Converting cell vector to symbolic vector

Hello,

I am a beginner in Matlab so I hope you can help me:

I have a vector (Class:cell) e.g. x=[x_a ; x_b ; y_a]; I need a conversion to symbolic vector, because I need a Matrix Vector operation, e.g. b=A*x

I hope there is a solution for this kind of problem.

Thank you !

Answer 1

[Kim O]

fid = fopen('x.txt');
x_str1 = textscan(fid, '%s');
fclose(fid);
x_str=x_str1{1};

diim=size(x_str,1);

for i=1:diim

    xs(i,1)= sym(x_str(i));

end

[Walter Roberson]

I think that should be sym(x_str{i}) with {} instead of ()

Answer 2

[Kim O]

it doesnt work because if my cell vector ist x_cell=[sin(t) ; t] and i convert this as shown above i get x_sym=[sin(t) ; t]

BUT: If I define t=sym('t'); and then t=pi; ==> x_sym is NOT [sin(pi) ; pi] Has anyone a SOLUTION?

[Walter Roberson]

subs(x_sym)

[Kim O]

Thats great, thank you Walter, it works!

But lets say I have a symbolic x=[U1 ; U2];

And my symbolic xs that I generate from my txt file is xs=[x(1)+2 ; x(1)+x(2)];

with subs(xs) I don't get xs=[U1+2 ; U1+U2]