转换1 x 10-10 intp 1E-10

Question

我有一列要更改的250行。

例如：1 x 10-10成1E-10或 3.51 x 10-16变成3.51E-16

每列中都有不同的P值。

Answer 1

Using evil parse:

sapply(chartr("x-", "*^", x), function(i) eval(parse(text = i)), USE.NAMES = FALSE)
# [1] 1.00e+10 3.51e+16

Just noticed it is minus in power:

sapply(gsub("-", "^-", gsub("x", "*", x, fixed = TRUE), fixed = TRUE), 
       function(i) eval(parse(text = i)), USE.NAMES = FALSE)
# [1] 1.00e-10 3.51e-16

If the answer is parse() you should usually rethink the question.
- Thomas Lumley, R-help (February 2005)