546 Reputation

11 years, 68 days

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.

How to operate on coordinates in a vecto...

Maple

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.

Plots with units...

Maple

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.

Automatic table creation with contents...

Maple

I have been looking in Maple User Manual on how to create tables. It does describe how to do it manually going from cell to cell. What I am looking for is however a way to do it more automatically, like for example in Microsoft Excel, where you only need to write the formula in one cell and then copy down the formula to the rest of the cells in the actual column by dragging. I know Maple doesn't work the same way, I just want the proces automated ...

How do I display isotopes in 2D notation...

Maple

I have now used quite some time trying to find out how to display an isotope in Maple in 2D-math notation. In He-4-2 I want the nucleon (or mass) number 4 to stay as a superscript, but to the left of He, and the proton number 2 as a subscript also to the left of He. How can this be done in Maple in 2D-math notation? I hope someone can help.

Erik V.

How to plot from external data...

Maple

Dear Maple Users

I am still pretty new to Maple. I know it is possible to plot a set of x-values against a corresponding set of y-values, like:

> plot([[0,3], [1,7], [5,14], [6,17]])

but how is it done more conveniently? I mean, if I want to import data from another program and I have copied the data from two columns to the clipboard, how do I plot the first column against the second?

Regards, Erik V.

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