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I need to extract numeric values from a variable which is a structure combined with numeric values and names
structure(c(-1.14332132657709, -1.1433213265771, -1.20580568266868,
-1.75735158849487, -1.35614113300058), .Names = c("carbon",
"nanotubes", "potential", "neuron", "cell", "adhesion"))
At the end I would like to have a vector with just this information
c(-1.14332132657709, -1.1433213265771, -1.20580568266868,
-1.75735158849487, -1.35614113300058)
how can I do it? many thanks
421
In this method to extract numbers from character string vector, the user has to call the gsub() function which is one of the inbuilt function of R language, and pass the pattern for the first occurrence of the number in the given strings and the vector of the string as the parameter of this function and in return, this ...
Vectors are basic objects in R and they can be subsetted using the [ operator. The [ operator can be used to extract multiple elements of a vector by passing the operator an integer sequence.
Both as.numeric() and unname() do this:
R> structure(c(-1.14332132657709, -1.1433213265771, -1.20580568266868,
+ -1.75735158849487, -1.35614113300058, NA),
+ .Names = c("carbon", "nanotubes", "potential",
+ "neuron", "cell", "adhesion"))
carbon nanotubes potential neuron cell adhesion
-1.14332 -1.14332 -1.20581 -1.75735 -1.35614 NA
R> foo
carbon nanotubes potential neuron cell adhesion
-1.14332 -1.14332 -1.20581 -1.75735 -1.35614 NA
R>
R> as.numeric(foo) ## still my 'default' approach
[1] -1.14332 -1.14332 -1.20581 -1.75735 -1.35614 NA
R>
R> unname(foo) ## maybe preferable though
[1] -1.14332 -1.14332 -1.20581 -1.75735 -1.35614 NA
R>
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