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02-02-2018
08:49 AM

02-02-2018
08:49 AM

Symbolics...what am I doing wrong?

Using symbolics (4.0) to develop an algebraic solution - but I get more than I bargained for.

I can't seem to find an assume or other feature to simplify this. I'm assuming I need to specify real solutions or similar but that doesn't seem to work. What I'm expecting to see is:

PR=

Any ideas?

Thanks,

6 REPLIES 6

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02-02-2018
12:51 PM

02-02-2018
12:51 PM

Re: Symbolics...what am I doing wrong?

What are you doing wrong?

Using Mathcad for symbolic solving!

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02-02-2018
01:59 PM

02-02-2018
01:59 PM

Re: Symbolics...what am I doing wrong?

I agree with Fred 😉

I assume that j should NOT denote the imaginary unit, right?

Here is my best attempt - I had no luck in persuading Prime to return only the real solution (the one with _x=0)

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02-03-2018
05:25 PM

02-03-2018
05:25 PM

Re: Symbolics...what am I doing wrong?

I don't, but then... I have Mathcad 11:

Success!

Luc

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02-04-2018
10:43 AM

02-04-2018
10:43 AM

Re: Symbolics...what am I doing wrong?

wrote:

I don't, but then... I have Mathcad 11:

Success!

Luc

Still disappointing when we expect something more simple like this

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02-04-2018
01:47 PM

02-04-2018
01:47 PM

Re: Symbolics...what am I doing wrong?

Disappointing? This is disappointing:

And it doesn't matter if the brackets () are there or not.

Luc

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02-04-2018
03:16 PM

02-04-2018
03:16 PM

Re: Symbolics...what am I doing wrong?

Seems that uncle Wolfram interprets PR as text which he doesn't understand and not as a two letter variable name.

I have not much experience with Wolfram Alpha so I don't know if its possible to use multiple letter variable names with some special syntax but from what I have seen so far it looks like WA would only accept single letter names, alpha beta, etc and indexed variables but only if the index is a number.

I would have guessed that using assume or simplify Maple in MC11 would be able to do the job, like other software do out of the box (here with Geogebra CAS):