Frustratingly, creation of an empty array of a given size is not functionality that is natively available in polyscope. Fortunately, there has been a workaround posted as part of this thread. It requires a setting up an XML-RPC call that returns an array of the required size. I put together a feature requrest about gett better array functionality natively in polyscope a while ago, if you could drop a like there to get it more attention it would be appreaciated.
Hope this helps.
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