Some changes are coming to MaplePrimes!

The following is strange. By acting on an equation label (in the Standard GUI) a subsequent global reference gets printed as if it were a module reference.

> restart:

> x:=ScientificConstants:-Constant(c);
                              x := Constant(c)

> ScientificConstants:-GetValue(x);
                                  299792458

> y:=:-Constant(hbar);
                             y := Constant(hbar)

> ScientificConstants:-GetValue(y...

Not all objects can be saved to .m and retrieved sucessfully in a restarted or new session. This is the case not only for "escaped" locals, but also for some objects implemented as function calls of a module member.

> restart:

> t := ScientificConstants:-Constant('c'):

> type(t, specfunc(anything,ScientificConstants:-Constant));
                                     true
 
> ScientificConstants:-GetValue(t...

Is there a way to disable the evaluation of an expression in a working page. For example:

x=1

y=2

z=x+y

I'd like to have y=2 not evaluated. Instead of deleting that line, is there a way that I can indicate to Maple to skip line 2? Many thanks.

Chin Li

Is the "math" typesetting in the forum working? Example Sum((-1)^n/n,n=1..infinity)

It’s been nearly ten years since I first walked onto the University of Waterloo campus as a freshly minted undergraduate, bright-eyed and bushy-tailed and eager to learn all about electrical engineering. I guess it’s hard to believe the speed with which time passes. It’s actually a bit astonishing how much I can still remember about orientation, or “frosh” week, like 4 a.m. fire drills, a very messy obstacle course, sitting with 800 other young engineering students in a lecture hall, and above all, meeting new friends.

I used to really enjoy reading mapleprimes and answer questions.  It was fun.  There were challenging questions, and some rather interesting design discussions.

And then I got bored.  I am not totally sure exactly why.  In some ways, I think the density of challenging questions went down.  Well, that's perhaps not quite right either -- the density of new (challenging) questions went down.

AUTHOR: Fereydoon Shekofte v := ImportMatrix("F:\\xyz.txt", source = delimited, delimiter = " ", format = rectangular, datatype = float[4], transpose = false, skiplines = 0) c := ImportMatrix("F:\\face.txt", source = delimited, delimiter = " ", format = rectangular, datatype = integer[4], transpose = false, skiplines = 0) MatrixOptions(mi("format"), 'order = C_order'); mi("format") f := Array(ArrayTools[Reshape](c[1 .. 3864], 1288, 3), order = C_order) plots[pointplot3d](v) p := Array([seq(geom3d[point](p || i, v[i, 1], v[i, 2], v[i, 3]), i = 1 .. 1063)])

I am using maple 13.

Regardless of the doccumentation I hunt for, the help window opens and in the main window it states "No matches found."  For instance, the ?plot and ?sign commands do not return any documentation.

This started after trying to use library tools to save and retrieve data.

I have restarted the program in a black worksheet to no avail.

What should I do, and how do I avoid this in the future?

Thanks!

Jacques,

[reply to this post]

I know a lot of the history of Axiom (having had many talks about it with James Davenport over the last 6 months), NAG, Maple, etc.

What about if, as result of those talks, you (both?) write a comparative review about the main design ideas of either system and their impact on past and future development?

I noticed that highlighted text in a recent submission of mine was changed to hyperlinks to Maple help pages, which is much nicer. Is there a convenient way that I can do it myself?  Ideally that would entail selecting the name and then clicking a "make link to Maple help page" button (i.e. it should be just as easy as making it bold text, which is what I originally did).

Recently, we were asked by a designer of thrill rides if we could help them define a design tool that would allow them to push the envelope in rider experience, while considering engineering constraints and, of course, rider safety.

Hi all,

This week I decided to do some research and find out the details of how to make model animations with MapleSim, by adding in CAD drawing files of the component parts. To see what I mean, take a look at this quick animated movie that shows a robot arm with five degrees of freedom:

At the recent Vehicle Dynamics Expo in Stuttgart, I presented an example that demonstrates the speed with which you can perform the complete model-development-to-HIL process for a vehicle stability controller using MapleSim. The process begins with the development of a full-chassis vehicle model in MapleSim. This is a detailed model that includes the geometries for a double-wishbone suspension at the front and semi-trailing arms at the rear, with Fiala models for the tires. The stability controller, or Electronic Stability Program (ESP), is a predictive model based on a simplified vehicle model (referred to as the “bicycle model” since it only uses one wheel at the front and rear). When activated, the controller estimates what the desired yaw rate should be from the simple model, compares this with the actual yaw rate, and applies a braking force proportional to the difference to the appropriate front tire.