[R] removing a specific number of digist from a character string

[Paul Hiemstra]

Hi Kim,

You could try:
substr("060907_17_3_5_1_1_2909.tif", start = 1, stop = 18)
?substr

cheers,
Paul

Kim Milferstedt schreef:
> Hello,
>
> I would like to remove the last 8 digists of character strings in a 
> vector. Below I added a couple of elements from that vector.
>
> I have a problem defining a pattern to replace the digits using for 
> example "sub". Removing the ".tif" part works fine using 
> sub('.tif',"",x), but how do I get rid of the four preceding digits?
>
> Thanks for your help,
>
> Kim
>
> Input:
> [3988] 
> "060907_17_3_5_1_1_2909.tif"   "060907_17_3_5_2_1_2910.tif" 
> "060907_17_3_5_3_1_2911.tif"
> [3991] 
> "060907_17_3_5_4_1_2912.tif"   "060907_17_3_5_5_1_2913.tif" 
> "060907_17_3_5_6_1_2914.tif"
>
> Desired output:
> [3988] "060907_17_3_5_1_1_"   "060907_17_3_5_2_1_"   "060907_17_3_5_3_1_"
> [3991] "060907_17_3_5_4_1_"   "060907_17_3_5_5_1_"   "060907_17_3_5_6_1_"
>
> __________________________________________
>
> Kim Milferstedt
> University of Illinois at Urbana-Champaign
> Department of Civil and Environmental Engineering
> 4125 Newmark Civil Engineering Laboratory
> 205 North Mathews Avenue MC-250
> Urbana, IL 61801
> USA
> phone: (001) 217 333-9663
> fax: (001) 217 333-6968
> email: milferst at uiuc.edu
> http://cee.uiuc.edu/research/morgenroth
>
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> and provide commented, minimal, self-contained, reproducible code.
>   


-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: 	+31302535773
Fax:	+31302531145
http://intamap.geo.uu.nl/~paul