Create a matrix with letters

I would like to know how to create the following matrix:

When there is a list of points with weights (xi, yi, zi are coordinates and mi are weights) I just don't know how to create it with those letters.

[James Tursa]

Do you currently have variables with the m, x, y, z data in them?

[Lee Cohen]

No, I don't have data in them.

[James Tursa]

Are you trying to form a symbolic matrix? How is this going to be used downstream in your code?

[Lee Cohen]

Yeah, I tried to write this code:

n = input('enter n\n');
syms m x y z
 m x y z=ym('m x y z', [n 1]

I am trying to create this matrix using the information from

https://www.mathworks.com/help/symbolic/create-symbolic-matrices.html

but I get error.

Answer 1

[James Tursa]

Is this what you want:

A = [sym('m%d',[n 1]) sym('x%d',[n 1]) sym('y%d',[n 1]) sym('z%d',[n 1])]

[Lee Cohen]

yes, thank you so much!