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Summation bug?

ifomenko
15-Moonstone

Summation bug?

Hi, something strange with summation operator

Summation bug.png

I must get 2x2 matrix

3 REPLIES 3

In Prime 6 Express using numerics (attached):

Capture2.JPG

Must be either the way you wrote it

      what do the { } brackets mean, or

      the symbolic processor can't sort it out

Werner_E
25-Diamond I
(To:ifomenko)

Looks like a bug in the symbolic processor in conjunction with the summation symbol.

Numerically all is OK

Doing it symbolically without the summation symbol is doing OK, too

Looks like when using the summation that the symbolic confuses v*v^T with v^T*v

Werner_E_0-1580397758112.png

Looks like when using the summation that the symbolic confuses v*v^T with v^T*v

Werner_E_0-1580397884045.png

 

 

Werner_E
25-Diamond I
(To:Werner_E)

When you thought it can't get worse, then PTC came and gave us Prime 6 with new symbolic!

Primes new symbolic doesn't even bother to evaluate the expression and fails with a silly meaningless error message:

Werner_E_0-1580403033549.png

 

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