如何告诉 R 正确舍入? [英] How can I tell R to round correctly?

问题描述

如何告诉 R 正确舍入?

How can I tell R to round correctly?

R 中的小数位我遇到了一个我不知道如何解决的问题我想让 R 计算 5/26*100 = 19.230769

Decimal Places in R I have encountered a problem that I cannot figure out how to solve I want R to calculate 5/26*100 = 19.230769

x <- 5/26*100
x

给我:

[1] 19.23077

让我们尝试使用round()，首先将数字设置为4:

Let's try to use round(), first setting the digits to 4:

x <- round(5/26*100,digits=4)
x

给出:

[1] 19.2308

接下来，让我们将数字设置为 5:

Next, let's set the digits to 5:

x <- round(5/26*100,digits=5)
x

给出:

[1] 19.23077

现在，让我们将数字设置为 6:

Now, let's set the digits to 6:

x <- round(5/26*100,digits=6)
x

给出:

[1] 19.23077

谁能告诉我如何解决这个问题?您是否得到相同的结果，或者您的 rstudio 是否正确舍入?

Can anyone tell me how to fix this? Do you get the same results, or does your rstudio round correctly?

我也累了signif()

I have also tired signif()

x <- signif(5/26*100,digits=6)
x

给我们:

[1] 19.2308

增加到 7 位数:

> x <- signif(5/26*100,digits=7)
> x
[1] 19.23077

增加到 8 位:

> x <- signif(5/26*100,digits=8)
> x
[1] 19.23077

我们可以使用 sprintf()

And we can use sprintf()

 > x <- sprintf("%0.6f", (5/26*100))
  > x
   [1] "19.230769"

sprintf() 通过四舍五入解决了问题，但它通过将数值更改为字符而产生了一个新问题.

sprintf() solves the problem with rounding, but it creates a new problem by changing the numeric value to a character.

谁能告诉我如何让 r 用数字输出给我 5/26*100 = 19.230769?

Can anyone show me how to get r to give me 5/26*100 = 19.230769 with a numeric output?

谢谢，

画画

推荐答案

问题是默认情况下，R 只会打印出 7 位数字.请参阅帮助页面 ?getOption 并搜索digits".

The problem is that by default, R will only print out 7 digits. See the help page ?getOption and search for "digits".

您可以通过更改设置来更改此设置以允许更多数字.

You can change this by changing the setting to allow for more digits.

options(digits=13)
round(5/26*100,digits=6)
[1] 19.230769
round(5/26*100,digits=7)
[1] 19.2307692
round(5/26*100,digits=8)
[1] 19.23076923

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