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Maple 12: 2D Math cf 2D Input w RREF

Posted on 2008-05-21 23:12 By woodwise (Maple Rating 1 65)
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I have been trying to discover the difference between 2D Math and 2D Input. Help details /how/ to use them but not /why/.

I enter material as 2D Math, and sometimes it gets changed to 2D Input.

In the attached doc, I see no difference between the declaration for Sx and d, yet Sx seems to have values and d does not.View 1292_2D Math cf 2D Input w RREF.1.0.0.mw on MapleNet or Download 1292_2D Math cf 2D Input w RREF.1.0.0.mw
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That may explain why the RREF does not work???

~Rich~

‹ Maple 12 Installation error Displaying 3-d pointplots and animations ›

d has values

Comment on 2008-05-21 23:52 from jakubi (Maple Rating 4 943)

and RREF works: View 143_rref.mw on MapleNet or Download 143_rref.mw
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From my point of view, this document mode is a source of confusion, as its purpose is to hide "details". If I were you, I would use worksheets and 1D input.

Maple 12: 2D Math cf 2D Input w RREF

Comment on 2008-05-22 08:15 from woodwise (Maple Rating 1 65)

Thank you for looking at my question. I am puzzled by "as its purpose is to hide "details"". This is exactly the same method that I used in Mathcad to accomplish the same goal. I am trying to learn Maple. If you mean that the 2D input is hiding details, then I don't understand how. If you mean that I have tried to hide details, I am again puzzled, because all the steps are there.

1. When I first opened 143_rref.mw I could see what you had done. Then I executed the whole doc with !!! from the menu. Eq (5) originally showed numerical values. After executing the doc, the result in Eq (5) displayed symbolically, as in my original doc. Is there something that I have done to configure my copy of Maple to confuse it?

2. Even after executing the doc and getting the changes in Eq (5), the last line in your doc, ReducedRowEchelonForm(M) still produces a matrix of numerical values, which is my goal. It seems clear to me that M has numerical values or the rref() would not work.

3. I copied the commands that you included in your doc to my doc. Thank  you for showing me those. Curiously, this morning, both docs work the same way. I now can see the results of the rref(), Eq (8) in my doc, but not the numerical values in the assignment to M, Eq (7) in my doc. I have included images from Mathcad to show how I am testing the same in both products.

View 1292_2D Math cf 2D Input w RREF.1.0.1.mw on MapleNet or Download 1292_2D Math cf 2D Input w RREF.1.0.1.mw
View file details

~Rich~

http://pubpages.unh.edu/~rlo9/index.html

Only a quick observation

Comment on 2008-05-22 17:21 from jakubi (Maple Rating 4 943)

right now. The Standard GUI has many options to hide/show things. May be that your setting is different to mine. Look at Tools > Options > Display. Eg. I have "Display output from Evaluate (Document Blocks)" checked.

Hidding. Some statements available about its purpose.
Eg here:

An important decision when creating any technical document, presentation, or application is the amount of technical detail. With Maple 10, your important points are not hidden amongst derivations, commands, and extra white space. You can hide intermediate computations, show results in the middle of a block of text, and not enter or show a single Maple command.

And here

The second method is to display the result, following the input expression and to display, between the two, a short text or symbol (e.g., an arrow) that describes the operation that was applied. This makes the document visually appealing and close to what one would expect to see in a mathematical textbook. There is no textual command or syntax that may be a distraction from the actual content that the document is supposed to convey. The disadvantage of this method is that, although the exact semantics of the operation can be preserved behind the scenes, in order to automatically update results if the input changes, the semantics of the operation are not obvious to a reader of the document. Because the presentation has to be visually appealing, the description of the operation has to be more casual or imprecise.

 

I think that in practice, things are more complicated and confusion may arise. So, I find that it is much easier to learn Maple using worksheets.

 

Maple 12: 2D Math cf 2D Input w RREF

Comment on 2008-05-27 08:45 from woodwise (Maple Rating 1 65)

Ahh. Now I understand. Thanks for your insights there. I also found some pages that I didn't run across using the Help TOC. I eventuall discovered that I could get there by searchng on "documents" and choosing a one of the items lower on the list. I get the impression that the Help is extensive, but a bit difficult to use until one gets to know how to search it. I see now that Math, Math Input, and Math Output are different, and are treated as different by Maple, but I think I must learn better how they differ.

~Rich~

http://pubpages.unh.edu/~rlo9/index.html

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