How to create a Symbolic vector

Hi, I want to define n symbolic variables How to define: Syms x1 x2 ... xn ?! n is input function.

Answer 1

[Star Strider]

Try this::

n = inputdlg('Enter the length of the vector (integer): ');
n = str2double(n);

syms x 
x = sym('x',[1 n])

producing (for n = 5):

x =
[x1, x2, x3, x4, x5]

Reference as you would any other vector:

v3 = x(3) 

producing:

v3 =
x3

.

[Amin Mohammadi]

Thanks. But I want to define variables x1 to xn as sym. Actually elements of the vector are symbolic! Syms x1 x2...xn

[Star Strider]

My pleasure!

That is exactly what my code example does. The elements of the ‘x’ vector here are symbolic. See the documentation on the sym function for details.

Running:

whos x 

after running my code reveals:

  Name      Size            Bytes  Class    Attributes

  x         1x5                 8  sym     

So it creates a symbolic vector for ‘x’.

.