Matrix of variables

[Atefe Naderi]

Hello everyone, 
I have 4 variables like this:

var p0;
var b;
var x;
var y;

And I want to create a matrix of these variables with dimensions (4*1) like so:

var X = [p0, b, x, y]
Could anyone please provide me with the syntax for this matrix? Furthermore, I would like to express the following constraint:

A * X < B .
Where A and B are matrixes of values that I have defined previously. Thank you.

Atena.

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