Hi all,
next problem with matrices :(
(All with German local with comma as decimal delimiter)
Fill A1:C3 with
1 2 3
3 6 9
9,1 18 27
Calculate =MINVERSE(A1:C3)
I get
0,-1.#NANE+000 #VALUE! #VALUE!
#NUM! #NUM! #VALUE!
#NUM! #NUM! #VALUE!
I guess, that the wrong notation in upper, left cell is already tracked
in issue 114125. But I think, Calc should not return #NUM! or #VALUE! at
all, but Err:502 (illegal argument), because the matrix is singular.
The LU decomposition has a zero in the diagonal, so it is possible to
detect this case. Excel and Gnumeric return #NUM! in the whole range.
Fill A1:D4 with
1 2 3 4
3 6 9 12
9 18,127 36
12,124 36 48
Calculate =MINVERSE(A1:D4)
I get in full science notation
-6,809917355371900E+001 -1,652892561983470E+001 0,000E+000
1,000E+001
-5,150539867109620E+001 -1,293916112956810E+001 9,860E+000
-5,177106436424810E-014
1,926351720312250E+015 -6,421172401040780E+014 1,670843776116550E-002
-1,408521303258110E+000
-1,444763790234140E+015 4,815879300780690E+014 -5,012531328320800E+000
-1,443609022556390E+000
which is in two decimal place notation
-68,10 -16,53 0,0010,00
-51,51 -12,94 10,00 0,00
1926351720312250,00 -642117240104078,00 0,02-1,41
-1444763790234140,00481587930078069,00 -5,01 -1,44
If the user sees this result, he will be cautious. But it might be
hidden as intermediate part of a larger formula. So the user does not
notice that the result is totally wrong. LINEST needs calculating an
inverse matrix for the statistics, but does of cause do not show the
matrix but the statistics, so that the user might not detect, that the
values are wrong.
Gnumeric returns #ZAHL! errors and Excel returns the same wrong values
as Calc.
Should I test the intermediate results in LINEST to catch this cases and
return an error?
kind regards
Regina
-
To unsubscribe, e-mail: dev-unsubscr...@sc.openoffice.org
For additional commands, e-mail: dev-h...@sc.openoffice.org
