Kitonum answered it, then the OP said it looked like this and showed a graph that was shaded blue to red.  I commented on it this morning saying instead of I think a rainbow of color changes that he wanted following the ROYGBIV color scheme.  Later the whole post dissappeared. 

I think someone has mistakenly deleted it, or accidentally identified the user as spam? 

I believe this is the post here https://www.mapleprimes.com/questions/225497-How-To-Plot-Contours-streamlines 

.. however the link is broken /deleted.  Mapleprimes going to bring it back?  Maybe a server failed at Maplesoft?

@unproductive Ok, what is it you are trying to do in Maple?  We can easily help you if you give us some examples of what you are trying to do.  Give us something to solve for you and someone will more than likely offer you a solution.

Since you need far less functionality than Maxima.  Maple is more than capable of doing that.  So far the only bit of useful information I can gather from your posts is that you want to make some kind of anonymous function or procedure?  Below is also something you were trying which I'm unsure of since also I don't use Maxima.

lambda([f], lambda([x], [f, x]))(g)(y)

@unproductive Alonzo church - An American mathematician. Not sure what difference it makes if he was open on your desk or not, nor what it has to do with you googling "maple anonymous procedure".  Since you said you googled maple anonymous function and the first thing you saw ended up killing maple.  This is fake news because the first thing that comes up is

Firstly what does the 100 source code pages of functionality from Maple mean?  What discovery did you make?  I can't believe this but I'll ask .. are you writing a thesis paper?

Hey, that's pretty cool, works well with two images.  I wonder if it's possible to work with 3 images?  That is close up you see one image, 5 ft away the second image and then farther away the third image.

@unproductive .. you mean you googled "maple anonymous procedure"

Actually I've had this happen before but it isn't just Rouben, it's happened a few times when I came across a searched link - it didn't link properly.  I can't recall but I always thought it was just related to some posts or questions that had been moved and were no longer linked properly when mapleprimes went from 1.0 to 2.0. 

@basha 666 This is an interesting thread.  Is this a fluid velocity field you're trying to create?  It's not entirely clear but it looks like you are wanting to create streamlines?  The use of the word "contour" may be confusing.

For clarification the examples you are linking I think are from Kitonums answer here https://www.mapleprimes.com/questions/143152-Stream-Lines-Plot (I can't see the plot in this thread from where I am but I'm pretty sure it was there when I looked at it last night) or it might have been this link https://www.mapleprimes.com/questions/212138-How-To-Plot-Stream-Lines

Sum doesn't evaluate the expression.  However SignalProcessing package does, it changes the way Sum works and works on an Array. 

Unless you mean to use sum instead. 

@asa12 With Maple 12 I don't think it can be done inline (and I think you mean not to manually adjust the graph with the mouse and resize the zoom level).  As far as I know one way is to at least output to a file using the plotsetup option. 

See the plotsetup option on the help page for an example.

"Maplesoft will continue to develop and support Maple, MapleSim and their related products"

Well I should hope so, as far as I know the flagship of Maplesoft is Maple and MapleSim.  So I'm not sure why such a statement should have to be made? 

@Kitonum Should maple automatically interpret a multiplication of two vectors as a dot product?  In the case of this situation above where the op wanted to multiply but didn't get an output, but now understands to use the . instead of *

@John Fredsted nice coding but do you mean to write,

find:=(m)->map(x->`if`(lhs(x)=m,rhs(x),NULL),ListTools:-Flatten(convert(zip(`=`,M,N),list)):

Using the code you provide we get this error

So Flatten is required.

@Markiyan Hirnyk .. Cryptography comes to mind.

@vv can you explain the reasoning for this part of the code?  What's the purpose for b?

**edit added**

removing b and modifying the piecewise(r<p,[3,0],r>p[0,3],[1,1]) alleviates the problem of 0 rated teams making it into the knockout round. 

WORLD CUP 2026 will have 48 teams - 16 groups of 3.  Each team playing each other once means they only play two games.  So theoretically all teams in all the groups could all end up with 3 points each meaning there will be a lot of tie breaking decisions to be made. 

Now that we're almost halfway through the group stage a four teams have already been knocked out.

Morocco, Egypt, Saudi Arabia and Peru

However setting those teams ratings to zero in the simulation, they still somehow manage to make it to the knockout round (albeit a small one).  How can I adjust the code to make their probability of making the knockout round zero?