Re: Re: Re: Using Mathematica notebooks in presentations?

*To*: mathgroup at smc.vnet.net*Subject*: [mg97821] Re: [mg97739] Re: Re: Using Mathematica notebooks in presentations?*From*: "David Park" <djmpark at comcast.net>*Date*: Sun, 22 Mar 2009 05:50:53 -0500 (EST)*References*: <26950939.1237537945583.JavaMail.root@m02>

Alexei, If Mathematica notebooks won't properly import the externally produced avi files then, when giving talks, why not have just two applications up: a Mathematica notebook with everything but the avi files, and a PowerPoint with all the avi movies. When playing a movie you could minimize the notebook, and when using the notebook you could minimize the PowerPoint. (You shouldn't usually need more than one notebook.) You have also raised two other questions. 1) How can casual technical users of Mathematica make good presentations? 2) How, within Mathematica, can we make notebooks that hide most of the Mathematica Input and show only the results and mathematics. Classical technical papers don't have Input/Output statements. The answer to (1) is that, generally, casual users who have not achieved a certain level of competence with Mathematica can't make good presentations. They will need help. That is why it is important that Mathematica be more dominant so that students interested in a technical career start learning it young, say in early secondary school, so that when they get to university or into a professional career they won't be stymied with Mathematica. If you will indulge me, I would like to discuss further the writing of graphics and dynamic presentations. There is no one-size-fits-all template for doing this. Each new mathematical concept or each new kind of data set may require its own special treatment. One might end up writing templates but only after exploring the mathematics and/or data. The next topic one tackles might require an entirely different template. And in general, making good graphics and dynamic presentations is WORK. There is no easy shortcut because it is intimately bound with your subject matter. A good source of information and guidance for the graphical presentation of data (he doesn't deal as much with the presentation of mathematical concepts) are the books by Edward R. Tufte: 'The Visual Display of Quantitative Information', 'Envisioning Information' and 'Visual Explanations'. If it takes three books to discuss basically static graphics, separating good practice form bad, then how much more complicated it is to understand the effective use of dynamic presentations! We are at the beginning of a new art and have much to explore and learn. There are some principles, some of them straight from Tufte or inspired by him: 1) Do you have clear idea of what information or concept you are trying to convey with a presentation? This may actually evolve as you work with a presentation. Your first presentations may expose errors or misconceptions. 2) "Maximize the information, minimize the ink." 3) Include ancillary material with the "minimum effective difference". Fewer tick marks, direct labeling instead of legends, barely visible grids. 4) In general, remove everything that does not directly contribute to the message. 5) Most topics require both textual discussion and multiple presentations. Somewhere, but I've had difficulty finding it again, Tufte makes the statement: "The one who makes the graphics often makes the discoveries." That is why it is worth the work. My wife and I are presently reading 'Nerve Endings: The Discovery of the Synapse' by Richard Rapport. It is basically a biography of Santiago Ramon y Cajal, the great histologist and neural anatomist. In a book 'Advice for a Young Investigator' Cajal wrote: "As with the lover who discovers new perfections every day in the woman he adores, he who studies an object with an endless sense of pleasure finally discerns interesting details and unusual properties.... It is not without reason that all great observers are skillful at drawing." Writing good graphics and presentations is an integral part of the learning and discovery process and not just some afterthought, like a wrapping put on a present. In the Presentations package I have tried to tackle the problem of hiding Mathematica code. I'm certain I don't have the final or most convenient answer but it is a workable start. I can present mathematical derivations, proofs, or calculations in a manner that hides all the Input/Output cells (if that is what is desired). Displays can be generated with buttons that can merge with regular text in a text cell. The basic buttons have a structure such that the display can follow the cell or can be launched in independent windows. Derivations can be organized in a structure of buttons that can be arranged in Rows and Columns, or Grids, or Trees. Thus an extended derivation can be presented in a coherent and compact space. The individual 'page' displays can be formatted with a kind of MaTeX language. There is an easy provision for a two column display with annotation on one side and mathematical output on the other side. In can be arranged such that placing the cursor over the output will display a tooltip showing the Input statement that produced that output. I usually put the code that produces these displays in closed subsections that must either be first evaluated or are initialization cells. So the code is there, and readers can look at it if they wish, but it is normally not shown. There is also provision for launching embedded sidebar notebooks for elaborating on some point without interrupting the main flow of the argument. David Park djmpark at comcast.net http://home.comcast.net/~djmpark/ From: Alexei Boulbitch [mailto:Alexei.Boulbitch at iee.lu] Hi, everyone, This discussion has already been held, and positions of two major group are clear: those preferring specifically Mathematica presentations and those