1-Visitor

Solved

Is it a bug in prime 2.0 with Jacobian??????

Forum|Forum|13 years ago
January 24, 2013
5 replies
5577 views

I was about to start a simple problem...and bam! Prime2.0 has its own math AGAIN! I am using Version M010 BTW...

See attached of the Jacobian! I am sure the jacobian matrix is not 3X1.. and the Jocobian determinent is not 0

.Or did they change the syntax for Jacobian ?

Oh my god...why would I trust prime 2.0 for any math?

It has just way too much problem....come one..it is not the first time...

if you have seen my older posts..you know this is not the first problem that I ran into with prime 2.0........................

1_simple-jacobian-mcdx.zip

Other

Best answer by Werner_E

I found it, but I don't know what its called in the english version. The argument xi in the function X when you call jacob is formatted as "variable" whereas the other as "none". So to Prime its not the same variable.

WE

S

StuartBruff

23-Emerald V

Hmm

henry leung wrote:
I was about to start a simple problem...and bam! Prime2.0 has its own math AGAIN! I am using Version M010 BTW...
See attached of the Jacobian! I am sure the jacobian matrix is not 3X1.. and the Jocobian determinent is not 0
.Or did they change the syntax for Jacobian ?
Oh my god...why would I trust prime 2.0 for any math?
It has just way too much problem....come one..it is not the first time...
if you have seen my older posts..you know this is not the first problem that I ran into with prime 2.0........................

It does look like something's different from M15.

I've only got Prime Express, which doesn't evaluate symbolics. Have you tried explicitly defining xi to be a 3-vector?

Stuart

W

Werner_E

25-Diamond I

Your worksheet did not work for me either.

I recreated it in MC15, converted it to Prime and now we have the correct results.

I could not spot a difference.

1_Jacob-mcdx.zip

A

AndyWesterman

12-Amethyst

I went same route of re-creating in 15.

- looks like another candidate from the mathcad mad-house.

Problem is with the first ξ in the Jacobian.

Regards

Andy

1_simple-jacobian-(2)-mcdx.zip

W

Werner_E

Answer

25-Diamond I

I found it, but I don't know what its called in the english version. The argument xi in the function X when you call jacob is formatted as "variable" whereas the other as "none". So to Prime its not the same variable.

WE

A

AndyWesterman

12-Amethyst

Of course. Keep on forgetting MP's little oddity there.

Nice to know why it fails

Thanks

Andy

P

ptc-4735478

Author

1-Visitor

PTC's introduction of labeling in prime is too troublesome....It was a good intention but often come out to be useless. I think they must add a reminder to user when ever the exact same 'name' has two different labelling. Math ad prime sometimes automatically choose different label for the same name and it is causing a headache to me.

thank WE very much for finding the glitch

P

ptc-4735478

Author

1-Visitor

Have a new question about the same worksheet.

This is more related to mathcad usage

Would like to solve x_greek[1, [2, [3, in terms of x[1, [2 and [3

or simply x_greek in terms of the component of x

I know how to do it without using index (I.E. using x_1 instead of x[1 )..

but if I do want to use it this way, what can I do? Because I do not want to type/copy and paste the equation again

Thanks