x_opr=[1 2 3 4 5 6 7 8 9];
Output of this command is:
[ x1, x2, x3, x4, x5, x6, x7, x8, x9]
x1 to x9 will be used in some calculations, but i have an error message: Undefined function or variable 'x2'.
It seems that i have to define x1 to x9 as symbolic again, but i have already wrote them as a vector. Where is my wrong?