Ok, I like Python now

Whoever said that Perl had to be the language in which to write super-complicated commands all on one line? This Python command will turn a list of lists into a string amenable to writing to a file as MATLAB input:
result = '[' + "\n ".join([" ".join(["%6g" % val for val in line]) for line in array]) + ']'

EDIT: using generator comprehensions rather than list comprehensions for greater efficiency (thanks, Mike):result = '[' + "\n ".join(" ".join("%6g" % val for val in line) for line in array) + ']'