what's the program mistake?

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MA
MA 2014-6-3
评论： MA 2014-6-3
clear all
clc;
syms a b c
w=zeros(3,1);
w(1,1)=3*a+b;
w(2,1)=b+2;
w(3,1)=c-a;
disp(w)
b=3;
disp(w)

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Sean de Wolski
Sean de Wolski 2014-6-3
w = sym(zeros(3,1))
You preallocated w as a numeric type and then tried to stuff a sym into it. If you preallocate w as a symbolic, it works as expected.
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Sean de Wolski
Sean de Wolski 2014-6-3
You would need to subs-stitude it in
subs(w,b,3)
MA
MA 2014-6-3
subs(w,[a b c],[a 3 c]) now works,thank you so much

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