Error Using Abs matlab function: check for incorrect argument data type or missing argument in call to function 'abs'

I'm using matlab optimizer to solve an optimization problem (with this objective function via genetic algorithm):

camxy = @(R,Dz)norm( abs( 2*R * [cos(Dz.'*k*sin(pi/180*Theta'))])'- g);

where g is a given function and k,pi are known constants where Theta is a column vector.

After creation optimization variables using "optimvar":

R = optimvar("R",1,30,"LowerBound",0,"UpperBound",1);
Dz = optimvar("Dz",1,30,"LowerBound",0,"UpperBound",20);

It faces the error below and the object function of optimization problem can not be created:

check for incorrect argument data type or missing argument in call to function 'abs'

how can I fix it?

Answer 1

[Walter Roberson]

abs is not supported for optimization variables. However, sqrt and squaring are supported.

[hossein alizadeh]

Thanks!