erik10

I have a degree in Mathematics and Physics from the Danish University Aarhus, comparable to a masters degree with thesis - majoring in Mathematics. In 1991-92 I was a visting scholar at UCLA, Los Angeles, following graduate courses in Applied Mathematics. Since 1992 I have been a teacher in a high school (gymnasium) in Denmark. Special interests: Applied mathematics, graphics and popularizing Mathematics.

MaplePrimes Activity


These are replies submitted by erik10

@Ronan Thank you for your suggestion. I actually noticed this page a few days ago when surfing the Internet for the issue. The description on the site is pretty easy to follow. To test it I made the changes in the Register, downloaded the manifest.txt file and placed it unchanged in the same folder as the maplew.exe file, then renamed it to maplew.exe.manifest. Then I restarted my computer. It didn't seem to have any effect.  

Even if it worked, it wouldn't help our school. You cannot tell 500 students, among whom quite a few of them know very little about computers in general, to mess with the register, etc. We have many MacIntosh users too. I can understand though that those Adobe Photoshop users were delighted realizing they could use their software again (most of them). I guess the only way is Maplesoft comming up with a robust solution to this resolution issue. 

Regards,

Erik  

@DSkoog I am delighted to hear, what you say: that the ultimate goal will be to make everything (plots, images, text, math, components, etc.) scale to zoom level. I already did suspect that accomplishing all this will require Maplesoft to do a lot of reworking. Anyway I hope Maplesoft will decide to put resources into accomplishing this task, because the future need it when documents are supposed to be shared on different platforms, not to mention printing/exporting to pdf (which have grave scalable issues at the moment). The more years Maplesoft will push these problems ahead of them while doing nothing, I guess problems will pile up. Besides Maplesoft needs to do a lot of workarounds at the present state, I assume. Thank for being honest about it and not just sweep things under the carpet.

 

Regards,

Erik 

@DSkoog 

Thanks for taking this seriously, Daniel! Not just is it the factory setting (200%), it is also the recommended magnification, as shown on my screen image below (displayed in Danish though):

 

I tested other software installed on my computer. Generally they handle this setting fine. Microsoft to perfection. I only noticed one program (Geogebra) having shortenings in the dialogs. Finally I tried setting text zoom to 100%. The text became so tiny, that it was hardly readable - certainly for people my age. I conclude 200% is the best choice. I almost don't dare to tell that some computers out there go 4K. A 15.6 laptop displaying 3840 x 2160 pixels :) It is really moving fast ...

One question: Wouldn't it be possible to let plots and images display proportionally in a Maple Document on opening it? If so a lot of trouble would disappear when sharing documents!

Again thanks a lot for the reply. I am delighted that Maplesoft is looking into this important issue!

Regards,

Erik

 

@acer Thank you for your comments. I really appreciate it! I am still learning :) 

I am in fact a mathematician and teacher from Denmark. I am not aware of any of my students or other students from Denmark whatsoever having contacted Mapleprimes. No surpise it has happened, though. Actually I think I would advice my students against asking, because most of their questions will probably be of the very simple kind, maybe even confusing the users of Mapleprimes? Maybe a specific 'Student Forum' for Maple users could be useful? I don't know. Certainly there are special Danish characters, but they don't play any big role in problems related to Maple to my knowledge. We try our best to guide our students, when they use Maple. I just hope Maplesoft will make easy tasks easy ...

Regards,

Erik  

@acer Actually inserting images is quite simple as it should be: Just copy/pasting an image into the Maple document using Ctrl+C and Ctrl+V (Windows), so no big thing here. Simple things need to be simple! We use it quite often: The students copy/paste a screen image from a pdf document containing the exercises into Maple. That way the students have the exercises in the same documents as their Maple solutions. Original big images are reduced to small images when viewed on a computer with a big resolution. I don't understand why you apparently don't you see the need for greater similarity across platforms and computers resolutions? 

NB! I noticed one more problem with your recent suggestion: Although the plot was displayed to 40%, the numbers on the axes were almost too tiny to view! 

I am requesting a much more robust GUI. 

Regards,

Erik

@acer Thanks for the valuable input. I didn't know about the possibility of displaying plots proportionally. I tested it and you are right: The document does indeed display plots with a width of 40% - and what is important: It does so when opening the document, no need for reexecution. 

Still it is not enough for the dayly workflow to be sufficient smooth. It requires the user to call the package plots and add the command you mention. Since we recommend our students to place a restart command at the beginning of every new exercise (to avoid interference between exercises), there will be additional work to do, probably leaving the less clever students behind. I am not sure if it will even be sufficient to make it possible to globally set the proportional factor, because you might have plots you want to display at different percentages in the same document ...

What about images, by the way?