preferring generic PowerPoint-type programs. I am following this discussion with a practical interest of a one doing such presentations and having to be alert. However, at present this new discussion is unfortunately kept on the level of personal tests. These tests (as much as I can see from the present discussion) are very much based on personal Mathematica-programming skills. It is not quite unexpected. Those with greater experience in such a programming see no problems to write a peace of code to make a demonstration for the presentation. But in this case this demonstration will be much better suited for the presentation aim. In contrast, those with a considerably smaller experience realize this also, but will have to spend too much time, and presentation will look much less professional. This dominates the decision and I find that the both groups are right. I think that there are also some problematic things that at present in the both styles of presentations. I am going to note now those I met. I hope with these in focus the discussion may help the Wolfram crew in future. The drawbacks of PowerPoint-oriented presentations are well described by math-presentations followers. I agree 100%, and for this reason I will not comment on this any more. Let me instead formulate few narrow places I met doing Mathematica presentations. First let me recall (if somebody have left this out) the Mathematica is intended for everybody, not only for programmers and not even only for those making presentations concerning Mathematica itself. There are also other communities: physicists, biologists etc. A problem with people from those communities is that they sometimes want in their presentations to include items created outside of Mathematica. Sometimes it works, say with simple images, but sometimes it fails. I personally needed to include avi movies created by simulations made outside of Mathematica. I failed, and the Wolfram HelpDesk explained me that not any avi file may be imported into Mathematica. This is a serious limitation. One can of coarse, go around. For example, from Mathematica one may call an external program to run a movie say, by a hyperlink. But this spends too much time before your application starts. It decreases a temp of the presentation. If you need to run about 5 such external movies per presentation, which is not too rear... One may alternatively, have open all windows with external programs that he intends to run, but then he may have too much windows open and lost among them. And this is simply inelegant. I mean that for people who really need such movies run, it is a real problem with Mathematica, while PowerPoint does all this easily. Second important thing is template. Templates of the PowerPoint are primitive, standard, often ugly, but they are there. We have no Mathematica templates for very basic things regularly needed during presentations. For example, one often needs to show formulas and to highlight those their parts that are discussed in a moment. PowerPoint has an instrument to insert formulas, Mathematica has its own also. PowerPoint has no template to accentuate their parts, but using the PP templates this is done in few seconds. In contrast, it took us a long discussion and many attempts and a good peace of programming at this forum about a year ago, to develop good functions to accentuate desired parts of expressions. It is now good though not much better than I achieved in PowerPoint in the past. Ok, once your have such functions, you do it easily in future. However, to make a push to Mathematica-based presentations, (I believe) it would be desirable to have such and some other basic templates already at hand to simplify the work for those who are not that readily programming. Third, if your presentation is not about Mathematica, but you have a lot of code in its interactive parts, you typically do not want to show this code to the auditory. And besides, you have no time to execute the code right before the given interactive demonstration is shown. There is of coarse, a way around. You may keep the whole code in one notebook, and the presentation in another one. This second will then contain the names of your functions just to call them. First of all you need then to execute all functions both from the first and from the second notebooks. You need to write a special function that will do this. Ok, once you have such a function... The next problem is that you often do not need that the auditory sees your functions (or function names) in the SlideShow notebook. Even more, you need to exclude any extra visual information, since it misleads. You need then to make tricks. Say, you may close the cells around interactive presentation, rather than around the function. But like this you lose a control. And it is a considerable peace of work for you right before the presentation. And in this very moment you have typically other things to do. You may make the function names to be simultaneously titles of the demonstrations. This is better, but then there are problems with formatting. However, may I dream that future SlideShow templates would have a button that shows/hides such code-containing cells, and those that execute all functions of the SlideShow? And those switch on/switch off the In-Out tags? No, I understand quite well that some of you may in a second or so write me a nice function that makes the job. I may do it also. I did actually. Nevertheless, I firmly believe that having such things built-in will be a benefit. In general I am much more Mathematica-oriented than PP-oriented talk-giver, and I hope that this discussion may be helpful. Regards, Alexei -- Alexei Boulbitch, Dr., habil. Senior Scientist IEE S.A. ZAE Weiergewan 11, rue Edmond Reuter L-5326 Contern Luxembourg Phone: +352 2454 2566 Fax: +352 2454 3566 Website: www.iee.lu

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