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How to create a Symbolic vector

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Amin Mohammadi
Amin Mohammadi on 27 Feb 2021
Commented: Star Strider on 27 Feb 2021
Hi, I want to define n symbolic variables How to define: Syms x1 x2 ... xn ?! n is input function.

Answers (1)

Star Strider
Star Strider on 27 Feb 2021
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
.
  2 Comments
Star Strider
Star Strider on 27 Feb 2021
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’.
.

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