## 4413 Reputation

8 years, 255 days

## Star database procedure query of Simbad...

Maple

Here's a little procedure to fish out data from the Simbad database.  Some star names may not work if the page Simbad brings up is not completely filled, but it should work for most queries.

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## Main Stars within 50 ly...

Maple

I found this http://www.atlasoftheuniverse.com/50lys.html and wondered how to do it in Maple. With a bit of data file editing I came up with this.  All stars within 50 light years that are visible to the naked eye.

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The modified data file and the maple worksheet below

stars3.txt

## Realizing measurements from a sheet of p...

Ever needed to measure something and all you had was a piece of paper?  This leads us to how we can use maple to figure out what we can measure using a sheet of standard 8-1/2" x 11" paper.

Can we measure 6" with a sheet of paper?

> eq := (17/2)*x+11*y = 6;
17
eq := -- x + 11 y = 6
2
> eq2 := isolve(eq, a);
eq2 := {x = -20 - 22 a, y = 16 + 17 a}
> subs(a = 0, b = 0, eq2);
{x = -20, y = 16}

So that is the simplest case, stacking up 16 pieces on the long side and subtracting 20 on the short side.  A total of toppling the piece of paper over 36 times.  That's a high percentage of of error.

But wait!  haha.   Wouldn't a fold make it simpler?  Sure!  Fold the 8.5" across and we now have 2.5" to work with.

> eq := (17/2)*x+11*y+(5/2)*z = 6;
17            5
eq := -- x + 11 y + - z = 6
2             2
> eq2 := isolve(eq, {a, b});
eq2 := {x = a, y = 1 + 4 a + 5 b, z = -2 - 21 a - 22 b}
> subs(a = 0, b = 0, eq2);
{x = 0, y = 1, z = -2}

Less toppling of pieces of paper and much less error.

## Can not copy paste in mapleprimes ...

MaplePrimes

The copy paste and snip tool used to work.  I can no longer use either to paste in mapleprimes.

## Applications Maplesoft search not bringi...

I find it hard to believe when I enter the search term Maple 6 Maple 7 maple 8 etc.. old versions search prior to Maple 10 it only brings up a maximum of 4 pages.  I know there are more applications of old.

Are all applications still there and the search just not bringing them up?

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