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what exactly is the dim of data set yarn in package "pls"?
5 messages · Jeff Newmiller, C W, William Dunlap
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Perhaps what is wrong is that you need to learn when to use the str() function.
str(yarn)
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C W <tmrsg11 at gmail.com> wrote:
Hi list, I am looking at the data yarn in package, I don't understand what is dimension of this data set. I did the following:
library(pls)
data(yarn)
dim(yarn)
[1] 28 3
head(yarn)
NIR.1 NIR.2 NIR.3 NIR.4 NIR.5 NIR.6 NIR.7 NIR.8 NIR.9 NIR.10 NIR.11 1 3.06630 3.08610 3.10790 3.09720 2.99790 2.82730 2.62330 2.40390 2.19310 2.00580 1.83790 2 3.06750 3.08570 3.09580 3.06920 2.98180 2.84080 2.67600 2.50590 2.35060 2.22300 2.11920 3 3.07500 3.09660 3.09160 3.02880 2.88490 2.68850 2.47640 2.26940 2.08240 1.91950 1.77470 4 3.08280 3.09730 3.10100 3.07350 2.99130 2.87090 2.73920 2.61020 2.50000 2.42370 2.37740 5 3.10290 3.10340 3.08480 3.02280 2.89270 2.71590 2.53840 2.37640 2.23970 2.13460 2.05340 6 3.08150 3.08490 3.04870 2.93050 2.73230 2.50890 2.29440 2.09950 1.93280 1.79250 1.66930 There were 270 columns, I only copy pasted the first 11 columns. But either way, this is NOT 3 columns. Could anyone let me know what is wrong here? Thanks in advance, Mike [[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
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Start by using str() to get an idea of the structure of this dataset
> str(pls::yarn)
'data.frame': 28 obs. of 3 variables:
$ NIR : num [1:28, 1:268] 3.07 3.07 3.08 3.08 3.1 ...
..- attr(*, "dimnames")=List of 2
.. ..$ : NULL
.. ..$ : NULL
$ density: num 100 80.2 79.5 60.8 60 ...
$ train : logi TRUE TRUE TRUE TRUE TRUE TRUE ...
I.e., it contains 3 things, each with 28 observations: a 268-column
matrix of numbers, NIR, a numeric vector, density, and a logical
vector, train. data.frames can contain matrices. They are not common,
but can be used for grouping purposes or because it is easier to
refer to NIR[,j] than paste(NIR, j, sep=".").
help(yarn) tells about the meaning of the components.
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of C W Sent: Saturday, October 06, 2012 6:45 PM To: r-help Subject: [R] what exactly is the dim of data set yarn in package "pls"? Hi list, I am looking at the data yarn in package, I don't understand what is dimension of this data set. I did the following:
library(pls)
data(yarn)
dim(yarn)
[1] 28 3
head(yarn)
NIR.1 NIR.2 NIR.3 NIR.4 NIR.5 NIR.6 NIR.7 NIR.8 NIR.9
NIR.10 NIR.11
1 3.06630 3.08610 3.10790 3.09720 2.99790 2.82730 2.62330 2.40390 2.19310
2.00580 1.83790
2 3.06750 3.08570 3.09580 3.06920 2.98180 2.84080 2.67600 2.50590 2.35060
2.22300 2.11920
3 3.07500 3.09660 3.09160 3.02880 2.88490 2.68850 2.47640 2.26940 2.08240
1.91950 1.77470
4 3.08280 3.09730 3.10100 3.07350 2.99130 2.87090 2.73920 2.61020 2.50000
2.42370 2.37740
5 3.10290 3.10340 3.08480 3.02280 2.89270 2.71590 2.53840 2.37640 2.23970
2.13460 2.05340
6 3.08150 3.08490 3.04870 2.93050 2.73230 2.50890 2.29440 2.09950 1.93280
1.79250 1.66930
There were 270 columns, I only copy pasted the first 11 columns. But
either way, this is NOT 3 columns.
Could anyone let me know what is wrong here?
Thanks in advance,
Mike
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.