## 192 Reputation

15 years, 195 days

## Declaring a constant as 'small'..?...

Hey folks I'm doing a series expansion in terms of a small variable called e in my case. In this equation there is also a constant, alpha, that is of the same order as e. What I would like to do is expand this and if I expand it to say, order e, I would like not only e^2 terms to be ignored, but also e*alpha and alpha^2 terms. Is there a way to do this?

## Filling an Array...

Maple 13

Hey folks I have a question regarding how to fill an Array.

Lets say I do this...

Array(1..10, [seq(i, i=0..9)]);

This produces [0 1 2 3 4 5 6 7 8 9] as output which is fine.

Now lets say I want a 2x10 array (2 rows, 10 columns), the top row being the digits 0-9 (as above) and the second row being something else (in this case it is counting the number of times each digit appears in Pi)

Maple 13

This happens every single time I try to do this and I need to resolve it once and for all.

I have a text file called be which is sitting on my desktop. It consists of two columns of data seperated by whitespace. How do I get maple to read this file? The help pages are of no use since it just tells me to do something like...

both of give the same "Error, (in readline) file or directory...

## Using isolve with conditions...

Maple 13
Hey folks I'm trying to solve equations using isolve for which I want conditions on my two variables x and y. I would like them to be both positive and x>y. The problem I'm having with isolve now is that I can't manipulate the output I get. Perhaps there is a way to do this but I can't see how yet. It would produce something like {x = 1, y = 2} for example and I can't extract the numerical values from it (at least using [] operators). I currently don't have access to maple...

## Permutation testing...

Maple 13

Hey folks and (almost) Merry Christmas!

How do I check if a number is a permutation of another number (doesn't have to be a cyclic one though)

E.g...

Let x = 123456789

How would I test to see that, for example, 847591236 is a permutation of x without generating every permutation of x?

I feel there should be an obvious command for this but I can't seem to find any...

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