MATLAB decomposing numbers (armstrong numbers)

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SUMMARY

This discussion focuses on decomposing numbers to identify Armstrong numbers using MATLAB. The user, Peter, seeks an optimized method for this task, providing an example of the number 57483920 and its decomposition into digits. He defines an Armstrong number as one where the sum of its digits raised to the power of the number of digits equals the number itself, citing examples such as 370 and 153. Peter has created a function but is looking for enhancements to improve its efficiency.

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pslarsen
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Hello.
I want to solve the problem with armstrong numbers. Is there a smart way to decompose a number in MATLAB?

E.g. 57483920 = [5 7 4 8 3 9 2 0]

I want to find the numbers which has the following property:

Let k be the number of digits in a number, n, and d1,d2,d3,d4... be the digits of n.
Say n=370. Then k=3 and d1=3, d2=7 and d3=0.
Now 3^3+7^3+0^3=370. So 370 is an Armstrong number.
Armstrong iff n=d1^k+d2^k+d3^k+d4^k+..

Another Armstrong number is 153 because 1^3+5^3+3^3 = 153
 
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Okay, I have written my own function but it can surely be optimized. The first 20 Armstrong numbers are:

1
2
3
4
5
6
7
8
9
153
370
371
407
1634
8208
9474
54748
92727
93084
548834

Enjoy,
Peter.

PS: To run the programme place both MATLAB-files in the same directory and run faktor2.m
 

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