How to change the name of the display variable based on input?

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I am writing a simple matlab code on multilying matrices, one of the matrices in it has elements which are a function of a parameter "theta". I want the name of the matrix (or the variable) to include that value of theta which is used to calculate those elements.
For example, in the display, i want it to show me Q_45 without me having to go and change the name manually. It should recognise that theta is 45 and hence the variable name changes to Q_45.
Please help me with this simple problem.
theta = 45;
Q_theta = [sind(theta) cosd(theta); cosd(theta) sind(theta)]
Q_theta = 2×2
0.7071 0.7071 0.7071 0.7071
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