read-shockley.fit

# Fityk 0.9.7

### see: https://github.com/wojdyr/fityk/wiki/ReadShockley

M=9
X[0]=0, X[1]=4.24, X[2]=6.73, X[3]=8.80, X[4]=10.39, X[5]=12.68, X[6]=14.25, X[7]=16.26, X[8]=18.93
Y[0]=0, Y[1]=1.06, Y[2]=1.39, Y[3]=1.61, Y[4]= 1.75, Y[5]= 1.94, Y[6]= 2.07, Y[7]= 2.02, Y[8]= 2.30
A = X > 0 and X < 15

# Read-Shockley equation (with degrees to radians conversion)
define ReadShockley(sigma0=1, a=1) = sigma0 * t * (a - ln(t)) where t=x*pi/180

guess ReadShockley
plot []
fit