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Size of outputs in OpenMDAO

Is it possible to have lists or arrays passed as outputs of components in openMDAO?

Since my problem relies on 6x6 matrices to solve an equation of motion in 6 degrees of freedom, I would like to be able to do the following:

M = np.ones([6, 6])
outputs['M'] = M

However, that results in an error:

ValueError: cannot reshape array of size 36 into shape (1,)

Is there any way to avoid passing each of 36 values seperately?

Solution

  • Yes, you can declare an output of any size or shape in your component's setup method by doing the following:

    self.add_output('M', shape=(6, 6))

    or

    self.add_output('M', val=np.ones((6, 6)))