R help - Mar 2013 - Ignoring NA in matplot

Dear useRs,How to "matplot" a column of matrix while ignoring NA
values in it. More precisely, If a column has 10values in it, and row 7 and 8
are NA, instead of reading 7 and 8 as zeros, it should link 6th row with 9th.I
hope my question is understandable...Thanks in advance....Elisa
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