Dear Andreas,
On May 23, 2005, at 4:56 AM, Kraft, Andreas wrote:
Hi everyone,
I have a simple problem but donīt know how to solve it.
I read in a table from a text file that looks like that:
-3,932200E-01 -2,000000E-01 4,999995E-02
-3,932099E-01 -1,000000E-01 3,999996E-02
...
-3,931300E-01 0,000000E+00 3,499996E-02
but when I try to to plot the values from the
second column, the plot shows the wrong values.
That's what I do in R:
read.table("C:\\Messdaten\\epp1_1_ver.txt")->sh1
Read the help for read.table() and use dec = ",".
Also, before you correct the call to read.table, if you enter
R> str(sh1)
you'll see something like:
R> str(sh1)
`data.frame': 10 obs. of 3 variables:
$ V1: Factor w/ 10 levels "-3,931300E-01",..: 10 9 8 7 6 5 4 3 2 1
$ V2: Factor w/ 5 levels "-1,000000E-01",..: 2 1 4 1 1 5 3 4 4 4
$ V3: Factor w/ 5 levels "2,499996E-02",..: 5 3 3 4 4 2 3 1 1 2
which gives you some very helpful information. In particular, it
shows that sh1 consists of factors.
Good luck,
Stephen
sh1[1:10,2]
[1] -2.000000E-01 -1.000000E-01 0.000000E+00 -1.000000E-01
-1.000000E-01 3.000000E-01 -3.000000E-01 0.000000E+00
[9] 0.000000E+00 0.000000E+00
1707 Levels: -1,000000E-01 -1,000000E+00 -1,000000E+01 -1,002000E+02
-1,003000E+02 -1,004000E+02 ... 9,980000E+01
sh1[1:10,2]->a
cbind(x=seq(1,10,by=1),y=a)
x y
[1,] 1 436
[2,] 2 321
[3,] 3 1007
[4,] 4 321
[5,] 5 321
[6,] 6 1353
[7,] 7 548
[8,] 8 1007
[9,] 9 1007
[10,] 10 1007
Why do I get those values? Why is for example -2,000000E-01 equal to
436?
I need to convert the values from -2,000000E-01 to -0.2 - how can I
do this?
Thank you for your suggestions,
Andreas Kraft
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