Converting variable names to variables

Question

I'm trying to print out all the variables in my environment that are of a certain type (for example 'matrix). I tried

for(f in ls()) {if(is.matrix(f) print(f) }

Obviously, this doesn't work because ls() returns a list of strings. I tried other things, but I can't seem to convert the string f into the variable f. Does anyone know how to do that?

In a nutshell, if I have a string variable y that holds "x", and x is also a variable in my environment, I want to use y to access x. Of course, I may not know a priori what value y holds.

arvi1000 · Accepted Answer · 2015-04-17 15:58:36Z

2

You might want get, to access the object

for(f in ls()) { if(is.matrix(get(f))) print(f) }

answered Apr 17, 2015 at 15:58

arvi1000

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MrFlick · Accepted Answer · 2015-04-17 16:01:46Z

2

You can use mget() to get the objects corresponding to a vector of variable names

for(f in mget(ls())) { if(is.matrix(f)) print(f) }

answered Apr 17, 2015 at 16:01

MrFlick

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