There is no ‘z_state()’ fish intrinsic function, you either use state(i,j) or z_prop(i,j,‘state) for CPP constitutive models to access the ‘state’ value. And use z_prop(i,j, ‘cohesion’) and z_prop(i,j,’ tension’) to assign new values.
Check this topic: Use z_model(),z_prop() and z_group(). to access model and properties
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