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							20 lines
						
					
					
						
							371 B
						
					
					
				
			
		
		
		
			
			
			
				
					
				
				
					
				
			
		
		
	
	
							20 lines
						
					
					
						
							371 B
						
					
					
				
								#include <Eigen/Core>
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								#include <iostream>
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								using namespace Eigen;
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								using namespace std;
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								// define function to be applied coefficient-wise
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								double ramp(double x)
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								{
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								  if (x > 0)
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								    return x;
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								  else 
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								    return 0;
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								}
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								int main(int, char**)
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								{
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								  Matrix4d m1 = Matrix4d::Random();
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								  cout << m1 << endl << "becomes: " << endl << m1.unaryExpr(ptr_fun(ramp)) << endl;
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								  return 0;
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								}
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