As many of you have experienced, the maplet MathMLEditor, has some problem when it comes to interpret correctly the typing functions, even some functions with the help of the palette.

I was trying to input this function : sin(4*x)+cos(2*x) but after moving form the unknown tag _XML_ error, I end up with misinterpretations of this function, to things like 4*sin(x)+cos(2*x).

So, the comments in this blog tells that the better solution is to use a TextField to get the input function, but now I face this problem

f := Get('txtFunction');

My oldest son, Stuart, recently completed a Science Fair project on sudoku puzzles. While I am fairly good at solving sudoku puzzles, the mathematics is something that is completely outside my area of expertise. After seeing the paper by Hurzberg and Murty in the Notices of the AMS (June/July 2007) and additional papers by Felgenhauer and Jarvis (http://www.afjarvis.staff.shef.ac.uk/maths/felgenhauer_jarvis_spec1.pdf) and Russell and Jarvis (http://www.afjarvis.staff.shef.ac.uk/maths/russell_jarvis_spec2.pdf) and Jarvis' sudoku webpage (http://www.afjarvis.staff.shef.ac.uk/sudoku/), I felt that I had a reasonable understanding of some of the basic ideas involved in counting unique sudoku puzzles. While I had nothing to add to the mathematical ideas, I did see the potential to create a tool to visualize these ideas. The result is the worksheet I just uploaded to MaplePrimes:

View 178_Sudoku3-20-03-08.mw on MapleNet or Download 178_Sudoku3-20-03-08.mw View file details

Does anyone here use this?

Would it be useful for someone new to topology/homological algebra learning wise ?

comments/opinions very welcomed.

thanks,

dc

http://wwwb.math.rwth-aachen.de/homalg/

The e-mail notification feature that was previously available before the last update to the site has been re-enabled.

Please post any issues with this feature as comments on this blog entry. If you have comments about any other features, please add them to the MaplePrimes Suggestions forum

I used to receive emails each time when a comment/reply was made to my questions on mapleprimes. Very convenient. Now this service either stopped to exist or something else, as I receive nothing. Can it be resumed somehow? Thanks.

probably I should not have written my question as a comment here http://www.mapleprimes.com/forum/how-to-evaluate-faster, si I now put it as a new topic. Thanks for your time and help.

The problem is to evaluate as effectively as possible an n-fold sum of N additions, e.g., for n=3

FF := proc (N) options operator, arrow; evalhf(add(add(add((1/2*1/3*1/4)*(1/2)^j*(3/4)^g*(2/3)^i/(.4*i+.4+.1*j+.1+.3*g+.3), i = 0 .. N), j = 0 .. N), g = 0 .. N)) end proc

John Fredsted suggested using the following procedure (slightly modified) to determine whether an expression was deeply algebraic.

isDeeplyAlgebraic := proc(x) if not type(x,'algebraic') then false elif type(x,'atomic') then true else andmap(procname,x) end if end proc:

TypeTools:-AddType('DeeplyAlgebraic1' , proc(x) if not x :: 'algebraic' then false; elif x :: 'atomic' then true; else andmap(type,x,'DeeplyAlgebraic1'); end if; end proc);

My humble work - CubicRubik Maplet. Interactive Game of ordering CubicRubik.

To run it - download library from http://www.mapleprimes.com/files/8024_CubicRubik.mla/a>

In working out the procedure isDeeplyAlgebraic in the post Deeply algebraic, I was trying to use something like `and` and `or`, analogously to `+`, `*`, `.`, etc.

isDeeplyAlgebraic

`and`

`or`

`+`

`*`

`.`

In the thread An easy way to plot the region between two curves there are several pictures which are externally stored, i.e., they have not been uploaded to mapleprimes, but instead the sources of the images point to some outside site.

That should work, I think, but it does not, at least not where I am sitting. I see some Chinese looking art with http://blog.163.com/ (the external site at which they are stored, I assume) at the bottom of each picture.

I need to answer a question, using maple, mathcad, or a similar algebra solver.

I have a little experience in Maple, and thought it would be easy, buts its not, here is the question.

The question is

-----

Let P and Q be two points in the x-y plane with coordinates (1,2) and (1,-1) respectively with respect to an origin O. Express OP, OQ and QP in the form Ai + Bj where A and B are scalars. Let R be a point on OP so that OR = 1/3OP . Find OR and QR in terms of i and j .

I have no idea how to do this.

Example: http://www.mapleprimes.com/blog/jacquesc/maple-12-wish-list

Currently, with "Comment viewing options" set to 50 (the default), I see 6 comments in the 2nd page, but clicking on their links on the block "Recent Coments" send the browser (Firefox) to the top of the first page.

Could you solve this problem?

A procedure named curve(x) in the attached worksheet solves several equations, each dependent on the solution to the previous equation. The problem is that when I issue the plot command for a range of the dependent variable x, the equation result that gets plotted is not for the result of the solution to the last equation for P. Specifically, I would like to issue the "plot(curve,0.0..0.5, <other format commands>);" and get a plot of k vs. P. Currently the plot is of k vs. P_bar. Your comments are appreciated.

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