@Carl Love 

ok thanks, will put in separate execution group. But I also noticed strange things, having to execute proc() two times for it to work.

Is there anyway I can solve this problem?

The two obvious solutions I can think of now, is 1) reduce the number of points 2) buy more memory for you PC.

what is the advantage of writing

         v:=unapply(H*sin(w*t),t);

vs. the more clear

         v:=t->H*sin(w*t);

@tomleslie 

Still not completely sure why you want to save as a string

So I can document the commands I used? Saving the commands to plain text file. I am sure I am not the first person to want do this :) I did not know I need to convert the command to string, since it worked before when the dsolve has no functions in it. So I assumed it should always work.

ie ||, is in fact Maple's concatenation operator: this helps to explain the output you originally obtained - which now seems to have disappeared(??)

The output is still there. I did not remove it. I am looking at it now as I write this. May be this is a bug in this forum or some delay in seeing it.?

@tomleslie 

thank you! Yes, that is what I want. Why do you say not a good idea? I am trying to save the command I used as string to a file. Do you suggest a better way to do it?

thanks again

@Kitonum 

Nice solution, but this illustrates the problem with Maple organization of things. Too many packages, and subpackages and options and suboptions spread all over the place. Way too complicated. How is a user supposed to find these things and put them together?

In Mathematica, everything is in the open and much easier to find. No packages and subpackage to load. Options work in the same way across the whole system and in similar way.

p = ParametricPlot[{Cos[t], Sin[t]}, {t, 0, 2 Pi}];
p /. Line[x_] :> {Arrowheads[Table[.08, {8}]], Arrow[x]}

This might be becuase of Maple history, where different people write different packages and then they all just put togother in one system. 

fyi, I get this error in Maple 2015.2:

Also clicking on "right-click" to execute botton did nothing.

@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.