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% Access a property named 'factor' in an OpenSim::Object 
% it is equivalent to having the XML tag name <factor> in an .osim file
factorProp  = objectWithFactor.getPropertyByName('factor');
% get its value
factor = PropertyHelper.getValueDouble(factorProp);
% double the factor and set it on the property
PropertyHelper.setValueDouble(2*factor, factorProp);

% Access a property named point, which is of type SimTK::Vec3
pointVec3Prop = objectWithPoint.getPropertyByName('point');
point(1) = PropertyHelper.getValueVec3(pointVec3Prop , 0); % x component
point(2) = PropertyHelper.getValueVec3(pointVec3Prop , 1); % y component 
point(3) = PropertyHelper.getValueVec3(pointVec3Prop , 2); % z component

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## this is written in python. Just get rid of the 'osm.' parts and it should work in ## matlab

import opensim as osm 

# load a model
model = osm.Model('/home/support/Arnoldetal2010_2Legs_50pct_v2.1.osim')

# get a handle to a wrap object
wrap = model.getBodySet().get('pelvis').getWrapObjectSet().get(1)

# get handle to the property
prop = wrap.getPropertyByName('translation')

# get the x translation value
x_translation = osm.PropertyHelper.getValueDouble(prop , 0)

# set a new x tranlsation value
osm.PropertyHelper.setValueDouble(x_translation + 1 ,prop, 0)

# re-initialize the system to validate the 'new' model.
model.initSystem()