Creating a matrix with specific sequence

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I was given this as a homework assignment but I am not really sure where to even start. Would this be a loop creation? Nested loop?

The script should assume values are specified on a command line before being run. The script should be able to take values of a, b, c, and n, and output a 3-x-n matrix B such that
B = [a a^2 ... a^n; b 2b ... nb; nc (n-1)c ... c]
Proper execution of the script would appear as follows:
>> a = 2; b = 3; c = 4; n = 3;
>> script18
B =
  2    4    8
  3    6    9
  12   8    4
Note that this script should function for any integer values of a, b, c and n.

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Stephen23 2015-5-25

编辑：Stephen23 2015-5-25

There is no need to use loops to solve everything in MATLAB. In fact there are much neater and faster ways of using MATLAB most effectively: by writing fully vectorized code instead, as Walter Roberson has hinted to you already.