "-0.24" "-0.22" "-0.2" "-0.18" "-0.16" "-0.14" "-0.12"
[71] "-0.0999999999999999" "-0.0800000000000001" "-0.0600000000000001" "-0.04" "-0.02" "0" "0.02"
[78] "0.04" "0.0600000000000001" "0.0800000000000001" "0.1" "0.12" "0.14" "0.16"
[85] "0.18" "0.2" "0.22" "0.24" "0.26" "0.28" "0.3"
[92] "0.32" "0.34" "0.36" "0.38" "0.4" "0.42" "0.44"
[99] "0.46" "0.48" "0.5" "0.52" "0.54" "0.56" "0.58"
[106] "0.6" "0.62" "0.64" "0.66" "0.68" "0.7" "0.72"
[113] "0.74" "0.76" "0.78" "0.8" "0.82" "0.84" "0.86"
[120] "0.88" "0.9" "0.92" "0.94" "0.96" "0.98" "1"
所以有一些值可以得到额外的数字，我宁愿没有。
我知道这是由于数字如何存储在R中，但我仍然希望有一个字符串向量对应于我在第一个向量中的数字（为了访问矩阵中的某些行和列） ，我需要名字相同）。
改为
as.character(round(test,digits=2))
解决了我的问题，但我并不完全确定它是万无一失的。有人有建议吗？还是有一些我忽略的东西？
谢谢！