MATLAB: How to take the product of distinct array values

array valuesgcdMATLABprime numberproduct

clc; 
clear all; 
close all;
Bx     = 720;                             
By     = 360;                              
g      = gcd(Bx,By);
f      = factor(g);
f_prod = prod(f);

In this example f = [ 2 2 2 3 3 5 ], and prod(f) = 360, but I just want to receive the product of distinct primes (i.e. 2*3*5). Is there a way to do this?

Best Answer

prod(unique(f))

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MATLAB: Help me avoid this error: Empty matrix: 0-by-1

Change : d(i) = prod(f); to

 if isempty(f)
  d(i) = NaN;
 else
  d(i) = prod(f);
 end

and e = sum(d) to:

 e = nansum(d);

If NaN isn't convenient, change it for something that is.

MATLAB: How to duplicate each cell in an array

Something like this maybe,

n = 3;
array1 = [1,2,5];
array2 = reshape(array1.*ones(n),1,[])
     1     1     1     2     2     2     5     5     5

array2 = ones(n).*array1
array2 = array2(:).'

 array2 = reshape(repmat(array1,n,1),1,[])

Best Answer

Related Solutions

MATLAB: Help me avoid this error: Empty matrix: 0-by-1

MATLAB: How to duplicate each cell in an array

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