erik10

Dear Maple users

I am having a problem with a simple for loop. I cannot seem to figure out what is wrong. I want to define a number of Random Variables of the ChiSquare kind, with increasing number of degrees of freedom as the figure below suggest. When defining them one line after another everything works well. My idea was then to make a for loop, since I might want many Random Variables defined. It doesn't work however in the way I do it. All...

Dear Maple users

I am experiencing a strange problem with my clipboard. I am using Ducument Mode and when I am trying to copy part of my document using Ctrl+C and place it in the same document using Ctrl+V, then sometimes things are not being copied properly as can be seen on my image below. It is as though the clipboard doesn't pick up the fomatting. When I restart my computer things works fine until a certain point when it stops working. I hope someone can...

Dear Maple users

The formula f = c/λ is expressing the frequency in terms of the velocity of light  c and the wavelength λ. Lets say given not just one wavelength, but a whole list af wavelengths. The values have units attached. I wonder if there is an elegant way to have Maple calculate the all the frequencies, eventually delivering them in a new list?

I want the units of the output reduced to SI-units,...

Dear Maple users

My question is pretty basic: How do I put a "hat" on top of a variable, for example putting ^ on top of say x? It is useful for me even though the solution might not have any computational meaning, since I only need to write it as "written math" in 2D-notation. The Accents palette does have several symbols, but not the one I am looking for. In certain areas of mathematics A hat or the like does have a...

Dear Maple Users

I have encountered some strange behavior when trying to copy a vector:

In the first section I define a vector a and try to copy that vector and assign it to an variable b. Then changing the first coordinate in the copied vector b actually change the original vector as...

Dear Maple users

I have been looking for the list of fonts used by Maple, but couldn't find it. Can someone refer me to it? I am installing lots of programs on a new computer, and since some of them are graphics programs, I get a load of fonts thrown in my Windows Font folder. Therefore it is my intention to remove a lot of the unnecessary fonts. But I don't want to remove the ones used my Maple, so I will...

Dear Maple users

Many problems in mathematicis can be traced back to solving equations. It is at the heart of a program like Maple. I know solving equations in general can be immensely difficult. As an example The Riemann hypothesis has to do with the solution of a specific equation, the Riemann zeta function, and is probably the most famous unsolved problem today. I just mention this one to emphasize how hard it can be to solve an equation. Therefore I know...

Dear Maple users

I have encountered a strange problem when trying to make inline evaluations in Document Mode. The shortcut Ctrl+= does work on my stationary Windows XP machine, but does not work on my notebook running Windows 7 (64 bit).

To make it clear: I change to Math Mode using the F5 key, type the expression and hold Ctrl and Shift key down and press the key with the = sign. And Yes, I am using Document Mode!

When I rightclick in order to use...

Dear Maple Users

I was looking forward to having the Units package improved in Maple 15. Units are indeed converted to SI Units when direct calculations are made. It is a disappointment though that this conversion doesn't occur when solving equations as the example below show:

Unfortunately Maplesoft mix up their announcements for news in version 15 of Maple with...

Dear Maple users

I know how to create an animation of a sine curve moving over time (t) on an x-axis to simulate a moving wave. In the help menu under the topic plots,animation it is explained how to animate a ball moving along some curve. How do I combine those two animations into one? The ball is moving along a curve completely different from the sine curve!

Regards, Erik

Dear Maple users

Often I use Maple for solving problems in Physics. Maple does indeed a nice job when calculating expressions containing units. However when I want to plot functions containing units it sometimes work and sometimes not. Look at the following example: 

I use Maple in high school. My students deliver their homework created in Maple. Often this involves solving a number of exercises, say 7. Not all students are completely aware of how the Maple Engine works, so I tell them to put in restarts from time to time, at least when a new exercise begins. This prevents misunderstandings and loss of time which might else happen when calculations in one exercise interferes with calculations in the next exercise. One simple example...

Dear Maple Users

I know how to create 3D plots of geometrically defined objects in Maple. One can rotate the plot by plain dragging. What I would like, however, is to make the same thing happen on my website. Is it possible to export the 3D plot into some file format and embed this object on a website? They have done it on this page:

http://mathworld.wolfram.com/Catenoid.html

I will be...

Dear Maple users

This may be a very simple question: How do I operate on the coordinates of a vector in the most streamlined way?

Lets say I have a vector <2,4,5,8,9> containing the diameters of five different circles. I want a vector V in which the coordinates are the corresponding circle areas. So the first coordinate of V should be 1/4*Pi*2^2, the next coordinate 1/4*Pi*4^2 , etc...  How is this done in the most simple way i Maple? In principle I want a method, which will work for any function ...

Regards, Erik V. 

Dear Maple users

I read somewhere that plots with units is new in Maple 13. There is however something which is not working well:

> restart:
> T:=30 [[year]]:
> A0:=370000[[Bq]]:
> A(t):=A0*(1/2)^(t/T):
> plot(A(t), t=0..100[[year]])

I expected to see a plot of an exponential with units. A coordinate system was displayed but no function plot!! Can someone explain why? If I remove the units, the exponential appears!

Regards, Erik V.