双纵坐标的绘图命令为()。
A.plotyy(x1,y1,x2,y2)
B.ploty(x1,y1,x2,y2)
C.plot(x1,y1,x2,y2)
D.plotyy(x1,y1;x2,y2)
- · 有3位网友选择 B,占比37.5%
- · 有3位网友选择 D,占比37.5%
- · 有2位网友选择 A,占比25%
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)
A、A=rand(4,4); B=rand(4,4); A+B A*B A.*B A./B A.^3
B、A=rand(4,4); B=rand(4,4); A.+B A*B A.*B A./B A^3
C、A=rand(4,4); B=rand(4,4); A+B A*B A.*B A./B A^3
D、A=rand(4,4); B=rand(4,4); A+B A*B A.*B B./ A A^3
设,欲画出定义域x =[-2,2]、y =[-2,2]内的三维曲面,则以下哪个程序正确?
A、x= -2:0.1:2; y= -2:0.1:2; X=ones(size(y))*x; Y=y*ones(size(x)); z=(X .^2) .* exp(-(X .^2 + Y .^2)); mesh(z)
B、x= -2:0.1:2; y=x'; X=ones(size(y))*x; Y=y*ones(size(x)); z=(X .^2) .* exp(-(X .^2 + Y .^2)); mesh(z)
C、x= -2:0.1:2; y=x'; z=(x .^2) .* exp(-(x .^2 + y .^2)); surf(z)
D、x= -2:0.1:2; y= -2:0.1:2; z=(x .^2) .* exp(-(x .^2 + y .^2)); surf(z)
设,欲求y的一阶导数和y = 0的所有根,并求x =[-4,4]区间y的函数值,且间隔0.5计算一个值,则以下哪个程序正确?
A、a=[3,0,7,2,9,12] y1=polyder(a) r=roots(a) x= -4:0.5:4 y=polyval(a,x)
B、a=[3,7,2,9,12] y1=polyder(a) r=roots(a) x= -4:0.5:4 y=polyval(a,x)
C、a=[3,7,2,9,12] y1=polyder(a) r=roots(a) x= -4:0.5:4 y=3* x.^5+7* x.^3+2* x.^2+9* x+2 plot(x,y)
D、a=[3,0,7,2,9,12] y1=polyder(a) r=roots(a) y=3* x^5+7* x^3+2* x^2+9* x+2 plot(x,y)
已知多项式,,欲完成两个多项式相加、相乘和相除的运算,则以下哪个程序正确?
A、a= [1 0 6 2]; b= [2 6 8]; C=a+b D=conv(a,b) [q,r]=deconv(a,b)
B、a= [1 0 6 2]; b= [2 6 8]; C=a+(0,b) D=conv(a,b) [q,r]=deconv(a,b)
C、a= [1 6 2]; b= [2 6 8]; C=a+b D=conv(a,b) [q,r]=deconv(a,b)
D、a= [1 0 6 2]; b= [2 6 8]; C=a+b D=conv(a,b) E=deconv(a,b)
A、A
B、B
C、C
D、D
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