d=gcd(a,b)
Inputs  
a 
An array of integers or a scalar integer. 
b 
An array of integers of the same size as a or a scalar integer. 
Outputs  
d 
An array of integers of the same size as the inputs, which each element being the greatest common divisor of the corresponding elements of a and .

>>gcd(36,54) 18 >>gcd(56,[10 20 8]) 2 4 8