On Tue, 25 Sep 2007, andreas.rosenblad(a)ltv.se wrote:
> Third, I have a few feature requests:
>
> 1. It should be possible to use the xtab command with nx1 matrices,

i.e.
> the inputs are matrix vectors
matrix->series conversion is not that hard; are you sure you need this
badly?

Well, currently I have to do as follows:
a = rows(A)
smpl 1 a
series Anew = A
series Bnew = B
xtab Anew Bnew
delete Anew bnew
smpl --full
Thus, I have to use 7 commands. Instead I would like to use just one
command:
xtab A B
It would be much easier and efficient, having to write less code. So I
would really appreciate it.
> 2. The xtab command should be able to take a nxn matrix with
discrete
> values as input an calculate a cross table from this, where this matrix

is
> the inner square matrix of the cross table (i.e. the cross table
except

the
> marginals)
I'm afraid this is not very clear to me. What is the input, exactly? By

my
possibly wrong impression, however, it looks like you can get this
by
using sumc(), sumr() and the concatenation operators "~" and "|".

For a matrix C = {3,2;2,3} gretl currently give the following output:
? C
C (2 x 2)
3 2
2 3
What I am asking for is following output
? xtab C
[ 1][ 2] TOT.
[ 1] 3 2 5
[ 2] 2 3 5
TOTAL 5 5 10
I need this function mainly for producing nice outputs with column and row
headings, and I thought this would be the easiest way to implement it.
A better solution, that better suits my needs, but maybe is harder to
implement, is to create a new "printtable" command that attaches column and
row names to a matrix (something like the dimnames argument in the matrix
command in R) as well as row and column headings.
Ideally, a command "printtable" would produce something like:
A = {3, 2, 5; 2, 3, 5; 5, 5, 10}
printtable A rownames={"row 1", "row2", "Total"}
columnnames={"col 1", "col
2", "Total"} \
columnheading="Variable 1" rowheading="Variable 2"
And then with this input give the following output:
Variable 1
col 1 col 2 Total
row 1 3 2 5
Variable 2 row 2 2 3 5
Total 5 5 10
Would this be possible to implement in gretl?
> 3. After calculating a cross classification table from View >
Cross
> Tabulation in the GUI, one gets the possibility to save the output

table as
> a matrix. This feature should be available also from the command
line
> interface.
This is exactly what the mxtab function is for. Am I missing something?

I'm sorry, I couldn't find anytning about that function in the Gretl
Command Reference, the Gretl User's Guide or the help files.
> 4. The parameterts of a function can currently be of six types:
bool,

int,
> scalar, series, list, matrix. Please include a third type
"discrete" or
> "disc" for a discrete data series
>
> 5. Create a new boolean command isdiscrete() to check if a series or

matrix
> contains only discrete values, with outputs 1 if it is discrete
and 0
> otherwise.
This is doable quite easily and certainly useful. The availability of

such
function, though, would probably make your item 4 redundant,
wouldn't it?

Maybe.
Best regards,
Andreas