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col_number() drops negatives #308

gregmacfarlane opened this issue Nov 3, 2015 · 7 comments

col_number() drops negatives #308

gregmacfarlane opened this issue Nov 3, 2015 · 7 comments


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@gregmacfarlane gregmacfarlane commented Nov 3, 2015

If I don't request specific column types, then read_csv treats negative numbers appropriately.


##    A B
## 1 -4 5

If I specify that the column is numeric, then read_csv drops the negative signs.

readr::read_csv("A,B\n-4,5G", col_types = "nn")

##   A B
## 1 4 5
gregmacfarlane added a commit to gregmacfarlane/trucksim_disagg that referenced this issue Nov 3, 2015
Also fixed reading the coordinates in, see tidyverse/readr#308
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@dyndna dyndna commented Nov 9, 2015

Specifying col_types= "d" will fix it, although I thought that n should be numeric and should not convert negative to positive values.

@hadley: Thanks for detailed documentation which I did not read until I noticed col_types issue in my data set. Following helped me to understand col_types.

?read_tsv and vignette("column-types")

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@rkarimi rkarimi commented Nov 25, 2015

Had the same problem, and was not sure what is the difference between n and d!

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@ctmann ctmann commented Mar 30, 2016

This introduces a new problem; d converts a number with commas to NA, but at least it warns the user. To confirm, please try the code below using the data on the attached spreadsheet, importing it using three different techniques (base R, readr without explicitly decaring coltypes, and finally, using your solution)

unzip_folder <- "~/R/TestBed/"
file <- "testbed.csv"
filename <- paste0(unzip_folder,file)



read_csv(filename, col_types = cols(
  Name = "c",
  Amounts = "d"))

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@hadley hadley commented Jun 2, 2016

This issue actually illustrates two problems:

  1. parse_number("-1) returns 1
  2. collector_guess("1G") returns "number"

@hadley hadley changed the title Explicit column types ignore negatives col_number() drops negatives Jun 2, 2016
@jimhester jimhester self-assigned this Jun 7, 2016
jimhester added a commit to jimhester/readr that referenced this issue Jun 8, 2016
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@jtr13 jtr13 commented Jun 26, 2016

col_number / parse_number doesn't work with negative currencies. (I'm using the dev version.) Thanks.

> parse_number("$3")
[1] 3
> parse_number("-$3")
Warning: 1 parsing failure.
row col expected actual
  1  -- a number     -$
[1] NA
Source: local data frame [1 x 4]

    row   col expected actual
  <int> <int>    <chr>  <chr>
1     1    NA a number     -$

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@ctmann ctmann commented Dec 10, 2016

This fails:

..but this works:

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@lock lock bot commented Sep 25, 2018

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue.

@lock lock bot locked and limited conversation to collaborators Sep 25, 2018
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