[MATLAB数学相关] 急求：subs 命令的应用 - MATLAB爱好者论坛-LabFans.com

xiaoyezi868 · 2011-01-15, 16:47

HELP 中有介绍：“subs(S,old,new)，If old and new are cell arrays of the same size, each element of old is replaced by the corresponding element of new.”但是当old 和new 中有向量时总是出现错误，求求那位智者能给予解答！！！

syms t
t0=1/3*pi;
y=[2;2;2];
y0=[1;0;0];
S=sin(t)*y;
subs(S,{t,y},{t0,y0})

ans =

3^(1/2)
3^(1/2)
3^(1/2)

答案应该是
3^(1/2)/2
0
0

2011-01-15, 16:47	#1
xiaoyezi868 初级会员注册日期: 2010-11-16 帖子: 8 声望力: 0	求助：subs 命令的应用 HELP 中有介绍：“subs(S,old,new)，If old and new are cell arrays of the same size, each element of old is replaced by the corresponding element of new.”但是当old 和new 中有向量时总是出现错误，求求那位智者能给予解答！！！ syms t t0=1/3pi; y=[2;2;2]; y0=[1;0;0]; S=sin(t)y; subs(S,{t,y},{t0,y0}) ans = 3^(1/2) 3^(1/2) 3^(1/2) 答案应该是 3^(1/2)/2 0 0 此帖于 2011-01-15 19:56 被 xiaoyezi868 编辑。