@acer 

Thank for the explanation. I never thought of opening the file ina text editor.

@acer 

Thanks for your suggestion.

I am a sloppy typist and I wonder if perhaps I enterred control something rather than option something when I was trying for a Greek lettter or some such. If the 'character"  was invisible that would explain why I could not figure out what was happening. How did you find out the XML property view="presentation" part?

@Scot Gould dead_command.mw

Thanks for showing me how to upload worksheets.

The file is part of a project but it exhibits the problem I have. I cannot copy the command into a Maple prompt region.

Thanks for your interest.

@Scot Gould 

As I said, I can type in the commands (even with mis-spellings) and iy is okay. Why cannot I copy the text? What type of region does it copy to? There is no Maple prompt.

@Scot Gould 

I can't find any instructions.When I try to drag and drop it says "file format not supported"

I forgot to insert the command.
>

thans:= proc(z, T)
nansev(parameters = [z]);
namsev(T)
end proc;

Thank you.

It seems to me that there are quite a few very knowledgeable people at Maple. I have received much help from them over the years and I am grateful to them. BUT, perhaps some less savvy people are needed to test new packages, commands, etc. to see if the everage user can quickly get up to speed without having to ask for special help. In particular, help pages should have enouh clear examples so that one can quickly grab ab example and use it as a template withou having to read an explanation. (With all due respect, I always advise my students to skip the wordy and sometimes mysterious descriptions and go straight to the examples.)

thank you for your comment and code. I found it useful

I did not have the Context bar displayed. All is well. Sorry.

@Carl Love 

I am a Maple ambassasor and I encourage students to use Maple routinely as an aide in learning and doing math and I designed and implemented a course in using Maple to do just that. I also use Maple frequently in my research. Frankly, I don't give a hoot what is under the hood and I don't care how Maple works. I only care that it works. Mutable and immutable are totally unimportant until you get to large arrays; memory locations are Maple's concern, not mine. If V is an eigenvector of the matrix M with eigenvalue 7 I want the answer to the question is ( MV = 7V)  to be yes. That is what Mathematica answers, that is what every mathematician and physicist woud answer, that is the answer that would not confuse a student. I surely do not want to read help pages. I have always told my students to ignore everything on the help pages (at first go) and head for the examples at the end. A couple of those will get you on your way.

Times have changed. NO ONE reads instructions, every device comes with a quick start booklet. We do NOT teach our students hexidecimal notation so they can communicate with computers; we teach computers to deal with decimal notation. (My kids WERE taught hexidecimal.) 

The issue is NOT mor subtle; the implementation is just not wise or practical.

@ I agree that Maple is an older CAS but I think it has real strengths compared to newer languages. The problem I raised involves priorities-does a definition conform to standard mathematical usage or should some pretyy obscuure programming concern take precidence. Just as basic commands like plot can be modified to use fancy fonts for labels or to add titles by those to care to read the fine print one should get a true as an answer to the question is (Sv=Tv) in my example and a false to an inquiry of the form is(location Sv=location Tv).

@ Thank you for clarifying. I do not think Maple would be usable without the helpful responses on Maple Prime.

However, from a marketing point of view Maple has always excelled at simplicity of use, e;g;, plot or solve or fsolve are all easy to use out of the box with pretty obvious meaning and syntax. When the question of equality of two vectors refers to their storage locations rather than to their values that is VERY far from the obvious mathematical meaning. I would call it extremly eccentric with the potential to truly confuse students. I can certainly understand that the locations etc. might be of importance in certain situations I think making it the default is a bad design decsion.

@acer Thank you for clarifying that for me.

@ecterrab Thanks for repeating; I missed that. Muito obrigado!

@ecterrab How do I set one of the constants = 7 for example?

I tried c[1]:=7 but that does not work.