Question

MATLAB画图时出现的问题，请高手帮忙！

想要画出一个带有绝对值符号的函数：
syms z ;
k = 1.381e-23;
NA = 6.022e23;
z = -0.01:0.001:0.01;
T = 300;
Mmol = 30;
m = (Mmol*10^(-3))/NA;
c1 = m/(2*k*T);
boln = 5.8*10^(-5)*1.6*10^(-19);
delB = 400;
d = 0.07;
D = 0.42;
c2 = boln*delB*d*D/m;
f=(c1*c2).^2*exp(('±'c1*c2)./z).*((abs(z)).^(-3))
plot(z,f,'b:*')

昨天有朋友帮我修改了一下程序
f(1,:) = (c1*c2).^2*exp((c1*c2)./(z+eps)).*(abs(z)).^(-3);
f(2,:) = (c1*c2).^2*exp((-c1*c2)./(z+eps)).*(abs(z)).^(-3);
plot(z,f,'b:*');
但是运行时出现错误了----??? Subscripted assignment dimension mismatch.
求解？？？
syms z ;
k = 1.381e-23;
NA = 6.022e23;
z =-10:0.01:10;
T = 300;
Mmol = 30;
m = (Mmol*10^(-3))/NA;
c1 = m/(2*k*T);
boln = 5.8*10^(-5)*1.6*10^(-19);
delB = 400;
d = 0.07;
D = 0.42;
c2 = boln*delB*d*D/m;
f(1,:) = (c1*c2).^2*exp((c1*c2)./(z+eps)).*(abs(z)).^(-3);
f(2,:) = (c1*c2).^2*exp((-c1*c2)./(z+eps)).*(abs(z)).^(-3);
plot(z,f(1,:),'b:*');
hold on
plot(z,f(2,:),'b:*')
自变量区间我写错了，应该是这样子，运行了又出现??? Subscripted assignment dimension mismatch.？？？

Answer 1

你哟的是这样的图吗？

只需要修改plot即可：

 plot(z,f(1,:),'b:*');

 hold on

plot(z,f(2,:),'b:*');

追问

z =-10:0.01:10;
plot(z,f(1,:),'b:*');
hold on
plot(z,f(2,:),'b:*')
自变量区间我写错了，应该是这样子，运行了又出现??? Subscripted assignment dimension mismatch.？？？