1、cos(x)y=cos(x)y3=tan(x);subplot(2,2,3)plot(x,y3,k-tan(x)y=tan(x)y4=cot(x);subplot(2,2,4)plot(x,y4)cot(x)y=cot(x)3.解方程组:a=3 2 1;1 -1 3;2 4 -4;b=7;6;-2 ;x=ab4.请实现下图:x=linspace(0,4*pi,1000);y2=sin(2*x);-,x,y2,b*);耿蒙蒙,sin(2*x)5.请在x,y在(-2,2)内的z=xexp (-x2-y2) 绘制网格图x,y=meshgrid(-2:0.1:2);z=x.*exp (-x.2-y.2
2、);mesh(x,y,z)6.请实现peaks函数:x,y=meshgrid(-3:1/8:3);z=peaks(x,y);surf(x,y,z)shading flataxis(-3 3 -3 3 -8 8)Peaks7.请在x=0,2,y=-0.5*pi,7.5*pi,绘制光栅的振幅为0.4的三维正弦光栅。x=0:2;y=-0.5*pi:0.01*pi:7.5*pi;x,y=meshgrid(x,y)z=sin(y);axis(0 2 -0.5*pi 7.5*pi -6 6)8.请用ezplot函数绘制sin(x2),x的区间为0到8*pi。ezplot(sin(x2),0,8*pi)9.
3、样本点; x=0 0.25*pi 0.5*pi 0.75*pi pi 1.25*pi 1.5*pi 1.75*pi 2*pi;y=0 0.5*2.0.5 1 0.5*2.0.5 0 -0.5*2.0.5 -1 -0.5*2.0.5 0; 对样本点进行spline插值。并将样本点和插值后的数据进行绘图。x0=0 0.25*pi 0.5*pi 0.75*pi pi 1.25*pi 1.5*pi 1.75*pi 2*pi;y0=0 0.5*2.0.5 1 0.5*2.0.5 0 -0.5*2.0.5 -1 -0.5*2.0.5 0;plot(x0,y0,ohold onx=0:0.01:2*pi;y
4、=interp1(x0,y0,x,spline10.请实现下图:利用多项式求根方法求解x3-x2-3=0。y=1 -1 0 -3;r=roots(y)11. A = 2 i + 5 j + 7 k B = 8 i + 4j + 6 k 求C=ABA=2 5 7;B=8 4 6;C=conv(A,B)12. A = 2 i + 5 j + 7 k 求C=AB C=A*B13. 用不同标度在同一坐标内绘制曲线y1=e-0.3xcos(2x)及曲线y2=10e-1.5x。pi/180:2*pi;y1=exp(-0.3*x).*cos(2*x);y2=10*exp(-1.5*x);plotyy(x,y
5、1,x,y2)14.请实现下图:x=linspace(0,8*pi,1400);area(y,0)15. n=dblquad(exp(-(x.2)/2).*sin(x.2+y),-1,1,-2,2)16.请实现: t=0:10*pi,x=tcos(t),y=tsin(t),z=t,三维曲线。ezplot3(t.*cos(t)t.*sin(t)t,0,10*pi)17. a=1 6 11 6;r=roots(a)poly(r)18. syms x f=5*x3+6*x2+3*x+9;diff(f,x,1)19. 已知样本点x=-2.8 -1 0.2 2.1 5.2 6.8; y=3.1 4.6
6、2.3 1.2 2.3 -1.1;求其三次拟合,并绘出样本点和拟合图像。x=-2.8 -1 0.2 2.1 5.2 6.8;plot(x,y,p=polyfit(x,y,3)x0=-3:7;y0=polyval(p,x0)r-20.构建内联函数y=sin(x)exp(x2);并求出x=1 4 2 5 8的y值。y=inline(sin(x).*exp(x.2)xi= 1 4 2 5 8;yi=y(xi)21.请实现从距离地面20米高处,以水平速度5m/s跳下的实际运动轨迹。解:,得,即(0x10m)10;h=-0.2*x.2;plot(x,h,-x/mh/m22.请绘出斜抛运动的实际轨迹。 初
7、速度为10m/s,与地面的夹角为300。,得13;h=-15(-1)*x.2-3(-1/2)*x;plot(x,h)23.请求出df(x)/dx=ax3+x2-bx-csyms x a b cf=a*x3+x2-b*x-c;24. z=1./(x+1).2+(y+1).2+1)-1./(x-1).2+(y-1).2+1);25. x=-10:10subplot(1,2,1)plot(x,sin(2*x).*cos(3*x)sin(2x)cos(3x)subplot(1,2,2)plot(x,0.4*x)0.4x26. 25;y1=2.6*exp(-0.5*x).*cos(0.6*x)+0.8;
8、y2=1.6*cos(3*x)+sin(x);b-y1=2.6exp(-0.5x)cos(0.6x)+0.8y2=1.6cos(3x)+sin(x)27. y=int(sin(x)+2,x,0,pi/6)28.solve(sin(x)+tan(x)+1=029.y=dsolve(Dy=(x+y)*(x-y)30.插值法拟合法31. 请用三种方法求解sin(x)在0pi之间的积分。1:a=quad(,0,pi)2:x=linspace(0,pi,1000);a=trapz(x,y)3:y=int(sin(x),x,0,pi)32. z=x.2.*exp(-x.2-y.2);33. ,当x和y的取
9、值范围均为-2到2时,用建立子窗口的方法在同一个图形窗口中绘制出网线图、表面图和去网格效果的表面图。z=x.*exp(-x.2-y.2);subplot(1,3,1)subplot(1,3,2)subplot(1,3,3)34. 有一组测量数据满足,t的变化范围为010,用不同的线型和标记点画出a=0.1、a=0.2和a=0.5三种情况下的曲线。t=0:1:y1=exp(-0.1*t);y2=exp(-0.2*t);y3=exp(-0.5*t);plot(t,y1,b-o,t,y2,r-*,t,y3,g-35. 有一正弦衰减数据y=sin(x).*exp(-x/10),其中x=0:pi/5:4
10、*pi,用三次样条法进行插值。4*pi;y=sin(x).*exp(-x/10);xi=0:yi=interp1(x,y,xi,cubicb-,xi,yi,ro36. 求解多项式x3-7x2+2x+40的根。a=1 -7 2 40;37. 对于,如果,求解X。a=4 9 2;7 6 4;3 5 7;b=37;26;28;lay 放置 laid laidx=ab38. 请建立隐函数,y=x2exp(x),并求出x=7 8 9时的函数值。并将函数绘图x.2.*exp(x)wake 醒着 woke / waked woke / waked / woken6. 含有元音字母o / i的词,将o / i
11、变成a。如:singsang, givegave, sitsat, drinkdrankxi=7 8 9;wake 醒着 woke / waked woke / waked / wokensend 送 / 寄 sent sentbend 使弯曲 bent bentyi=y(xi)build 建造 built built39. 在-10,10,-10,10的范围内会三维图may 可以 might cut 割 cut cutx,y=meshgrid(-10:10);cost 花费 cost costrun 跑 ran runrid 免除 rid / ridded rid / riddedz=sin(x.2+y.2).(1/2)./(x.2+y.2).(1/2);stand 站立 stood stoodbuy 买 bought boughtsurf(x,y,z)show 显露 showed showed / shownshading flat40. 请绘制以20m/s速度竖直上抛运动的位移图像。draw 画,拉,拖 drew drawnblow 吹 blew blown解:h=-5*t.2+20.*t;plot(t,h)feel 触摸 felt feltfall 掉落 fell fallengrid ont/swill 将 would
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