Re: [Gretl-devel] strange sum() behavior

# sum # # Output:  scalar or series # Argument:  x  (series, matrix or list) <hansl> clear scalar one = 1 catch scalar su = sum(one) clear matrix one = 1 scalar su = sum(one) nulldata 3 series one = 1 su0 = sum(one) su = sum(1) ### clear, the argument is treated as list ### with only element -- series number 1 scalar unit = 1 su2 = sum(unit) #also eval sum(1.0) catch eval sum(1.1) eval sum(0) # zero is interpreted as a list consisting only of the constant eval sum(const) # interestingly here 'const' is interpreted as series!!! series su3 = sum($pd) print su3 <hansl> My opinion: help lacks explanations of default interptetaions. SCALARS are not listed among arguments types AT ALL Hence, INTEGERS (including $pd) should be interpreted as one of the listed types (i.e. series, matrix or list) Examples above show that integers are interpreted as lists with 1 element: global series NUMBER inputted scalar Since, in sum(1) 1 is the number of series and this series builds a list with one element 1) In any case it is desirable to describe default integers behavior Also why interpretation of 0 and const is different in ols y 0 xlist and ols y const xlist 0 and const are the same 2) I do not know whether some changes are need but it is obvious that help to sum() should explain such things Oleh 13 лютого 2018, 12:30:44, від "Sven Schreiber" <svetosch(a)gmx.net&gt;: Hi, here's something that I find puzzling (snapshot Feb 7): <hansl> clear catch eval sum(1) # error: "no dataset active" catch scalar sc = sum(1) # ditto open djclose.gdt catch eval sum(djclose) # OK catch eval sum(1) # weird printout of all values, almost like 'print 1' catch scalar sc = sum(1) # error: "data types not matched" catch scalar sc = sum(djclose) # OK catch scalar sc = sum(1) # error: "sc is scalar, not acceptable" </hansl> I can understand the first two occurring "no dataset active" errors if gretl interprets the '1' as a series ID which it cannot find. But then: First the behavior yielding the weird printout looks like a bug. Secondly, the final two different error messages is something I don't get. Also bugs? thanks, sven _______________________________________________ Gretl-devel mailing list Gretl-devel(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-devel