@Carl Love 

Sorry, I typed the resulting equation wrong from the book. It should be x+y=z, will correct now. thanks

@Axel Vogt 

I find it easier to use google search. Sometimes I am searching for things, and google search allows more complicated search queries and it is more convenient to use for searching. When I find the correct commands, I can then go to Maple itself and use the command.

I do not see why Maplesoft can't figure how to make a web help pages that shows up correctly and show the correct Maple commands on them. Is this really that hard?

@tomleslie 

Generally I only ever use the local help on my machine rather than the on-line version.

But many times one is googling and looking for some maple help, since it is easier, and can be faster and can find more things that way, but then find they can't copy or even read what is on the page, since it has the these dropped words and dropped numbers, which does not map to something one can copy and paste or even read. 

I also use 1D (worksheet) and do not use 2D for input at all. This makes the Maple help pages on the internet less useful than they should be.

I am a loss how can anyone at Maplesoft think having such web pages is a good idea and that it projects good image about Maple. I find them terrible. If Maplesoft is determined to make less and less people use Maple, they are really doing a very good job at it. 

http://www.maplesoft.com/support/help/Maple/view.aspx?path=FileTools%2fBinary%2fOpen

@Markiyan Hirnyk 

what about those who do not use document mode?

@Markiyan Hirnyk 

You can copy and paste to valid Maple code?  This is what I get

When I try to use the above, (after I put an actual file name there) I get

So I am copying invalid Maple syntax code.

@tomleslie 

You are correct. Starting Maple as admin works.

But this makes no sense at all. 

Is one supposed to run Maple as adminstrator just to create a text file?

If Maple is not running as me the user, what else is it running as? This is normal home PC, and I have only one user on it, which is me.

When I run Mathematica, I do not have to start it as admin to create a file. 

I just tried this on my G:\\ drive and I get no error. The erorr shows on the C:\\ drive

I started Maple as me for the above (not admin). Any idea why the above could happen? Is it possible becuase Maple itself is installed on the C:\\ drive, it does not allow creating any file on the same drive it is installed on? But this would make no sense.

thanks

How does the canonical diffusion mathematical equation looks like?

@acer 

That is good. I am not too familiar with Maple technologies. In this case the problem is really solved. The student simply download the app and run them on their computer.  This is what I do now when I want to run a Mathematica app (CDF) and it works much better than on the cloud or inside a browser.

@acer 

wow, this frontend trick is really nice!

@Carl Love 

thanks. Your additions helped. I did not know about the INTERVAL(2,0,4,0) syntax.  But I find this a little too complicated. I think it should handle this using INTERVAL(2,4), as in

restart;
a:= INTERVAL(2,4):
b:= INTERVAL(1,3):
c:= INTERVAL(1,3):
evalrC~([solve(a*x^2+b*x+c=0,x)]);

and it should do the right thing, but the above gives an error, without the user having to specify before the intervals using the complex notation, (2,0,4,0). In Mathematica it works using one notation.

But I will live with this for now ;)

@Carl Love 

thanks for the answer. But I thought the solutions were supposed to be real in the first example? When I write

restart;
with(Tolerances):
a:= 3 &+- 1;
b:= 2 &+- 1;
c:= 2 &+- 1;
sol:= {(-b + sqrt(b^2-4*a*c))/(2*a),(-b - sqrt(b^2-4*a*c))/(2*a)};

Maple says:

And the solution are real?  isn't the quadratic formula correct there? So x is real over all the interval.

Using your syntax, I also get the same error I showed before:

restart;
a:= INTERVAL(2..4):
b:= INTERVAL(1..2):
c:= INTERVAL(1..2):
evalr~([solve(a*x^2+b*x+c=0,x)]);

Error, (in evalr) not a real number

I must be doing something wrong, but do not see it now.

for the first one maple gives

asympt(sinh(x),x);

@acer 

thanks, I thought buildin means any Maple command such as int() and dsolve() etc...

I did try it before, but I must have done something wrong as it hanged when I tried it. But now it works using your code.

I'm struggling to get my head around using Z-transforms in maple

What steps would I have to take to get

a)

Find y[n], the inverse Z-transform of

z/(z-2) 5z/(z-5)^2

Can you show what have you tried? you must have tried something, since you say you are struggling? Typing "inverse Z transform Maple" in google shows the command with examples. So it is hard to see why are you struggling with this if you do not show what you tried so one can show you what error you made.

@Carl Love 

It is not working for Maple 2015. Is it not missing the (0) there? THis is what I get

restart;
x := t-> <x1(t),x2(t)>;
eq:=diff~(x(t),t$2) =~ <sin(t),t>;
ic1:=x(0)=~0;
ic2:=D~(map2(op, 0, x(t))) =~ 0;

But I think it should be:

To proof this, I did it by hand:

restart;
x := t-> <x1(t),x2(t)>;
eq:=diff~(x(t),t$2) =~ <sin(t),t>;
ic1:=x(0)=~0;
ic2:=<D(x1)(0)=0,D(x2)(0)=0>;
sys:={eq,ic1,ic2};
dsolve(sys,x(t));

and got solution. But if I used your method, I get errro:

restart;
x := t-> <x1(t),x2(t)>;
eq:=diff~(x(t),t$2) =~ <sin(t),t>;
ic1:=x(0)=~0;
ic2:=D~(map2(op, 0, x(t))) =~ 0;
sys:={eq,ic1,ic2};
dsolve(sys,x(t));

Error, (in dsolve) ambiguous input: the variables {x1, x2} and the functions {unknown(x1), unknown(x2), x1(t), x2(t)} cannot both appear in the system

thank you