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My PhD thesis - Condensed Matter Theory - Imperial College London

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APPENDIX D. RECONSTRUCTING A PROBABILITY DENSITY FUNCTION<br />

which is infinite.<br />

In general, there is an optimum number of functions to use; when more points<br />

have been sampled, more functions should be used. Ideally the coefficients for the<br />

neglected functions (c i , where i = N χ + 1, . . . , ∞) should be very small; for this<br />

reason, it is important to choose a sensible basis. The best basis is one in which all<br />

the coefficients are zero above some cut-off.<br />

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