已知有限长序列x[k]={1,2,3;k=0,1,2}和h[k]={5,-2,4;k=0,1,2},则x[k]和h[k]的4点循环卷积为（ ）。
A: {2,15,8,17; k=0,1,2,3}
B: {5,8,15,2,12; k=0,1,2,3,4,5}
C: {12,2,15,8,5; k=0,1,2,3,4,5}
D: {17,8,15,2; k=0,1,2,3}
A: {2,15,8,17; k=0,1,2,3}
B: {5,8,15,2,12; k=0,1,2,3,4,5}
C: {12,2,15,8,5; k=0,1,2,3,4,5}
D: {17,8,15,2; k=0,1,2,3}
举一反三
- 执行下列代码段后，s的值为________。 int a[] = {5, 3, 7, 2, 1, 5, 3, 10}; int k, s = 0; for(k = 0; k < 8; k += 2) s += a[k];
- 已知x[k]={1 1;k=0,1},h[k]={2 1;k=0,1},求y[k]=x[k]*h[k] A: {2,3,1;k=0,1,2} B: {2,2,1;k=0,1,2} C: {2,0,1;k=0,1,2} D: {1,3,1;k=0,1,2}
- 阅读以下代码，x=[0 1 0 2 0 3 0 4];for k=1:8if x(k)==0 x(k)=k;elsex(k)=2*k+1;endend回答：x(2)=______ ，x(5)=______
- 已知序列x[k]={4,3,2,1,-2; k=0,1,2,3,4},试求有限长序列x[(k-2)5]（ ）。 A: {4,-2,1,2,3; k=-4,-3,-2,-1,0} B: {1,-2,4,3,2; k=-4,-3,-2,-1,0} C: {4,-2,1,2,3; k=0,1,2,3,4} D: {1,-2,4,3,2; k=0,1,2,3,4}
- 已知序列x[k]={4,3,2,1,-2; k=0,1,2,3,4},则有限长序列x[(5-k)5]为（ ）。 A: {1,2,3,4,-2; k=0,1,2,3,4} B: {1,-2,4,3,2; k=0,1,2,3,4} C: {4,-2,1,2,3; k=0,1,2,3,4} D: {4,-2,1,2,3; k=-4,-3,-2,-1,0}