data want(keep=m1-m4);
set have;
length m1-m4 $30; /* adapt to max length needed */
array cx {4} c1-c4; /* input data */
array mx {4} m1-m4; /* calulated for output */
do i=1 to dim(cx);
if i=1 then m1 = c1; else m(xi) = catx('-',mx(i-1),cx(i));
end;
run;
data want(keep=m1-m4);
set have;
length m1-m4 $30; /* adapt to max length needed */
array cx {4} c1-c4; /* input data */
array mx {4} m1-m4; /* calulated for output */
do i=1 to dim(cx);
if i=1 then m1 = c1; else m(xi) = catx('-',mx(i-1),cx(i));
end;
run;
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