Your code is working correctly. The reason why the set method appears like not working is because the get method is dependent on L and nz. Since the values of L and nz are unchanged, the get method always calculates the value of dz and it remains at 0.005, although the set method is used with different values. Consider modifying your code.
Initialize dz when you create the object and always get the current value of dz for display (no calculations).
classdef Material
properties
L
nz
dz
end
methods
function newMat = Material(L, nz)
if nargin == 2
newMat.L = L;
newMat.nz = nz;
newMat.dz = L/(nz-1);
end
end
function dz = get.dz(newMat)
dz = newMat.dz;
end
function newMat = set.dz(newMat,value)
newMat.dz = value;
end
end
end
