Suppress Symbolic Solution in M15

[StuartBruff]

I don't know if this has been noted before, but I managed (by accident) to suppress the display of a symbolic solve in M15 [Mathcad 15.0 (M030 [MC15_M030_20131216])]

Does this work in other versions of Mathcad?

Stuart

[MJG]

Interesting find.  It works for me in MC15_M010_20110622.

[LucMeekes]

Hi Stuart,

Here is Mathcad 11:

All reds are "This variable is not defined above".

Luc

[StuartBruff]

LucMeekes wrote:

Hi Stuart,

Here is Mathcad 11:

All reds are "This variable is not defined above".

Hmm, interesting, Luc.  So, the symbolic evaluation of q works, but the definitions don't carry over into the numerical world.

Stuart

[LucMeekes]

Yep, that's what it is.

So its partly helpful in Mathcad 11.

[Werner_E]

Wasn't aware of this. its nice and useful!

It also works if you type the symbolic expression anywhere on the sheet, cut it out via Ctrl-X (including the RHS) and then type yor function name like q(a,b,c):= make a pair of parantheses and copy in the placeholder you just created.

I like it!

[StuartBruff]

Werner Exinger wrote:

Wasn't aware of this. its nice and useful!

It also works if you type the symbolic expression anywhere on the sheet, cut it out via Ctrl-X (including the RHS) and then type yor function name like q(a,b,c):= make a pair of parantheses and copy in the placeholder you just created.

I like it!

Yes, I forgot to add that bit.  Here's another interesting little morsel - try typing f(n)= after creating such a definition!

Stuart

[VladimirN]

All the same here in MC15 M045.

[Werner_E]

StuartBruff wrote:

Here's another interesting little morsel - try typing f(n)= after creating such a definition!

Surprise!

That means that those functions don't return true numeric results and can't be used for plotting for example:

[ifomenko]

Yes, and it`s impossible to send it as argument to another function (:

[Werner_E]

---

@ifomenko wrote:

Yes, and it`s impossible to send it as argument to another function (:

---

Unless you redefine the new function with a symbolic eval as follow up

OR

you define the new function with symbolic eval.

But then you see again the result of the symbolic eval, so you could have it simpler in the first place 😉

[ifomenko]

Thanks

[LucMeekes]

It doesn't need to be so complicated, in Mathcad 11 I can:

The result is the same.

Luc

[LucMeekes]

That is, by the way, the same method I use to plug symbolic expressions into programs.

[RichardJ]

That also works in Mathcad 15:

[RichardJ]

Interesting find! I see two problems though:

1) Next time I will need this I will have forgotten how to do it.

2) It's a useful, but undocumented, feature, so at some point it will be taken away from us

[StuartBruff]

Richard Jackson wrote:

Interesting find! I see two problems though:

1) Next time I will need this I will have forgotten how to do it.

2) It's a useful, but undocumented, feature, so at some point it will be taken away from us

1).  Of course.  Goes without saying. 

2).  I'm tempted to mark your answer correct ...

Stuart

[Werner_E]

Richard Jackson wrote:

Interesting find! I see two problems though:

1) Next time I will need this I will have forgotten how to do it.

Agreed on!

2) It's a useful, but undocumented, feature, so at some point it will be taken away from us

Hmm, they won't change MC15 that much, I guess and with Prime they have already taken away from us so many documented features, too, so I think it does not matter if documented or not,

[VladimirN]

Stuart,

In the Mathcad 15 M045 service release I have only no symbolical answer for "p(n)", for the rest all too most, as at you (please see PDF attached).

[StuartBruff]

Спасибо, Владимир.

What does Prime do?  If it can't be directly implemented, does it still work in an imported (M15) worksheet?

Richard Jackson wrote:

Interesting find! I see two problems though:
1) ...
2) It's a useful, but undocumented, feature, so at some point it will be taken away from us 

Please let "The System" keep our toys in later versions ....

Stuart

[RichardJ]

What does Prime do?  If it can't be directly implemented, does it still work in an imported (M15) worksheet?

What a surprise:

[StuartBruff]

Richard Jackson wrote:

What does Prime do?  If it can't be directly implemented, does it still work in an imported (M15) worksheet?

What a surprise:

Would anybody with a current maintenance licence like to raise a bug report for this? (after all, it was a long-standing feature in <= Mathcad 15 )

Stuart

[LucMeekes]

Seems like Prime brought it back to the similar (non-)functionality as Mathcad 11.

What if you evaluate g(2,3) symbolically?

Luc

[RichardJ]

What if you evaluate g(2,3) symbolically?

The highlighted expression is nothing more than a bitmap image, because the converter didn't know what to do with it.

[StuartBruff]

LucMeekes wrote:

Seems like Prime brought it back to the similar (non-)functionality as Mathcad 11.

Hey! Progress!

Stuart

[VladimirN]

You can find PDF version of your both worksheets for Mathcad Prime 3.1 (without any edits made) in the attachment.

[Werner_E]

Richard Jackson wrote:

What does Prime do?  If it can't be directly implemented, does it still work in an imported (M15) worksheet?

What a surprise:

Not really.

I already noticed that we cannot use symbolic evaluations in a program as we no longer are able to copy them in the placeholders and converted sheets fail to work as you have shown.

Some useful, while admittedly tricky, programs (like symbolic ODE solvers) won't work in Prime 😞

[Werner_E]

In the Mathcad 15 M045 service release I have only no symbolical answer for "p(n)",

This is the usual behavior when the numerics choke on an unknown variable and you use inline symbolic evaluation.

use p(n)-> in a separate region and you will see the result.

Sometimes the results shows sudenly when you move the region around a bit.

[-MFra-]

Hi

With a little trick you avoid having the constants and variables  painted in red. 

[ifomenko]

I hope I understand your trick but it doesn`t work in my case and I don`t understand why.

File is attached