Ang. Re: [Gretl-devel] Bugs, missing features and a suggestion

Tuesday, 25 September 2007

svetosch(a)gmx.net @ INTERNET skrev 2007-09-25 14:02:40 :

...
 andreas.rosenblad(a)ltv.se schrieb:

 >
 > If it is a missing feature, please do implement it, so that the the
 > combined expression X = 1 & Y = 2 can be used for matrices

 I'm not against that feature, but note that you can do for example
 ((x=1).*(y=2) = 1), or ((x=1)+(y=2) = 2). 

Yes, but it is more cumbersome and less intuitive. Especially since X = 1 &
Y = 2 is allowed for scalars and data series, it should also be allowed for
matrices.

...
 > A second bug or missing feature: I want to initiate a matrix
with missing
...
 > values, where some cells with missing values will later be
replaced with
...
 > non-missing values. I got the following result when trying to
initiate a
...
 > matrix with missing values:
 >
 > ? A = {NA, NA; NA, NA}
 > Generated matrix A
 > ? A
 > A (2 x 2)
 >
 >  1.7977e+308  1.7977e+308
 >  1.7977e+308  1.7977e+308

 This may actually be correct, according to floating point representation
 of NAs (not 100% sure out of my head). Maybe it should be printed
 differently, however. 
I think it would be better if it was printed

NA    NA
NA    NA

...
 > For example, I use
 >
 > if sum(foo-int(foo))=0
 >       discrete foo
 > endif

 I don't understand; for example how would a discrete series with 0.5,
 -0.5, 0.5, .... turn out as discrete with your formula? 
You are absolutely right. My fault. I am only using discrete series with
positive integers, and for these my formula works.

Andreas

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