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calling function from a function.cpp file

binaryamg (17)
i have a void function in a separate .cpp file called:
void calculate_vector.cpp

my function.cpp code:
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#include <vector>
#include <iostream>


using namespace std;


void calculate_vector(vector<double>&vec1,vector<double>vec2){
//some codes;;

}



my main.cpp file calls for this function calculate_vector,
my main.cpp codes:
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#include <vector>
#include <iostream>
#include <ctime>
#include <cstdlib>

using namespace std;


void calculate_vector(vector<double>&v0,vector<double>v1);



int main(){
//some codes//
....
....
....
calculate_vector(vectorA,vectorB);
}

i would not like to state the function codes inside my main.cpp.
why do this error occur I call the function in my main.cpp file instead of stating the function inside my main.cpp file.


I have already declared the function,
i keep getting this error:
"undefined reference to 'calculate_vector(std::vector<double, std::allocator<double> >&, std::vector<double, std::allocator<double> >)'
ne555 (10692)
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