On 14/02/17 05:50, Fix Ace via R-help wrote:

Well, I am not trying to print anything. I just would like to get the dimension 
information for all the dataframes I created. Could you please help me to 
develop the script?
Thanks.
Ace

Yes you *are* trying to print something. You are trying to print the dimension information, i.e. dim(get(i))!!! For Pete's sake (a) *think* about what you are doing and (b) *try* example that Duncan suggested to you.

cheers,

Rolf Turner

    On Saturday, February 11, 2017 7:53 PM, Duncan Murdoch 
<murdoch.dun...@gmail.com> wrote:


 On 11/02/2017 1:33 PM, Fix Ace via R-help wrote:
Hello, there,
I wrote a loop to check the dimension of all the .txt dataframes:> ls()
  [1] "actualpca.table" "b4galnt2"        "b4galnt2.txt"    "data"
  [5] "galnt4"          "galnt4.txt"      "galnt5"          "galnt5.txt"
  [9] "galnt6"          "galnt6.txt"      "glyco"          "glyco.txt"
[13] "i"              "mtscaled"        "newsig.table"    "nicepca"
[17] "pca"            "sig.txt"        "st3gal3"        "st3gal3.txt"
[21] "st3gal5"        "st3gal5.txt"    "st6gal1"        "st6gal1.txt"
for(i in ls(pattern="txt")){dim(get(i))}

If I check individual ones, they are ok:
dim(get("galnt4.txt"))
[1] 8 3

could anyone help me to figure out why it did not work with a loop?
Thanks a lot!

It's the difference between

for (i in 1:10) i

(which prints nothing) and

for (i in 1:10) print(i)

Duncan Murdoch




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