matlab 曲线求导syms x1 x2 x3 x4y1=50/2*(1-cos(2*x1));dy1=diff(y1) ; X1=0:pi/1000:pi/2;Dy1=subs(dy1,X1);y2=50;dy2=diff(y2) ; X2=pi/2:pi/1000:pi;Dy2=subs(dy2,X2);y3=50-50/2*(1-cos(2*x3));dy3=diff(y3) ; X3=pi:pi/1000:3*pi/2;Dy3=subs(dy3,X3);y4=0;dy4

matlab中怎么对f=@(x)(x*x)求导呀?不想用syms 求MATLAB高手帮忙改下程序,我的有错误啊,像画三条曲线出来的syms x1 x2 x3 t x%x1=S,x2=I,x3=R%微分表达式%x=[x1;x2;x3];function xdot=DxDt(t,x)xdot=[-0.0000003*x1.*x2-0.001*x1;0.0000003*x1.*x2-0.025*x2;0.001*x1+0.025*x2];t=[0,20 matlab 曲线求导syms x1 x2 x3 x4y1=50/2*(1-cos(2*x1));dy1=diff(y1) ; X1=0:pi/1000:pi/2;Dy1=subs(dy1,X1);y2=50;dy2=diff(y2) ; X2=pi/2:pi/1000:pi;Dy2=subs(dy2,X2);y3=50-50/2*(1-cos(2*x3));dy3=diff(y3) ; X3=pi:pi/1000:3*pi/2;Dy3=subs(dy3,X3);y4=0;dy4 matlab求导问题,下面的程序书写哪里有问题 >> syms x >> diff{Rcos(x)+sqrt[L.^2-[Rsin(x)+e].^2}R L字母常量 matlab中对y=x^2求导,并画出图像 我用syms x z=diff(y,x,1) 之后怎么画图啊?x=0:1:10 之后?matlab中对y=x^2求导,并画出图像我用syms xz=diff(y,x,1)之后怎么画图啊?x=0:1:10之后?该怎么办啊. matlab 变量x1和x(1)例如syms x1 x2 x3 realf=2*x1+3*x2+5*x3如何转换为f=2*x(1)+3*x(2)+5*x(3) matlab 中,syms x 是不是相当于x=sym('x') matlab的函数求导r=5.5syms x1 Q1Q1=57.9118.*(2.*(2*((acos((5.5-21.25.*sin(((750.*x1/180)*pi-120*n1)/2))/5.5)).*180./pi)*pi*r^(2)/360-5.5^(2).*sin(2*(acos((5.5-21.25.*sin(((750.*x1/180)*pi-120*n1)/2))/5.5)))/2))./7850;dQ1=diff(Q1)x1=0:0.01:0.04;ez MATLAB 中syms 请问一下这个matlab程序的syms哪里错了syms x; f(x)=x^3+2*x^2+10*x-20;d(x)=3*x^2+4*x+10;x2=1.5; x1=1.49;a=0.5;while x2==x1&&abs(f(x2)) 用matlab解含参数方程组syms x1 x2>> [x1,x2]=solve('s1^2=(x+r*sin(x1)*sin(x2))^2+(r*sin(x1)*cos(x2)+d/2)^2+(h-r*cos(x1))^2','s2^2=(x+r*sin(x1)*sin(x2)-l)^2+(r*sin(x1)*cos(x2)-d/2)^2+(h-r*cos(x1))^2','x1','x2')matlab一直在运行啊 算不出 matlab小白又来提问了 今天是有关于SOLVE函数的syms x1 x2 x3 x4[x1.x2.x3.x4]=solve('x1+x2+x3+x4=1','39.8667*x1+ 50.7441*x2+29.3857*x3+ 29.0516*x4=39.82','44.0964*x1+60.4699*x2+30.7047*x3+29.2015*x4=44.72','48.0599*x1+69.2528*x2+32.0626*x matlab生成x1 x2 x3i写一个matlab脚本,根据i值,循环产生符号比如i=3,则产生syms x1 x2 x3若i=4,则产生syms x1 x2 x3 x4 matlab solve的问题.syms x ysolve('3*x+6*y=7','5*x-7*y=6',x,y)这个编译没问题,但是运行的结果很怪.ans = x:[1x1 sym] y:[1x1 sym]然后我输出x1的值仍是x1,而不是具体的数字,为什么? matlab初学者想高手请教个问题哈：x03^2=(x02*sin(x2)-x04*sin(x1+x2)-x05)^2+(x02*cos(x2)-x04*cos(x1+x2))^2；sin(x1)*(sqrt(x01^2+x02^2-2*x01*x02*cos(x2)))=sin(x2)*x01 其中x1,x2是未知数,其余是已知数,我是这么考虑的syms x1 x matlab 用plot画曲线命令出错程序如下：syms x>> syms y>> y=1.2-0.8*erf(x/0.76)-0.3*erf((10-x)/0.76)y =6/5-4/5*erf(25/19*x)+3/10*erf(-250/19+25/19*x)>> x=0:0.01:10;>> plot(x,y);Error using ==> plotConversion to double from sym is not possib matlab绘制多条曲线我在前文用syms定义的参数变量,经过一系列运算求得f=1/x^2p1=1/x^3p2=1/x^4怎样将这些函数都绘制在同一图中?如果写成plot(x,f)会出错,因为我x是syms型的,请问如何解决Error using ==> matlab求梯度syms x1 x2f=x1^2+x2^2求f的梯度,结果为[2*x1 2*x2]',怎么求