[R] Importing data in text file into R

From: amarjit singh sethi <ajss_gndu_at_yahoo.com>
Date: Fri, 23 May 2008 20:40:32 -0700 (PDT)


Dear all,
I am quite new to R; facing certain problems: Say, I have a text file( named as "try"):

Year	C1	C2	C3	C4	C5	C6
Y1	3.5	13.8	9.5	6.8	0.4	24.2
Y2	3.8	13.9	9.9	7.6	0.7	12.8
Y3	4.5	14.5	14.2	9.2	0.6	14.5
Y4	5.9	16.2	24.6	12.7	0.2	24.3
Y5	7.2	20.4	40.6	18.2	0.8	28.2
Y6	5.9	18.6	37.4	14.5	0.3	36.9
Y7	8.0	16.1	88.6	24.1	0.1	34.6
Y8	13.6	21.1	56.3	19.0	0.7	33.3

I wish to import the file into R and make certain computations, like intercorrelation matrix. I tried the following syntax:

# Inputting the data file (saved in text format) df="trial.txt"
idt=read.table(df,header=T, sep="\t")
idt
# To generate intercorrelatio matrix
r = cor(idt)
r=round(r, 4)
r

The seems to have been read, but further computations not made, with the following output:

> # Inputting the data file (saved in text format)
> df="trial.txt"
> idt=read.table(df,header=T, sep="\t")
> idt

  Year C1 C2 C3 C4 C5 C6

1   Y1  3.5 13.8  9.5  6.8 0.4 24.2
2   Y2  3.8 13.9  9.9  7.6 0.7 12.8
3   Y3  4.5 14.5 14.2  9.2 0.6 14.5
4   Y4  5.9 16.2 24.6 12.7 0.2 24.3
5   Y5  7.2 20.4 40.6 18.2 0.8 28.2
6   Y6  5.9 18.6 37.4 14.5 0.3 36.9
7   Y7  8.0 16.1 88.6 24.1 0.1 34.6
8   Y8 13.6 21.1 56.3 19.0 0.7 33.3

> # To generate intercorrelatio matrix
> r = cor(idt)

Error in cor(idt) : missing observations in cov/cor In addition: Warning message:
In cor(idt) : NAs introduced by coercion
> r=round(r, 4)

Error: object "r" not found
> r

Error: object "r" not found

Kindly advise me as to how to get rid of the error message.

AJSS



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