@YasH How can one use your function and also effectively use plot option discont; i.e., how can one avoid the vertical lines at the discontinuities? There seems to be a subtle distinction---which I can't yet make precise---between functions for which discont will work and those for which it won't. I can't make it work with your function.

Another thing that I like about the new editor is that I can copy-and-paste plots direct from a worksheet. That's much easier than uploading a file.

@nika The chi-squared test won't tell you a suitable distribution. It'll only tell you whether or not the normal distribution is suitable. If the test fails, it tells you nothing.

@vahid65 How about

plots:-animate(
    plots:-polarplot,
    [[[r, 0, r= 0..1], [r, 9*Pi/4*k/50, r= 0..1]], color= magenta],
    k= 0..50, thickness= 6
);

@Mihrab Oops, I changed the parentheses from your original. My command should've been

plot([seq(-arctan(2*m*x/(1-x^2)), m= 1..10)], x= 0..10, discont);

@tomleslie You're right that I was too quick to say that those were the first 10.

@ETM1697 So, does f[x] mean the derivative of f with respect to x?

The comment below pertains to the originally posted form of the equations:

Your formulas are not clear enough. Obviously, they weren't given to you in the form above in your instructions. Please use square brackets to indicate subscripting, for example, the left side of the first equation almost certainly should be x[i+1]. I think that you're missing paretheses also. And why do you have both asterisks and centered dots? Do they both represent multiplication?

@Joe Riel I think that what he wants is a programmatic control so that his program's output appears in an otherwise empty window. Unless his output is strictly a plot, this'll require either some sort of embedded component or a Maplet.

All of your functions are functions of a single variable, so it's not clear what you mean by 3D. They could be done as a single 2D plot if you want.

@DSkoog wrote:

• I do often see a lot of other stack users redirecting questions to MaplePrimes when an 'expert' answer is required, which speaks volumes about our community here.

I think that that's almost always me who says that. There are several reasons that I might say that:

1. Yes, I know that there are some experts on MaplePrimes who aren't answering Questions on math.stackexchange or stackoverflow. (Please let me if there are other StackExchange sites where Maple is discussed.)
2. I may see that the Question is primarily about Maple rather than about math or programming. The moderators are very strict. If the discussion becomes primarily about Maple, it gets shut down, usually within hours.
3. Indeed, I often write that because the discussion has already been shut down by the time that I see it. At that point, Answers aren't allowed, but Comments are, so I put in a Comment like that.
4. I'd like to Answer the Question by displaying a worksheet.
5. StackExchange sites are strictly Q&A. There's not much room for the back-and-forth discussion that's often needed to reformulate the Question, nor is there much room for followup questions. A Comment on a StackExchange site is very limited is size and 2D display ability.

So, while an exclusively Maple site would be a welcome addition to the StackExchange portfolio, such a site couldn't be a replacement for MaplePrimes. What I want is for MaplePrimes to adopt the look and feel of a StackExchange site while still being MaplePrimes: There'd still be Posts and room for extensive back-and-forth discussion. By look and feel I mean the fonts, spacing, clickable controls, notifications, timers, and indexing, among other things.

@nm Of course I have thought of that, and I've looked into it a little. IIRC, they require a core group of at least 200 dedicated and regular users. I'd guess that we have about 30-40 here. Nonetheless, I could submit a proposal and see how many votes it gets. 

An aspect that would require some expert programming is the displaying of uploaded worksheets.

Update: It seems that the core group of 200 users is no longer a requirement. The requirements are in the link that dskoog posted immediately above.

@johan555 Is your expession derived from a norm by Maple, or by hand?

If DirectSearch:-GlobalOptima is returning a negative value, then you should be able to take the evaluation point that it gives you and easily check that all constraits are satisfied and that the function value is negative. I suspect that you are missing a constraint. 

@AmirHosein Sadeghimanesh 

Why not just switch to 1D input?

@Joe Riel Why is it safe in this case to use a remember table with mutable arguments such as records (which are a form of module)?