# Items tagged with commentcomment Tagged Items Feed

### Numerical instability with abs function...

April 27 2010
0 4
Hi, recently I posted a question regarding the problem that by calling same procedure with same parameters I was getting different results. http://www.mapleprimes.com/forum/function-in-maple-returns-me-different-results#comment-10172 I was playing little bit more with this problem and I found another problem / bug. If I define generalized Gaussian probability density function and set parameters such that it is Gaussian probability density function (definition involves absolute value), my procedure returns number in order 10^131. If I call the same procedure with normally defined Gaussian probability function (definition does not have absolute value), the function return 0.7, which correct results.

### Maple Mentor Award winners for September...

April 27 2010
0 7
We are pleased to announce the first winners of the monthly Maple Mentors Awards. Jacques Carette and Robert Israel will receive a prize of their choice to thank them for their involvement with the MaplePrimes community. Jacques has consistently been a valuable member of MaplePrimes, posting clear and insightful information on advanced topics. Robert in particular has been active in the Student Forums on MaplePrimes since their inception and we would like to recognize this. One member had these comments on the two:

### MULTIVARIABLE CALCULUS...

April 27 2010
0 0
I recently posted to the Applications Center a set of class notes and a solutions manual for the exercises to accomany a course in Multivariable Calculus. These notes are a result of teaching this course for the last number of years to Engineering students at NSAC and they have found them to be benificial. I am interested in any comments and/or suggestions on how they could be improved for later editions. Link to Application on Maplesoft App Center

### Maple having problems properly optimizing a functi...

April 27 2010
0 5
Hi, I'm having a problem optimizing a function using Maple. To be perfectly honest, it took me quite a while to realize that the problem was with maple; as it stands, changing the limits of optimization affects the final answer, despite the maxima always remaining between the limits. That is to say, given a function whose maxima is at, say, x=5, trying to find the maxima between the limits 3-9 gives a completely different than finding the maxima between the limits 4 and 6. This isn't a poorly behaved function, as evidenced by the attached graphs, so I'm at a loss to explain this behaviour.

### Missing help page about 2D math input in MaplePrim...

April 27 2010
0 2
Hi, When I click on the link titled 'here' in "Post a new comment" -> "Input Format" -> "Filtered HTML" -> "Allows use of and tags to enter 2D math here for help", I get a blank page http://www.mapleprimes.com/node/add/about/posting/math Does anyone know where I could get the relevant information? TIA, -- Jean-Marc

### Suggestions for some Help pages in Maple 11.01...

April 27 2010
0 8
I've submitted to Maplesoft some suggestions for Help pages in Maple 11.01. A copy is online, and comments on it would be welcomed: View 4119_HelpSuggestions--1101.mw on MapleNet or Download 4119_HelpSuggestions--1101.mw
View file details Note that the document is “live”—i.e. if the cursor is on an italicized word (preceded by “?”), and you press Enter, then the Help page comes up.

### Odd output when solving ODE set, "table"...

April 27 2010
0 3
Hello, I was curious if someone could enlighten my on what's going on here. I put together a set of ODE's and solved them. I then went back and changed some of the parameters, but not the form, of the ODE's. The output of my ODE set now has a "table" comment in it, and I don't know why. For example, one of my initial ODE's is: XMB; (diff(V(t), t))*X(t)+V(t)*(diff(X(t), t)) = .3*S(t)*X(t)*V(t)/(.1+S(t)) after I change some of my parameters, I get this as output: XMB; (diff(V(t), t))*(table([inlet = 0]))(t)+V(t)*(diff((table([inlet = 0]))(t), t)) = -0.1e-1*(table([inlet = 0]))(t)+.3*(table([inlet = 1.0]))(t)*(table([inlet = 0]))(t)*V(t)/(.1+(table([inlet = 1.0]))(t))

### Introducing Maple Mentors Awards...

April 27 2010
0 10

MaplePrimes couldn’t exist without the generous contributions of many talented users. They answer others’ questions and post their own valuable insights and experiences for the rest of us to benefit from. In many ways you are true mentors. The MaplePrimes editors would like to acknowledge their contributions and to encourage others to be inspired by their leadership. We will be awarding a series of prizes for exceptional and continued contributions to this site.

### Entering text into the body of an edit or reply. P...

April 27 2010
0 7
While posting an initial question is not problematic, when editing or adding a comment thereafter, one is presented with a box in which to compose that is partially concealed by content at the right of the screen, e.g., Active forum topics and Recent comments. One can continue to type behind the veil and have it display fine in the preview, but this seems anomalous. I have noted it on two different computers. Do others have this problem? Is there a way to work around this besides truncating ones sentences with early returns?

### New animations by Andy Gijbels...

April 27 2010
0 0
I, Andy Gijbels, added 2 new applications on www.maplesoft.com * Tower of Hanoi: Graphical solution (animation) * Double spring pendulum (animation) Feel free to rate or leave comments Andy

### Removal of Forum Replies...

April 27 2010
0 2
The last comment on this thread Singular Planet needs to be removed. This is Spam and does not belong here. Just thought I would point it out because sometimes things like this get missed. Regards, Georgios Kokovidis

### Plotting a function which contains a (difficult) i...

April 27 2010
0 5
Hello, This is related to my recent posts at http://www.mapleprimes.com/forum/integral-equations#comment-8339 I have a function of three variables one of which is inside a (difficult) integral. I want to calculate & store the array of points which satisfy the function, then use transform to change those points and then plot them. The function looks like this: P:=(x,m)->sqrt(x)/(sqrt((x+m)^2-1)*(x+m+sqrt((x+m)^2-1))); IntegralP:=(m)->Int(P(x,m),x=0..infinity); f4A:=(beta,Omega,m)->beta^2+(3*(beta*Omega)^(3/2)*evalf(IntegralP(m)))/(4*2^(3/4))-1; In my earlier case, m=1 (and there was another variable, but it wasn't under the integral) so the integral was not a problem. I tried the same method;

### Tip: Transpose a pair of indices of an Array...

April 27 2010 Maple
1 14
A note added: Although the coding below is correct, it has clearly been superseeded by the following two entries contributed by acer: Entry 1 and Entry 2. As in any fairytale (even though this blog of mine certainly is not) it takes three of something (at least according to the fairytales of my fellow-countryman H. C. Andersen). Todays entry is the third and last (at least for now) in a row of three consecutive ones dealing with manipulations of indices of Arrays. The other two entries are Tip: Index an Array and Tip: Permute the indices of an Array.

### Tip: Permute the indices of an Array...

April 27 2010 Maple
1 0
A note added: Although the coding below is correct, it has clearly been superseeded by the following two entries contributed by acer: Entry 1 and Entry 2 in the blog entry Tip: Transpose a pair of indices of an Array. Yesterday I wrote about a method to index an Array, using a procedure of the type `index/method`. Below, using the same sort of procedure, a method for permuting the indices of an Array is given (please feel free to suggest improvements; probably, the else-statement may be written more concisely):

### Curve colours in 2-D plotting...

April 27 2010 Maple
3 5
I'm finally going to start my MaplePrimes blog, and I will post answers to some of the questions I get about the areas with which I'm familiar. Most of time, I get asked about 2-D plotting. Some of the information here may be repeated from forum comments, but hopefully, this will make it easier to find. Unfortunately, my participation on MaplePrimes comes in spurts, as I try to find time between my other tasks, such as developing features for new releases. I tend to rely on the many Maple experts on MaplePrimes who very competently answer most questions that arise. I will, however, try to be diligent about adding a new tip at least once a week. Let's see if I can live up to my promise and get beyond this first post!
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