@ijuptilk You should provide a link to your revised worksheet with the changes to the x-axis range that your Question mentioned in a later revision.

Otherwise people might edit it in different places than you intend.

@Ronan If I make the target a valid .xlsx (Excel) file then on my Maple 2021.2 for Linux it opens the file in Libre Office when I click the link. And for a .png image file it opens in my machine's image viewer.

I don't know how your machine handles (or allows configuring of) file associations.

@Dkunb I'll have to wait until tomorrow to get a moment to answer your query about the details.

How long did your original grid=[25,25] contourplot take? How long does the above approach take? Is it adequate?

@Ronan Within a string a single backslash denotes that the next character will be escaped.

So use a double backslash (on MS-Windows) to get an effective backslash. (Or four, to get two, etc.)

That's not a Maple specific thing. (See here, here, etc, etc.)

I was just able to submit a new Question, and edit its text body.

(I've since deleted that test submission.)

@Carl Love Thanks.

Perhaps that means that somebody has edited the Question's body and defaced it by removing the original example.

I hope it wasn't the original poster. Deleting one's own question -- after anyone's spent time looking into it -- is very inconsiderate behaviour.

@Carl Love Where is the question?

@Rouben Rostamian  

That obtained solution procedure U only allows requests for arguments within the (earlier) specified range. Ie,

  U(-1e-5, 0.5);
    Error, (in solnproc) requested y value must be in the range HFloat(0.0)..HFloat(10.0)

And the call -D[1](U)(0,0.5) invokes fdiff to approximate the derivative numerically. It uses a simple symmetric differencing scheme with h=Float(1,-Digits/2), and thereupon attempts to call,
  U(-0.5e-5, 0.5)
which throws that same error. That error is caught and absorbed, in this situation.

With default working precision you could get this approximation,

  -D[1](U)(0.5e-5,0.5);
                    0.5443737835

Of course one is free to approximate the derivative manually, in some other fashion.

@MalakMMK You should show us all that you've done.

You can upload your worksheet using the green up-arrow in the Mapleprimes editor.

@Carl Love I thought those produce 1x3 Matrices. The OP asked for row Vectors, so I rejected those ways.

(I too concocted those ways, at first. And I thought that I'd checked them, in Maple 2022.1, ... but perhaps I missed something.)

@MalakMMK Did you look where (and how) I used either a simple iterative formula or a few iterated steps?

That is, using u[i], v[i], and u[i+1] instead of, say, x[n], y[n], and x[n+1].

Have you tried adjusting the formulas yourself?

Is this work for an academic course or project?

@MalakMMK I don't understand what you're trying to say.

@mmcdara Sure. Tabulate is just an easy-to-use front end, for some common situations.

Tabulate is built from those lower level DocumentTools widgets&things (Layout & Components), of which you've shown an example. Naturally, one can build more flexible or targeted applications from those, for specific situations.

@tomleslie The OP stated, "Note I want to monitor points during the loop running not after it finishes.", and what you've shown doesn't provide that.

@vs140580 Please add your very close followup query here, and not in a separate Question thread.