Thanks, Bill.
How do you go about getting maximum and minimum values from your
columns? Do you simply do them one column at a time? The functions I am
identifying from Rfast do this work in bulk.
*Stephen Dawson, DSL*
/Executive Strategy Consultant/
Business & Technology
+1 (865) 804-3454
http://www.shdawson.com <http://www.shdawson.com>
On 11/30/21 3:24 PM, Bill Dunlap wrote:
You can use as.matrix() to convert your data.frame to a matrix, but
that loses the speed/space advantages of colMins (as well as causing
issues if some columns are not numeric). You could write to the
maintainer of the package to ask that data.frames be directly
supported. In the meantime you could use
vapply(yourDataFrame, which.min, FUN.VALUE=NA_real_)
or
vapply(yourDataFrame, min, FUN.VALUE=NA_real_)
instead of colMins.
-Bill
On Tue, Nov 30, 2021 at 10:55 AM 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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