matlab中P=subs(P,'t',

matlab中P=subs(P,'t', MATLAB中subs(subs())两个连起来怎么使用? Matlab中subs函数的使用syms x w b t;x=dsolve('D2x+2*b*Dx+w^2*x=0','Dx(0)=4,x(0)=0');dx=diff(x,t);w=2;b=0.1;x1=subs(x);dx1=subs(dx);t=0:0.1:100;xt=subs(x1,t);dxt=subs(dx1,t);subplot(221);plot(t,xt);subplot(222); subplot(222);plot(xt,dxt)其中四 matlab中P(:,:, matlab中p(i,: MATLAB中subs是什么syms t; f=sym('sin(t)/t'); f1=subs(f,t,t+3); f2=subs(f1,t,2*t); f3=subs(f2,t,-t); subplot(2,2,1);ezplot(f,[-8,8]);grid on; subplot(2,2,2);ezplot(f1,[-8,8]);grid on; subplot(2,2,3);ezplot(f2,[-8,8]);grid on; subplot(2,2,4);ezplot matlab神经网络工具箱中newrb(P,T,GOAL,SPEARD,MN, matlab中 p=[-1:.05 :1] 关于matlab积分的使用,syms w x m oj b r q ob o h s0 b0 t p M kf1=x*{exp(w*m*i-0.5*w^2*oj^2)-1-w*m*i};f2=b - r -q +0.5*o^2 - h*o^2 + subs(f1,'w',-i*h-i)-subs(f1,'w',-i*h);f3=x * exp( m * h + 0.5 * h^2 * oj^2) * ( exp( i* w * (m + h * oj^2 ) - 0. matlab编程画图.等了好久了!>> syms xx z k D t m q T x;p=(x.^(1-m))*k*D*(t^m)*exp(q*(1/293-1/T))./(1.78*(1-m))-(0.5*z/xx)^2;pp=subs(p,{xx,z,k,D,t,m,q,T},{.2,0.06,7,3*10^-4,0.07,0.4,6100,293});solve(pp)这是我计算程序,我想画出这样 matlab函数计算syms f o s z k D t m q T x;p=f-o-(s-o)*(1-erf(0.5*z/(k*D*(t^m)*exp(q*(1/T-1/273))*x.^(1-m)/(1.78*(1-m)))^0.5));pp=subs(p,{f,o,s,z,k,D,t,m,q,T},{0.1,0.02,0.45,25,20,143,0.0767,0.7,6100,293});solve(pp)电脑太慢了,算了好久没 matlab if abs(max(max(p(:,:,t))))>1e10 p(:,:,k)=p(:,:,k)/1000; matlab中 p(3,:)=0 Remove=find(t(4,:)>1); t(:,Remove)=[]; t(4,: matlab中 P为矩阵 P（P~=0)=1 matlab中subs函数subs(sym(f),findsym(sym(f)),a) f是一个函数, matlab编写问题我想同时在程序中进行函数求导,并且循环计算,并把数据打出.自己设计的程序如下：clear;syms t;L1=12.195;L2=45.825;L3=29;L4=34;L5=59.5725;b1=40;b2=120;b3=144;a=subs('230*2*pi*t/60'); X1=subs('-L4*sin((b3 统计学中t,p, 统计学中t,p,