有没有办法在 R 数据帧中使用 32 位浮点数而不是 64 位浮点数？

Question

The issue I'm having is related to memory. I'm doing financial calculations on dollar amounts and currently my float precision is 64-bits. I'd like to reduce the precision down to at least 32-bits but so far have not found a way to specify this in R. Ideally, this would just be applied to a dataframe that has a number of columns some are ints and some are floats.

Answer 1

No, there is not -- at least not in 'base R' which has only one integer and numeric (floating point) type each, and their sizes are fixed.

You can inspect them (and more) via .Machine -- see help(".Machine") .

Now, for your dollar amounts you could of course resort to expressing things in cents instead in which case you could integer -- which is generally half the size of numeric .

Answer 2

The following converts all numeric columns in numeric_df to float32

library(float)
library(purrr)

float32_df <- purrr::modify_if(numeric_df, is.numeric, as.float)