ch4_3.java

Java环境下实现的数值分析程序

class ch4_3{
	public static void EX(double x,double x1,double x2,double x3,double x4,double x5,double y1,double y2,double y3,double y4,double y5){
		double array[][]=new double[5][6];
		for(int m=0;m<5;m++){
			for(int n=0;n<6;n++){
				array[m][n]=0.0;				
			}
		}
		array[0][0]=x1; array[0][1]=y1;
		array[1][0]=x2; array[1][1]=y2;
		array[2][0]=x3; array[2][1]=y3;
		array[3][0]=x4; array[3][1]=y4;
		array[4][0]=x5; array[4][1]=y5;
		for(int n=2;n<6;n++){
			for(int m=0;m<4;m++){
				array[m][n]=array[m][n-1]-array[m+1][n-1];
			}
		}
	    int k=6;
	    for(int m=0;m<5;m++){
	    	for(int p=0;p<k;p++){
	    		System.out.print(array[m][p]+" ");
	        }
	        k--;
	        System.out.println();
	    }
		double N=array[0][1]+array[0][1]*(x-x1)+array[0][2]*(x-x1)*(x-x2)
		        +array[0][3]*(x-x1)*(x-x2)*(x-x3)+array[0][4]*(x-x1)*(x-x2)*(x-x3)*(x-x4);
		System.out.println("N("+x+")="+N);
	}
	
	public static void main(String[]args){
		EX(21.4,20,21,22,23,24,1.30103,1.32222,1.34242,1.36173,1.38021);
	}
}