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PARAMETER EXPANSION (SET)Name:
The "^" can also be used to define a constant in a fit. In this case, more precision may be necessary. Setting PARAMETER EXPANSION to EXPONENTIAL will substitute the number as
In brief, setting this parameter to EXPONENTIAL is sometimes needed for fits. For all other purposes, you typically want this parameter set to NUMERIC.
where <value> is NUMERIC or EXPONENTIAL.
SET PARAMETER EXPANSION NUMERIC
. set parameter expansion exponential let pii = 3.141592654 let ee = 1.602177*(10**(-19)) let h = 6.6260755*(10**(-34)) let hb = h/(2*pii) let sn = (ee*ee)/(pii*h) . . let me = 9.10939*(10**(-31)) let mstar = 0.067*me . . let minsig = 0.0028308966 let ns = 3.342*(10**(15)) let mobility = minsig/(ee*ns) let taue = mstar*mobility/ee let kfermi = sqrt(2*pii*ns) let vfermi = kfermi*(hb/mstar) let d = (vfermi*vfermi*taue)/2.0 . . let taup = 5 let x0 = 9.36*(10**(-6)) . let function arg1 = (^hb)/(4*(^d)*(^ee)*(taup*(10**(-11)))*abs(x-x0)) let function arg2 = (^hb)/(4*(^d)*(^ee)*(^taue)*abs(x-x0)) let function arg3 = (taup*(10**(-11)))/(^taue) . let function f0 = (digamma(0.5+arg1)-digamma(0.5+arg2)+log(arg3)) let function f = (^sn)*(f0)+(^minsig) . fit y=f
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Date created: 06/05/2001 |