@lampageu Sorry, I was too busy today and got back to MaplePrimes only now. Three suggestions:

For entering a Matrix interactively, the best approach is probably the DataTable component, introduced in Maple 15; see ?DataTableComponent. This can be assigned to a variable (such as your B or Z) directly and stored with your worksheet, i.e. is persistent.

Alternatively, use the Matrix palette. This approach is a bit older, and has some nice optics, but I find it less convenient.

I would not use a Maplet for that purpose nowadays.

@Markiyan Hirnyk Please see here.

@leiniu The slideshow mode is not designed to run code. You can modify plots, run animations, etc. but anything that changes the page length is be better presented in the worksheet itself.

@J4James  It still contains two very common beginner's errors: pi needs to be replaced by Pi, and function definitions should be entered using the arrow notation.

@YasH That's a good suggestion. Please use one of the buttons under "Was this information helpful?" at the bottom of that online help page. Thank you.

@Christopher2222 Exactly. Maple 9.5 was an exception, a major version. All the .01, .02 etc were minor updates aka dot releases. I've never heard of 18.15, by the way. :-)

Fortunately, such plots are easier to construct since 2015.

@Christopher2222 Yes, Carl is right: the Build ID, currently 1133417, is essentially counting complete system builds (which includes more than compiling C sources). AFAIR, this counter was introduced with Maple 6.

Your list of version numbers is a bit arbitrary in the sense that it includes some dot releases, but not all. For such a historical chart, I would simply focus on the main versions, and omit the dot releases, at least those after Maple 6.

@Markiyan Hirnyk That's true, t=-1 is fine, but  t=3/2 is a singularity and needs to be removed from the list.

Thanks for converting my Reply (and for voting). I often mix up those two buttons. Actually, I never liked the distinction between Reply and Anwer.

@tomleslie I'm using Firefox ESR 45.4.0 (which is a 32-bit application, but I don't think that matters here).

@mclaine Please upload your worksheet so that we can reproduce your attempts without retyping. From the initial example it was not clear that you only want to remove a certain unit.

@C1Ron You're welcome. I'm not following stackexchange, so I don't know much about their policies. If you like, you can vote up my answer - I guess that's what you mean.

@Carl Love Your guess is correct; see ?updates,Maple18,language if you want.

@Adam Ledger Sorry, I don't understand your comment. Your worksheet just contains the same input data and forms a list of pairs. That list can also be fed to NonlinearFit and related commands:

data := [seq([X[j], Y[j]], j = 1 .. Count(X))];
nlfit := NonlinearFit(f, data, x, output='parametervalues');

Does that address your question?

@tomleslie More precisely, the equation as such is easily solved (being linear, of 4th order, homogeneous, with constant coefficients):

sol := pdsolve(PDE1,'build');
pdetest(sol, PDE1);

It's the BVP that is more involved.

@tomleslie I think that "success" is just because there is something wrong with the first independent variable: the author used X mostly, but x at least in bcs3. [Hence pdetest does not confirm the solution you found, but emits an error message.] He should fix his worksheet, which is well structured otherwise.

Also, I don't see how this is related to MapleSim add-ons, but that's a minor issue.