I wrote the code below in Ipython notebook to generate a sigmoid function controlled by parameters a which defines the position of the sigmoid center, and b which defines its width:
%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
def sigmoid(x,a,b):
#sigmoid function with parameters a = center; b = width
s= 1/(1+np.exp(-(x-a)/b))
return 100.0*(s-min(s))/(max(s)-min(s)) # normalize sigmoid to 0-100
x = np.linspace(0,10,256)
sigm = sigmoid(x, a=5, b=1)
fig = plt.figure(figsize=(24,6))
ax1 = fig.add_subplot(2, 1, 1)
ax1.set_xticks([])
ax1.set_xticks([])
plt.plot(x,sigm,lw=2,color='black')
plt.xlim(x.min(), x.max())
I wanted to add interactivity for parameters a and b so I re-wrote the function as below:
%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
from IPython.html.widgets import interactive
from IPython.display import display
def sigmoid_demo(a=5,b=1):
x = np.linspace(0,10,256)
s = 1/(1+np.exp(-(x-a)/(b+0.1))) # +0.1 to avoid dividing by 0
sn = 100.0*(s-min(s))/(max(s)-min(s)) # normalize sigmoid to 0-100
fig = plt.figure(figsize=(24,6))
ax1 = fig.add_subplot(2, 1, 1)
ax1.set_xticks([])
ax1.set_yticks([])
plt.plot(x,sn,lw=2,color='black')
plt.xlim(x.min(), x.max())
w=widgets.interactive(sigmoid_demo,a=5,b=1)
display(w)
Is there any way to se the range of the sliders to be symmetrical (for example around zero)? It does not seem to me to be possible by just setting the starting value for the parameters.
You can create widgets manually and bind them to variables in the interactive
function. This way you are much more flexible and can tailor those widgets to your needs.
This example creates two different sliders and sets their max, min, stepsize and initial value and uses them in the interactive
function.
a_slider = widgets.IntSliderWidget(min=-5, max=5, step=1, value=0)
b_slider = widgets.FloatSliderWidget(min=-5, max=5, step=0.3, value=0)
w=widgets.interactive(sigmoid_demo,a=a_slider,b=b_slider)
display(w)
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