Regards,

Erik

@Kitonum 

Absolutely great! I didn't think about the possibility of defining a function, which has a plot as the value. It makes it possible to use the Explore command for this situation too. The code also seems more straight-forward. At the same time I can avoid the oldfashined animate command, which need to generate frames before execution ...

Erik

@DSkoog Exactly! This is what tomleslie apparently can't see. Thank for pointing this out, Daniel. There is no logical reason why it should not be possible to do the same operations inside a Workbook, as it can be done outside. Of course it can be implemented. Here shortly a screenpicture of what I use to do outside any Workbook (neglect my use of a special package Gym):

 

 

I use the menu Tools > Assistants > Import Data. It involves going through a few windows in order to specify what Excel file I am importing and what parts of it, etc. So everything is completely and uniquely specified. So what I am asking for is - as I understand you are recognizing too, Daniel - is to make it possible to access the Data.xlsx file inside the Workbook in the exact same way as it can be done outside. I hope the developers will look into this for the next version of Maple. I know some people prefer a commandline to import data, but why not let it be up to the user?

Erik

 

 

 

 

@tomleslie Thanks, your code works! Although the code is not that bad here at all, I still have the feeling: Why do I have to write these commands, just because I am placing those files inside the Workbook? A step forward and a step backward in my opinion. Hopefully in version 2017 of Maple it will be possible to access the files inside the Workbook via the menus, just as it was without the Workbook! I have to take account of my students too!

Regards,

Erik

@tomleslie Sorry, I will be more specific. I have attached my Workbook_example. It contains an Excel Data filenamed Data.xlsx and the Maple file Exponential fit. Before inserting those two files into the Workbook, I did import data from the Data file into the the file Exponential fit file via the menu: Tools > Assistants > Import Data... as I usually did before version 2016 of Maple. Then I did insert those two files into the Workbook_example file. 

I put the resulting Maple Workbook file in another drive to see if it worked properly. When I opened the file Exponential fit in the workbook and recalculated it using the three !!! in the toolbar, everything seemed to work properly. The file didn't miss the Data file. But then I opened the Data file and changed a count to a big number, saved the file in Excel and afterwards in the Workbook too. So it was saved! Then I opened the Expontiel fit file again and recalculated using !!!. Nothing new happened: It did not take account of the updated Data file.

Then I wonder: Is it another instance of the Data file I have in the Workbook. There seem to be a missing referral to the Datafile somehow. But if that is the case, then how did my first recalculation in the new location work?

I hope someone can help figure this out. I really hope it will not be necessary to use long import commands and Workbook URI to make it work. Using the menues is preferable from my viewpoint ...

 

NB! I needed to save as a zip-file, because Mapleprimes at the moment doesn't allow to upload .maple files!

Workbook_example.zip

Erik

 

 

@acer Thanks for your reply. I now realize the element-wise operator can be used in much more general situations than just multiplication of two lists! Good to know.

What I meant with my second question was if it is possible to solve equations for each item in the list. Lists E and m are given with units. I want a list m with units, which items are the solution to the equation E = 1/2*m*v^2. I know I can isolate m in the equation and use the ~ operator to get the list asked for. It would be nice though, if solve could be applied to each item in the list. NB! Students today aren't that good at manually isolating a variable, so it would be convenient to avoid it, if possible?

Erik

 

@Carl Love Thanks a lot, that solved by problem at hand. I was trying to make many calculations of the same kind at the same time, like in a Excel worksheet. Now for future use, I would like to extend my question.

 

1. question: What if I wanted to make a more general operation on every item in the list, say taking the squareroot of every item in the list, still including units?

 

2. question: Is it even possible making a list of solutions to a certain equation? For example:

E:=[5,12,17]*~Unit(J)

m:=[2,4,6]*~Unit(kg)

and then using the formula E = 1/2*m*v^2 to find a list of velocities, v?

 

Erik

 

@Rouben Rostamian  Thank you a lot for your contribution. I apprciate it. The solution seems very good. I guess then that Least Square is the appropriate method to solve this kind of problem. 

After this succesful solution, let me take the question one step further: Now it might happen that a population is not in Hardy-Weinberg Equilibrium, but still the Least Square method will provide a set of solutions. Let's assume it is decided that the given Phenotype frequencies are subject to some error bounds (it could be absolutely or relative), then is there a way to decide if there are a solution for the allel-frequencies which imply the 'corrected' Phenotype frequencies to be within the bounds mentioned? (and provide the solution)

Erik

 

@jzivku I actually already have contacted support@maplesoft.com, because I didn't get any response from here. I am waiting for an answer at the moment.

Erik

@Preben Alsholm Big thanks! First time I notice this LSSolve command. It works just great! It doesn't matter how many free parameters. Now I only have to consider if I should use it to estimate the elevation, the initial velocity and the Air resistance coefficient or maybe only the latter. By making a combined plot, including the Physical data and the theoretical curve (with "time points" added), I get a very good impression about the quality of the fit!

Erik   

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