Question

我在数据框中有一些列需要进行对数转换。

我使用以下代码执行此操作：

$sql = "SELECT * FROM news ORDER BY n_date DESC LIMIT 1";

我收到了很多警告：

cols = c("LotArea", "MasVnrArea", "LotFrontage", "BsmtFinSF2", "LowQualFinSF", 
         "BsmtHalfBath", "KitchenAbvGr", "OpenPorchSF",
         "EnclosedPorch", "MiscVal", "PoolArea", "3SsnPorch", "ScreenPorch")
train[, which(names(train) %in% cols)] <- log(train[, which(names(train) %in% cols)] + 1, 2)

还有：

Supplied 13 items to be assigned to 1455 items of column 'LotFrontage' (recycled leaving remainder of 12 items)

我对指定的每个列都有相同的警告，所有列都是Coerced 'double' RHS to 'integer' to match the column's type; may have truncated precision. Either change the target column to 'double' first (by creating a new 'double' vector length 1455 (nrows of entire table) and assign that; i.e. 'replace' column), or coerce RHS to 'integer' (e.g. 1L, NA_[real|integer]_, as.*, etc) to make your intent clear and for speed. Or, set the column type correctly up front when you create the table and stick to it, please列

我做错了吗？

为了帮助重现，以下是int：

的输出

dput(head(train))

由于

列上的log变换会在r中生成警告

0 个答案: