[Gretl-devel] Re: Datatypes of json items

Am 23.06.19 um 15:06 schrieb Allin Cottrell: > On Mon, 17 Jun 2019, Allin Cottrell wrote: > >> On Sat, 15 Jun 2019, Artur Tarassow wrote: >> >>> Dear all, >>> >>> I hope you had a successful gretl conference in Naples! >>> >>> I am currently working with json files again. Using latest git version of >>> gretl on Ubuntu linux (even though the behavior also occurs for older >>> versions), I've found that some of the json-elements grabbed are not of >>> the >>> expected datatype. See the the following example and the file attached: >>> >>> >>> <hansl> >>> string PATH2JSON = "/home/at/tmp/"                    # set your path >>> string jsonfile = sprintf("%s/ex_json_num_vector.json", PATH2JSON) >>> string jread = readfile("@jsonfile")

>>> bundle B = jsongetb(jread) >>> b = B.JSON >>> >>> # Evaluate type of elements >>> #----------------------------------------------------- >>> # Item         Expected        Is >>> # v1        string                null >>> # v2        string array       string array >>> # v3        scalar               scalar >>> # v4        matrix              string array >>> >>> loop i=1..nelem(b) -q >>>     string str = "v$i" >>>     eval b["@str"] >>>     eval typestr(typeof(b["@str"])) >>>     print "" >>> endloop >>> </hansl> >>> >>> Is there a rational reason for this behavior? >> Not really. It seems that typeof() is not reaching inside bundles to >> find the type of their contents. That should be made to happen. > Ah, that comment was not quite right: the failure of typeof() to reach > inside bundles (and arrays) was specific to the case of string > objects. That's now fixed in git; snapshots will follow. Thanks for the fix, Allin. However, why is a numeric vector (element v4) treated as a string array even though it comprises numeric values only? Is there any way to import it is a matrix datatype or some way to transform it to such a datatype using gretl?