I am using Scipy to fit my data to a function. The function give me values for 2 parameters, in this case a and b. I want to use the bound argument to limit the values these parameters can take, each have their own range of acceptable values.
Acceptable values: 15< a <50 and 0.05< b <0.2
I want to know how to implement them. The official documentation only shows how to do them for 1 parameter. This question is similiar to: Python curve fit library that allows me to assign bounds to parameters. Which also only tackles boundaries for 1 parameter.
Here is what i tried:
Eb_mean = a*(0.0256/kt) # Eb at bake temperature
Eb_sigma = b*Eb_mean
Foursigma = 4*Eb_sigma
Eb_a = np.linspace(Eb_mean-Foursigma,Eb_mean+Foursigma,N_Device)
dEb = Eb_a - Eb_a
pdfEb_a = spys.norm.pdf(Eb_a,Eb_mean,Eb_sigma)
## Retention Time
DMom = np.zeros(len(x),float)
tau = (1/f0)*np.exp(Eb_a)
for bb in range(len(x)):
DMom[bb]= (1 - 2*(sum(pdfEb_a*(1 - np.exp(np.divide(-x[bb],tau))))*dEb))
time = datafile['time'][0:501]
Moment = datafile['25Oe'][0:501]
params,extras = curve_fit(Ebfit,time,Moment, p0=[20,0.1], bounds=[(15,50),(0.05,0.2)])
params,extras = curve_fit(Ebfit,time,Moment, p0=[20,0.1], bounds=[[15,50],[0.02,0.2]])
params,extras = curve_fit(Ebfit,time,Moment, p0=[20,0.1], bounds=((15,50),(0.02,0.2)))
ValueError: Each lower bound mush be strictly less than each upper
params,extras = curve_fit(Ebfit,time,Moment, p0=[20,0.1], bounds=[0,50])
bounds=[[0,50],[0,0.3]]) means the second parameter is greater than 50 but smaller then 0.3. Also the first parameter is fixed at zero.
The format is bounds=(lower, upper).