kathie wrote:
Dear R users,
I'd like to make this data
rem.y = c(-1,0,2,4,5)
from
y = c(-1,-1,0,2,2,2,2,4,4,5,5,5,5,5).
That is, I need to remove repeated values.
Here is my code, but I don't think it is efficient. How could I improve
this?
By using the 'unique' function, as in,
rem.y <- unique(y).
Almost any time you use subscripts, you should ask yourself if there's a
vectorized function already available.
#------------------------------------------------------------------------
y = c(-1,-1,0,2,2,2,2,4,4,5,5,5,5,5)
n=length(y)
for (i in 1:n) # removed same values in y
{
imsi = 0
if (i==1) {rem.y = y[i]}
else {c = length(rem.y)
for (j in 1:c) { if (y[i]==rem.y[j]) imsi=1 }
if (imsi==0) rem.y = c(rem.y,y[i])}
}
rem.y
#-------------------------------------------------------------------------
Any suggestion will be greatly appreciated.
Regards,
Kathryn Lord
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