Description of problem:
I _think_ that it may be linked to filtering a dataframe with wrong arguments.

More precisely, this :
value = data[data$A==a & data$B==b, c('D'), data$C==c]

Instead of this :
value = data[data$A==a & data$B==b & data$C==c, c('D')]

Version-Release number of selected component:
R-core-3.0.2-1.fc20

Additional info:
reporter:       libreport-2.1.12
backtrace_rating: 4
cmdline:        /usr/lib64/R/bin/exec/R --no-save --args results.csv
crash_function: strcmp
executable:     /usr/lib64/R/bin/exec/R
kernel:         3.13.5-202.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 strcmp at ../sysdeps/x86_64/strcmp.S:1983
 #1 Rf_StringTrue at util.c:389
 #2 Rf_LogicalFromString at coerce.c:111
 #3 Rf_asLogical at coerce.c:1632
 #4 asLogicalNoNA at eval.c:1292
 #5 bcEval at eval.c:4236
 #6 Rf_eval at eval.c:545
 #7 Rf_applyClosure at eval.c:1019
 #8 applyMethod at objects.c:126
 #9 Rf_usemethod at objects.c:371