R Error: unknown input format

问题

NEI <- readRDS(unz(tf, filename = "summarySCC_PM25.rds", open = "", encoding = getOption("encoding")))

Variable tf is a temporary file with a very specific location saved on the hard drive. It is my understanding that the format for unz() is:

unz(description, filename, open = "", encoding = getOption("encoding"))

As I read the documentation, I am interpreting that my application of the code is accurate as that:

description is a specific zip file destination, which outputs in var tf as c://...//345du.zip
filename is summarySCC_PM25.rds, which is the file to be extracted from tf
open is already established in the var so black should be fine
encoding labels the language type.

Within the context of the code above, I receive "Error: unknown input format" from R 3.1.1. I need clarification on what might be happening as that I interpret my code to be the same as:

NEI <- readRDS("summarySCC_PM25.rds")

Am I misinterpreting this?

回答1:

I found your data online so that I can read your file. It was available from here:

https://www.linkedin.com/today/post/article/20140617173447-5576436-explore-n-analyze-data-assignment-2

> unzip("C:\\Users\\jmiller\\Downloads\\exdata_data_NEI_data.zip")
> NEI <- readRDS("summarySCC_PM25.rds")
> dim(NEI)
[1] 6497651       6
> colnames(NEI)
[1] "fips"      "SCC"       "Pollutant" "Emissions" "type"      "year"

回答2:

Avoid unz() and use unzip(withanindex) since the temp file is a moving target

来源：https://stackoverflow.com/questions/25772964/r-error-unknown-input-format

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