@mdenney Much appreciated! 

@ider I wish I knew. This interface problem involving 2D input and a couple of others are so annoying for me that I have not transitioned to 2024.  Fortunately, the problem has been reported to and reproduced by Maplesoft. We hope that with 2024.1, the problem will be resolved. Now, if you come up with a creative solution - please let us know.

However, I cannot tell if we are using the same 2024.0 build. Mine is 1767880. No change in matrix scrolling. 

To @janhard, @mmcdara and @acer - thank you for your contributions to this important topic.

While even I recognize "simplify" has improved during the past two iterations of Maple, this post pushes the project forward. A robust "simplify" procedure has significant pedagogical value.

@Ronan, I believe they are one and the same. See the help page.

@dharr Upvote for using ifelse and not the often mistyped `if` phrase.

Just an FYI, for efficiency considerations, the for loop can be reduced to a seq procedure:

A := [ seq( Matrix(n,(i,j) -> f(i,j)), n = 1..4) ]

where f(i, j) is the function defining each element.  Your mileage may vary. 

@MapleIsHard And that is what one generates late at night on minimal sleep. My hope was to get you started. Clearly, you now have a multitude of Maple solutions. I hope you found them mathematically and conceptually educational. 

As a like-minded educator, I thought you might be interested in an alternative approach to this problem. It simplifies some of your work and provides the code to create a "What If" app through the Explore procedure. IMO, the Explore procedure is the most pedagogically valuable Maple procedure for complex problems like yours. 

SIR_simple_vaccination_example_suggestions.mw

Upload your worksheet for assistance.

@mr_picky  Have you looked into the application center?

https://www.maplesoft.com/Applications/

It is not specific, but you might find it handy for other projects. 

@mr_picky To upload your worksheet, hit reply and then hit the big green up arrow. Select your file and insert it as a file or as content. 

It is very difficult to work with the worksheet printed the way it is above.

@mr_picky, I just want to point out that sum is a great procedure. And, it works with the Sigma symbol which I prefer to use. (I swear, it seems like the folks at Maplesoft seem to make it smarter with every release, even if they say it does not.) 

 However, sum is designed for symbolic summations. Here, you want to add values. Hence, this is when you need to use the add procedure. 

https://www.maplesoft.com/support/help/maple/view.aspx?path=sum

https://www.maplesoft.com/support/help/maple/view.aspx?path=add

@acer As I said, there are multiple ways. I prefer to comment while coding using the word Matrix (or Vector or Array). 

Beauty is in the eye of the beholder

If you want to copy matrices, do not simply write

B := A;

Since matrices are "mutable" rectangular tables (rtables), Matrix B will reference A. Hence, any changes to A will be observed in B. There are several ways to make a full copy, but IMO, the most readable is to create a Matrix out of A:

B := Matrix(A);

@goebeld ,  @dharr has nicely answered your questions, particularly about "<", ">" brackets. 

Since you are a new user, you might find the series on learning Maple that I put together for the new users I teach. In most videos, I type the commands or click the palettes instead of just presenting the output. The video on creating vectors is here, and the one on creating matrices and matrix arithmetic is here.  (I try to limit all videos to 12 minutes. One of them got away from me. 😕 )  Each video comes with an associated document if you prefer to read than watch. 

The entire series can be found on the website: gould.prof/learning-maple.