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oldmm
2007 Feb 27
5
Multiple conditional without if
...h has about 500 rows and 6 columns.
now i want to kick some data out.
i want create a new matrix which is basically the old one except for all
entries which have a 4 in the 5 column AND a 1 in the 6th column.
i tried the following but couldn´t get a new matrix, just some wierd
errors:
newmatrix=oldmatrix[,2][oldmatrix[,5]==4]&&oldmatrix[,2][oldmatrix[,6]
==1]
all i get is:
numeric(0)
does anybody have an idea how to fix this one ?
thx in advance
matthias
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