very dangerous bug in mcad14 m020!
very dangerous bug in mcad14 m020!
(OP)
dear all,
i found a very dangerous bug with such elementary operation like matrix vector multiplication.
if you try to multiply a matrix with a vector that you created using a little program , and the rows of the vector and the columns of the matrix do not match, mathcad nevertheless does the multiplication and gives not warning and completely overflowing results.
see uploaded mcad file:
htt p://files. engineerin g.com/getf ile.aspx?f older=b757 4bb0-d1b8- 49f6-95ff- e0e51011a6 37&fil e=mcad14_m 020_seriou s_bug.xmcd
here, a screenshot:
ht tp://files .engineeri ng.com/get file.aspx? folder=ff3 d61f7-6566 -4c7f-996e -71d86bf48 080&fi le=mcad14_ m020_serio us_bug.gif
could you please test if you get the same results / error?
or if this is a specific problem with my computer setup ?
i found a very dangerous bug with such elementary operation like matrix vector multiplication.
if you try to multiply a matrix with a vector that you created using a little program , and the rows of the vector and the columns of the matrix do not match, mathcad nevertheless does the multiplication and gives not warning and completely overflowing results.
see uploaded mcad file:
htt
here, a screenshot:
ht
could you please test if you get the same results / error?
or if this is a specific problem with my computer setup ?





RE: very dangerous bug in mcad14 m020!
RE: very dangerous bug in mcad14 m020!
from the docs:
"rnd(x) Returns a uniformly distributed random number between 0 and x."
could you download the mcad file and please test on your installation ?
RE: very dangerous bug in mcad14 m020!
TTFN
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RE: very dangerous bug in mcad14 m020!
You can post the problem here if you want:
http://collab.mathsoft.com/~Mathcad2000/
Although if you don't have an active $upport contract you're not eligible for any bug fixes.
Peter
RE: very dangerous bug in mcad14 m020!
i have no active $$$upport contract, thats the reason i was posting here and hoping that somehow the bug would "propagate" to mathsoft/ptc.
honestly... how can such a BIG bug slip through ? matrix vector ops are so fundamental..
RE: very dangerous bug in mcad14 m020!
This is a bug that should be fixed in M030 AND ... M030 should be free to registered users of MathCad 14 free.
We should not have to pay for bug fixes. If Microsoft had the same bug fix policy as PTC we would all be using Linux or Apple.