5:42 p.m.
Hi,
in applied work with a 'foreign' block where data is sent to R, I had
the case of a string-valued series which was transferred as strings and
then caused hiccups on the R side. I solved the problem by copying on
the gretl side the series to another one, which then --as described in
the guide-- only contains numbers.
However, I'm wondering whether it is an intended feature that the
"gretldata" object in the R context can contain non-number items?
Loosely related observation from working with 'foreign' and getting
errors: after an error occurred inside the block, re-starting the
containing hansl script sometimes then seems to stumble over leftovers
of the previous error. The cleanup of the transfer-to-R temp files is
not sufficient after an error, it seems. Having a "clear" statement at
the top of the script isn't enough, apparently. Doing a separate "clear"
in the console sometimes helps, and sometimes a gretl re-start is
necessary, too.
thanks
sven
11:20 p.m.
On Sun, Jan 26, 2025 at 12:43 PM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
in applied work with a 'foreign' block where data is sent to R, I had
the case of a string-valued series which was transferred as strings and
then caused hiccups on the R side. I solved the problem by copying on
the gretl side the series to another one, which then --as described in
the guide-- only contains numbers.
Give an example script, please.
Allin
4:56 p.m.
Am 27.01.2025 um 00:20 schrieb Cottrell, Allin:
On Sun, Jan 26, 2025 at 12:43 PM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
> in applied work with a 'foreign' block where data is sent to R, I had
> the case of a string-valued series which was transferred as strings and
> then caused hiccups on the R side. I solved the problem by copying on
> the gretl side the series to another one, which then --as described in
> the guide-- only contains numbers.
Give an example script, please.
Here's an example (where the data itself is based on the example in
chapter 16):
<hansl>
open data4-10
markers --to-array=S
series state = S
# print state --byobs
foreign language=R --send-data=state
print(gretldata)
print(as.matrix(gretldata))
end foreign
</hansl>
I'm not saying it's wrong that the strings are transferred, the question
right now is if it's intended. But then I was also a bit surprised that
in this example as.matrix still seems to keep the strings.
thanks
sven
1:37 p.m.
On Mon, Feb 3, 2025 at 11:56 AM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
Am 27.01.2025 um 00:20 schrieb Cottrell, Allin:
On Sun, Jan 26, 2025 at 12:43 PM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
in applied work with a 'foreign' block where data is sent to R, I had
the case of a string-valued series which was transferred as strings and
then caused hiccups on the R side. I solved the problem by copying on
the gretl side the series to another one, which then --as described in
the guide-- only contains numbers.
Give an example script, please.
Here's an example (where the data itself is based on the example in chapter 16):
<hansl>
open data4-10
markers --to-array=S
series state = S
# print state --byobs
foreign language=R --send-data=state
print(gretldata)
print(as.matrix(gretldata))
end foreign
</hansl>
I'm not saying it's wrong that the strings are transferred, the question right
now is if it's intended. But then I was also a bit surprised that in this example
as.matrix still seems to keep the strings.
Yes, it's intended that string values are transferred when series data
are passed from gretl to R. What sort of "hiccups" are you seeing on
the R side?
Allin
2:33 p.m.
Am 06.02.2025 um 14:37 schrieb Cottrell, Allin:
Yes, it's intended that string values are transferred when series
data
are passed from gretl to R. What sort of "hiccups" are you seeing on
the R side?
Never mind, it was just that I missed that the "country" variable was
string-valued in the first place, and then the routine on the R side
expected numbers, so that was the hiccup. Everything seems to work as
intended, so that's fine. The trick is really to know that on the gretl
side copying a string-valued series to another series converts it to
numbers. This is perhaps a bit surprising, but is documented alright.
thanks
sven
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