matlab中定义有含未知数的矩阵的问题
我要定义一个含有未知数的矩阵，代码如下：syms x1 x2 x3 x4 x5 x6
coefs (:, :, 1) = ;
coefs (:, :, 2) = ;
coefs (:, :, 2) = ;
为什么会出现下面的错误啊？
The following error occurred converting from sym to double:
Error using mupadmex
Error in MuPAD command: DOUBLE cannot convert the input expression into a double array.
If the input expression contains a symbolic variable, use the VPA function instead.
求高人指点，不胜感激！！！
syms x1 x2 x3 x4 x5 x6
a = ;
b = ;
c = ;
coefs (:, :, 2) = b
coefs (:, :, 1) = a
coefs (:, :, 3) = c>> coefs
coefs(:,:,1) =
[ 0, 0, 0, 1]
[ 1, 0, 0, 1]
[ 2, 0, 0, 1]
[ 3, 0, 0, 1]
[ 4, 0, 0, 1]
[ 5, 0, 0, 1]
coefs(:,:,2) =
[ 0, x1/2, 0, 1]
[ 1, x2/2, 0, 1]
[ 2, x3/2, 0, 1]
[ 3, x4/2, 0, 1]
[ 4, x5/2, 0, 1]
[ 5, x6/2, 0, 1]
coefs(:,:,3) =
[ 0, x1, 0, 1]
[ 1, x2, 0, 1]
[ 2, x3, 0, 1]
[ 3, x4, 0, 1]
[ 4, x5, 0, 1]
[ 5, x6, 0, 1] 本帖最后由 zhenyupan 于 2012-3-21 18:03 编辑
谢谢“liuyalong008 ”了，非常感谢 liuyalong008 发表于 2012-3-21 16:15 static/image/common/back.gif
非常感谢你，为什么要这样用才可以啊？
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