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18-Opal

## A function or a variable name is required when I define derivative as a function of all 3 variables

Hi,

Why I cannot do like f2(x,y,z) as we can see the derivative result is depending on all 3 variables x, y, and z? Should be like that for f2? Prime 10

1 ACCEPTED SOLUTION

Accepted Solutions
24-Ruby V
(To:Cornel)

I would confirm that you found a BUG in Prime 10.

My first guess was that it may be due to wrong labelling of the variables/arguments, but this seems not to be the case here.

The work around using the symbolic evaluation should not be necessary.

The bug seems to concern only functions with more than two arguments, using a function with just two arguments works as it should.

Here is another workaround not needing the symbolics. A local assignment does the trick!

Nonetheless its a BUG which should be fixed!

16 REPLIES 16
18-Opal
(To:Cornel)

I think this is perhaps another bug coming along with Prime 10 as in Prime 9 is ok:

18-Opal
(To:Cornel)

Any workaround for Prime 10 to solve this?

18-Opal
(To:Cornel)

I think I found a way by evaluating the expression further, but I am waiting for others opinions if the above behaviour it should be like that in Prime 10:

24-Ruby V
(To:Cornel)

I would confirm that you found a BUG in Prime 10.

My first guess was that it may be due to wrong labelling of the variables/arguments, but this seems not to be the case here.

The work around using the symbolic evaluation should not be necessary.

The bug seems to concern only functions with more than two arguments, using a function with just two arguments works as it should.

Here is another workaround not needing the symbolics. A local assignment does the trick!

Nonetheless its a BUG which should be fixed!

24-Ruby V
(To:Werner_E)

Here some other workarounds.

Crazy! As long as any local assignment is involved, Prime seems to be happy 😉

But an assignment seems to be mandatory

18-Opal
(To:Werner_E)

@Werner_E wrote:

Nonetheless its a BUG which should be fixed!

@DJNewman...maybe the product team can take into consideration this.

17-Peridot
(To:Cornel)

'kay I emailed them.

The Mathcad powers that be appreciate bug reports sent through PTC eSupport's case logger more than they appreciate my emails, though. It's easier to keep track of problems and to fix them that way.

I manage the Creo and PTC Mathcad YouTube channels for PTC, as well as all PTC Mathcad marketing in general.
24-Ruby V
(To:DJNewman)

@DJNewman wrote:

'kay I emailed them.

The Mathcad powers that be appreciate bug reports sent through PTC eSupport's case logger more than they appreciate my emails, though. It's easier to keep track of problems and to fix them that way.

It sure may be easier for them, but not for the user wanting to report the bug.
So the question is who should have the inconvenience - the company that has a commercial interest in improving its product or the user who has stumbled across a bug and is willing to report it 😉
I would still vote for a low-threshold option to report bugs that is open to all users, even if it means extra work for the staff.

17-Peridot
(To:Werner_E)

Also, Werner, with regards to the low-threshold option, you should probably give that its own thread on PTC Community Feedback:

I manage the Creo and PTC Mathcad YouTube channels for PTC, as well as all PTC Mathcad marketing in general.
24-Ruby V
(To:DJNewman)

@DJNewman wrote:

Also, Werner, with regards to the low-threshold option, you should probably give that its own thread on PTC Community Feedback:

https://community.ptc.com/t5/PTC-Community-Feedback/bd-p/ptccommunityfeedback

No, sorry. I honestly believe that if PTC really would have a true interest in improving their stuff, that kind of low-threshold bug reporting would already exist for a long time. As we know, it doesn't and a thread in the community feedback would not make any difference.

18-Opal
(To:DJNewman)

But what is the procedure for sending a bug report to ptc by the user?

17-Peridot
(To:Cornel)

It's a process, but it's not as difficult as you're describing.

https://support.ptc.com/apps/case_logger_viewer/cs/auth/ssl/log

The number you ultimately need to give is your Service Contract Number. Mathcad, in-product, will tell you your Service Contact Number in the Options on the page where you configure your licence in the top right corner.

I manage the Creo and PTC Mathcad YouTube channels for PTC, as well as all PTC Mathcad marketing in general.
18-Opal
(To:DJNewman)

Ok, I am able to see my(company) Service Contract Number in the License tab, but I see that Mathcad is requesting me to write also Customer Number, and I am unable to see this number from Options -> License.

17-Peridot
(To:Cornel)

I don't know if this is a PTC thing because my access to eSupport will be different than yours, but if you click your name in the top right corner of eSupport, it should say the same of your company with a number in parenthesis. That's your customer number.

I manage the Creo and PTC Mathcad YouTube channels for PTC, as well as all PTC Mathcad marketing in general.
18-Opal
(To:DJNewman)

I cannot see what you said...

This account was created few years ago when I did not work at the company. So, at that time when I created this account in the creation process I did not introduced any customer number, etc.

From searching on internet I see this :

17-Peridot
(To:Cornel)

Try talking to the IT guy and see what happens. I'm pretty sure all he needs to do is log into eSupport and he can give you the number; it shouldn't be an arduous process for him.

There's probably something you can do in eSupport about this situation, but at this point, my knowledge of how it works is quite, quite limited.

(I'm a marketing guy not a customer support guy!)

I manage the Creo and PTC Mathcad YouTube channels for PTC, as well as all PTC Mathcad marketing in general.
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