def score(x):
R1, R2, C = x
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - HIGH_TARGET)
low_d = abs(low - LOW_TARGET)
# Tweak error function to best fit requirements
return high_d + low_d
def score(x):
R1,R2,C = x
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - HIGH_TARGET)
low_d = abs(low - LOW_TARGET)
# Tweak error function to best fit requirements
return high_d + low_d
def score_free(x, target_high, target_low):
"""scoring function for finding optimal
component values within a defined range"""
R1, R2, C = x
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - target_high)
low_d = abs(low - target_low)
# Tweak error function to best fit requirements
return high_d + low_d
def score_free(x, target_high, target_low):
"""scoring function for finding optimal
component values within a defined range"""
R1, R2, C = x
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - target_high)
low_d = abs(low - target_low)
# Tweak error function to best fit requirements
return high_d + low_d
def score(x, target_high, target_low, R_set, C_set):
"""scoring function for selecting from a set list
of components"""
R1_ix, R2_ix, C_ix = [int(round(xi)) for xi in x]
R1 = R_set[R1_ix]
R2 = R_set[R2_ix]
C = C_set[C_ix]
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - target_high)
low_d = abs(low - target_low)
# Tweak error function for desired optimization
return high_d + low_d
def score(x, target_high, target_low, R_set, C_set):
"""scoring function for selecting from a set list
of components"""
R1_ix, R2_ix, C_ix = [int(round(xi)) for xi in x]
R1 = R_set[R1_ix]
R2 = R_set[R2_ix]
C = C_set[C_ix]
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - target_high)
low_d = abs(low - target_low)
# Tweak error function for desired optimization
return high_d + low_d
def optimize_free(target_high, target_low,
R_range=(min(R_set), max(R_set)),
C_range=(min(C_set), max(C_set))):
"""Optimize components given a range of allowable values.
:param target_high: Time that the oscillations should be high (secs).
:param target_low: Time that the oscillations should be low (secs).
:param R_range: Bounds of allowable resistor values
:param C_range: Bounds of allowable capacitor values
:type target_high: float (seconds)
:type target_low: float (seconds)
:type R_range: tuple of floats. (min, max) (in Ohms)
:type C_range: tuple of floats. (min, max) (in Farads)
:returns: values for R1, R2, and C; actual value for time_high and time_low
:rtype: list of floats. [R1, R2, C, time_high, time_low]
"""
R1, R2, C = brute(score_free, [R_range, R_range, C_range],
args=(target_high, target_low),
Ns= 50)
th = time_high(R1, R2, C)
tl = time_low(R2, C)
return [R1, R2, C, th, tl]
def optimize_free(target_high,
target_low,
R_range=(min(R_set), max(R_set)),
C_range=(min(C_set), max(C_set))):
"""Optimize components given a range of allowable values.
:param target_high: Time that the oscillations should be high (secs).
:param target_low: Time that the oscillations should be low (secs).
:param R_range: Bounds of allowable resistor values
:param C_range: Bounds of allowable capacitor values
:type target_high: float (seconds)
:type target_low: float (seconds)
:type R_range: tuple of floats. (min, max) (in Ohms)
:type C_range: tuple of floats. (min, max) (in Farads)
:returns: values for R1, R2, and C; actual value for time_high and time_low
:rtype: list of floats. [R1, R2, C, time_high, time_low]
"""
R1, R2, C = brute(score_free, [R_range, R_range, C_range],
args=(target_high, target_low),
Ns=50)
th = time_high(R1, R2, C)
tl = time_low(R2, C)
return [R1, R2, C, th, tl]
def optimize(target_high, target_low, R_set=R_set, C_set=C_set):
"""Optimize for a set of available components
:param target_high: Time that the oscillations should be high (secs).
:param target_low: Time that the oscillations should be low (secs).
:param R_set: Available resistor values
:param C_set: Available capacitor values
:type target_high: float (seconds)
:type target_low: float (seconds)
:type R_set: ordered list of floats (in Ohms)
:type C_set: ordered list of floats (in Farads)
:returns: values for R1, R2, and C; actual value for time_high and time_low
:rtype: list of floats. [R1, R2, C, time_high, time_low]
"""
# Calculate bounds
MAX_R = len(R_set) - 1
MAX_C = len(C_set) - 1
lower = [0, 0, 0]
upper = [MAX_R, MAX_R, MAX_C]
# Optimize
x_vals = brute(score,
zip(lower, upper),
args=(target_high, target_low, R_set, C_set))
r1_ix = int(round(x_vals[0]))
r2_ix = int(round(x_vals[1]))
c_ix = int(round(x_vals[2]))
R1 = R_set[r1_ix]
R2 = R_set[r2_ix]
C = C_set[c_ix]
th = time_high(R1, R2, C)
tl = time_low(R2, C)
return [R1, R2, C, th, tl]
def optimize(target_high, target_low, R_set=R_set, C_set=C_set):
"""Optimize for a set of available components
:param target_high: Time that the oscillations should be high (secs).
:param target_low: Time that the oscillations should be low (secs).
:param R_set: Available resistor values
:param C_set: Available capacitor values
:type target_high: float (seconds)
:type target_low: float (seconds)
:type R_set: ordered list of floats (in Ohms)
:type C_set: ordered list of floats (in Farads)
:returns: values for R1, R2, and C; actual value for time_high and time_low
:rtype: list of floats. [R1, R2, C, time_high, time_low]
"""
# Calculate bounds
MAX_R = len(R_set) - 1
MAX_C = len(C_set) - 1
lower = [0, 0, 0]
upper = [MAX_R, MAX_R, MAX_C]
# Optimize
x_vals = brute(score, zip(lower, upper),
args=(target_high, target_low, R_set, C_set))
r1_ix = int(round(x_vals[0]))
r2_ix = int(round(x_vals[1]))
c_ix = int(round(x_vals[2]))
R1 = R_set[r1_ix]
R2 = R_set[r2_ix]
C = C_set[c_ix]
th = time_high(R1, R2, C)
tl = time_low(R2, C)
return [R1, R2, C, th, tl]
C_range = [1e-12, 1000e-6]
HIGH_TARGET = 42.0
LOW_TARGET = 15
def score(x):
R1, R2, C = x
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - HIGH_TARGET)
low_d = abs(low - LOW_TARGET)
# Tweak error function to best fit requirements
return high_d + low_d
results = brute(score, [R_range, R_range, C_range], Ns=50)
print "Final"
R1, R2, C = results
print "R1: %.3e Ohms" % R1
print "R2: %.3e Ohms" % R2
print "C: %.3e F" % C
print "Time High: %.3f" % time_high(R1, R2, C)
print "Time Low: %.3f" % time_low(R2, C)
LOW_TARGET = 15
def score(x):
R1,R2,C = x
high = time_high(R1, R2, C)
low = time_low(R2, C)
high_d = abs(high - HIGH_TARGET)
low_d = abs(low - LOW_TARGET)
# Tweak error function to best fit requirements
return high_d + low_d
results = brute(score, [R_range, R_range, C_range], Ns= 50)
print "Final"
R1, R2, C = results
print "R1: %.3e Ohms" % R1
print "R2: %.3e Ohms" % R2
print "C: %.3e F" % C
print "Time High: %.3f" % time_high(R1, R2, C)
print "Time Low: %.3f" % time_low(R2, C)