如下A、B、C是求解方程组AX=B的命令,D是求矩阵A对应的行列式值的命令,试判断哪个不正确()。
A.X = inv(A)*B
B.X = A/B
C.X = A/B
D.A1=det(A)
- · 有6位网友选择 A,占比60%
- · 有3位网友选择 C,占比30%
- · 有1位网友选择 D,占比10%
A.X = inv(A)*B
B.X = A/B
C.X = A/B
D.A1=det(A)
已知A是矩阵,方程组Ax=0有4个自由变量,则R(A)=( ) A.5; B.4; C.3; D.2.
A、5
B、4
C、3
D、2
E、2
A、plotyy(x1,y1,x2,y2)
B、ploty(x1,y1,x2,y2)
C、plot(x1,y1,x2,y2)
D、plotyy(x1,y1;x2,y2)
A、for N=2:2:8; t=0:0.1:10; y=10*cos(N*t+pi/6); subplot(2,2,N/2) plot(t,y) end
B、for N=2:2:8; t=linspace(0,10,101); y=10*cos(N*t+pi/6); subplot(2,2,N/2) plot(t,y) end
C、for N=2:2:8; t=0:0.1:10; y=10cos(Nt+pi/6); subplot(2,2,N/2) plot(t,y) end
D、t=linspace(0,10,101); for N=2:2:8; y=10*cos(N*t+pi/6); subplot(2,2,N/2) plot(t,y) end
A、M=magic(3) T=M’ rank(M) M(4,3)=6
B、M=magic(3,3) T=M’ rank(M) M(4,3)=6
C、M=magic(3,3) T=conj(M)’ rank(M) M(4,:)=[0 0 6]
D、M=magic(3) T=M’ rank(M) M(4,:)=(0 0 6)
A、X=1:100; A= X((mod(X,3)= 0)) max(A) min(A) mean(A) sum(A) std(A)
B、X=1:100; A= X((rem(X,3)= =0)) max(A) min(A) mean(A) sum(A) std(A)
C、X=1:100; A= X((rem(X,3)= =0)) max(A) min(A) aver (A) sum(A) std(A)
D、X=1:100; A= X((mod(X,3)= =0)) max(A) min(A) aver (A) sum(A) std(A)
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