Re: [R] Question about Rfast colMins and colMaxs

Stephen H. Dawson, DSL via R-help Fri, 03 Dec 2021 08:23:14 -0800

Thanks, Richard.

I am researching other library options for data inspection. I have manycsv files I am reviewing with different column names and data types.Flexibility of a quick review of max and min is quite valuable at thisjuncture.


I will implement your code recommendation next week and see how it performs.


Kindest Regards,
*Stephen Dawson, DSL*
/Executive Strategy Consultant/
Business & Technology
+1 (865) 804-3454
http://www.shdawson.com <http://www.shdawson.com>


On 12/2/21 11:06 PM, Richard O'Keefe wrote:

What puzzles me is why you are not just using
lapply(some.data.frame, min)
lapply(some.data.frame, max)
or as.vector(lapply(...))
Why go to another package for this?
Is it the indices you want?

col.min.indices <- function (some.data.frame) {
    v <- sapply(some.data.frame, function (column)
which(column == min(column))[1])
    names(v) <- colnames(some.data.frame)
    v
}

On Wed, 1 Dec 2021 at 07:55, Stephen H. Dawson, DSL via R-help<r-help@r-project.org <mailto:r-help@r-project.org>> wrote:


    Hi,


    I am working to understand the Rfast functions of colMins and
    colMaxs. I
    worked through the example listed on page 54 of the PDF.

    https://cran.r-project.org/web/packages/Rfast/index.html
    <https://cran.r-project.org/web/packages/Rfast/index.html>

    https://cran.r-project.org/web/packages/Rfast/Rfast.pdf
    <https://cran.r-project.org/web/packages/Rfast/Rfast.pdf>

    My data is in a CSV file. So, I bring it into R Studio using:
    Data <- read.csv("./input/DataSet05.csv", header=T)

    However, I read the instructions listed on page 54 of the PDF
    saying I
    need to bring data into R using a matrix. I think read.csv brings the
    data in as a dataframe. I think colMins is failing because it is
    looking
    for a matrix but finds a dataframe.

     > colMaxs(Data)
    Error in colMaxs(Data) :
       Not compatible with requested type: [type=list; target=double].
     > colMins(Data, na.rm = TRUE)
    Error in colMins(Data, na.rm = TRUE) :
       unused argument (na.rm = TRUE)
     > colMins(Data, value = FALSE, parallel = FALSE)
    Error in colMins(Data, value = FALSE, parallel = FALSE) :
       Not compatible with requested type: [type=list; target=double].

    QUESTION
    What is the best practice to bring a csv file into R Studio so it
    can be
    accessed by colMaxs and colMins, please?


    Thanks,

--*Stephen Dawson, DSL*

    /Executive Strategy Consultant/
    Business & Technology
    +1 (865) 804-3454
    http://www.shdawson.com <http://www.shdawson.com>
    <http://www.shdawson.com <http://www.shdawson.com>>

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Re: [R] Question about Rfast colMins and colMaxs

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