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HELP WITH Integral nonlinearity (INL) and differential nonlinearity (DNL) of data converters

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Hi, I'm developing an A/D converter in the LTspice program. However, the circuit presented problems and I only have the transfer curve.
I need to do a performance tests, find the INL and DNL error, how to do it in matlab?
Does anyone know how to assemble the function below from the vectors I have for the curve?
s = inldnl(analog,digital,range,type)
s = inldnl(___,Name,Value)

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