Using latest snapshot,
Calling min() and max() with no dataset in place returns the error:
<error>
? eval min(m)
No dataset is in place
Terminated on error
</error>
Simply execute the following:
<hansl>
matrix m = seq(1,4)
# both fail
eval min(m)
eval max(m)
# works
eval maxc(m)
eval maxr(m)
</>
This must be due to a recent change, as I just ran a script which worked 
before.
Best
Artur