[R] Number changed weirdly when converting to numeric

Jeff Newmiller
2025-03-09T17:46:25Z

https://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f

https://0.30000000000000004.com/

On March 9, 2025 10:12:47 AM PDT, Christofer Bogaso <bogaso.christofer at
gmail.com> wrote:
>Hi,
>
>I have below simple conversion
>
>> sprintf("%0.15f",
as.numeric("-177253333.333333343267441"))
>
>[1] "-177253333.333333373069763"
>
>I could not figure out why the input and output is different?
>
>Clearly this conversion is incorrect. Is there any way to convert to
>numerical properly?
>
>> sessionInfo()
>
>R version 4.4.0 (2024-04-24)
>
>Platform: aarch64-apple-darwin20
>
>Running under: macOS 15.3.1
>
>
>Matrix products: default
>
>BLAS:
/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRblas.0.dylib
>
>LAPACK:
/Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRlapack.dylib;
> LAPACK version 3.12.0
>
>
>locale:
>
>[1] C/UTF-8/C/C/C/C
>
>
>time zone: Asia
>
>tzcode source: internal
>
>
>attached base packages:
>
>[1] stats     graphics  grDevices utils     datasets  methods   base
>
>
>loaded via a namespace (and not attached):
>
>[1] compiler_4.4.0
>
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--
Sent from my phone. Please excuse my brevity.