Data type issue in freud.kspace.AnalyzeSFactor3D class

When I call the getSvsQ and getPeakList functions from the freud.kspace.AnalyzeSFactor3D class, I get errors. I think the code is expecting an integer instead of a float for the self.g variable.

For the getSvsQ function I get the following error: 'float' object cannot be interpreted as an integer

For the getPeakList function I get the following error: Cannot cast ufunc subtract output from dtype('float64') to dtype('int64') with casting rule 'same_kind'

I believe this error may come from the value of self.g, which should be an integer instead of a float. In the init function for the freud.kspace.AnalyzeSFactor3D class, self.g = self.grid/2, which makes self.g a float. However, self.g is used later as a parameter in the range function, which only takes integers as input.

I am using Freud version 0.6.2 with python 3.6.

Thank you

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