[R] summarize rows in a matrix differing only in one value

[Rainer Tischler]

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Hi,=0A=0AI'd like to replace rows in a matrix which differ only in their va=
lues for one numerical column ("Vx") by a single row in which the value for=
 Vx is replaced by the median of Vx in the original rows. Vx is always the =
same column.=0ASo far, I got the reduced matrix without the Vx-column using=
:=0A=0Areduced_mat <- unique(original_mat[,-indVx])=0A=0Awhere "indVx" stan=
ds for the number of the Vx-column. Now I still need to get the column with=
 the corresponding medians for the unified entries. How can I do this effic=
iently (i.e. without for-loops, etc.)?=0A=0AMany thanks in advance,=0ARaine=
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