I just wrote up a bug report (aka "Software Change Request") but got a "We are currently experiencing technical difficulties" error so the report is not being sent.

I will just post here about the bug in case anyone knows what it is.

I am going through the Multivariate Calculus Study Guide. I went to section 1.1, and was going through the examples. At the end of an example is a link "Next Example", but when I click this I get an error and have to go back to section 1.1 Table of Contents. Kind of annoying. Also, I notice that Maple simply crashes seemingly randomly when going through this study guide. Very annoying.

Here is a screenshot of the write-up to the bug report service that isn't working, for the record

I was wondering if this is something wrong with my Maple installation or if other people experience it too.

I was just trying to follow along the Multivariate Calculus Study Guide.

There is an example where we are supposed to plot a "rooted vector". Basically, a vector where the tail is not at the origin.

The commands seemed pretty straightforward but are not generating the expected results. Here is a worksheet with the commands in question

Well wouldn't ya know? I am finally able to execute a worksheet in this question box. As you can see there is no vector being displayed. Now, after playing around with the values a bit, it seems that the root that I chose, [-2,1], seems to be the only one that won't work. In particular, the value 1 there seems to be problematic. If I use any other value (including for example 0.9999999), the vector seems to be drawn correctly. 

Why doesn't it work for the original parameters I chose?

Download PlotRootedVector.mw

Is there a command to generate a second-difference matrix of size n by n?

This matrix has 2s on its main diagonal and -1 above and below each main diagonal element.

This is a follow-up to a previous question I asked that was answered with code that used "%.". From the documentation I can see that % is a nullary operator that gives us the value of "the last expression", which I think means the last result of an evaluated expression.

In my previous question, I wanted to be able to display for example, a constant times a matrix, without the product being evaluated.

For example, given A:=<1,2;3,4>:, we need to use Maple Input, and then we can write c__1.A and the output will be an expression that has c__1 then the dot product symbol and then the matrix A written out.

My question is simply: what exactly is "%."?

I would like to display an expression that is a matrix, the dot operator, and another matrix. That is, I want to display a multiplication of matrices, without the multiplication being evaluated.

Something like

<1,2;3,4> '.' <6,7,8,9>

Is this possible?

Here is some context around why I want to do this. Perhaps the main reason I use Maple is for the symbolic math capabilities using 2d math input. I want to create worksheets that look like what I would write on paper. 

For example, let's say I have a matrix that is defined by <I, F;0,0>, where each of elements is actually another matrix. I want to multiply this matrix by its transpose, which would be something like <I, 0^T; F^T, 0^T>.

I would like to display <I, 0^T; F^T, 0^T> .  <I, F;0,0>.