def envelope(self, instrument):
        """
        Computes isotopic envelope for a given instrument model

        :param instrument: instrument model to use
        :returns: isotopic envelope as a function of mass
        :rtype: function float(mz: float)

        """
        def envelopeFunc(mz):
            if isinstance(mz, numbers.Number):
                return ims.spectrum_envelope(self.ptr, instrument.ptr, mz)
            mzs = _cffi_buffer(mz, 'd')
            n = len(mz)
            buf = _cffi_buffer(n, 'f')
            ret = ims.spectrum_envelope_plot(self.ptr, instrument.ptr, mzs.ptr, n, buf.ptr)
            if ret < 0:
                _raise_ims_exception()
            return buf.python_data()

        return envelopeFunc
def envelope ( self , instrument ) : def envelopeFunc ( mz ) : if isinstance ( mz , numbers . Number ) : return ims . spectrum_envelope ( self . ptr , instrument . ptr , mz ) mzs = _cffi_buffer ( mz , 'd' ) n = len ( mz ) buf = _cffi_buffer ( n , 'f' ) ret = ims . spectrum_envelope_plot ( self . ptr , instrument . ptr , mzs . ptr , n , buf . ptr ) if ret < 0 : _raise_ims_exception ( ) return buf . python_data ( ) return envelopeFunc
Computes isotopic envelope for a given instrument model

        :param instrument: instrument model to use
        :returns: isotopic envelope as a function of mass
        :rtype: function float(mz: float)