Numerical integration with scipy.integrate.trapz returns a result but scipy.integrate.simps does not
0
I am trying to integrate the following data numerically:
t,y
9.960000000000001e-05,8.334379999999999e-05
9.98e-05,0.000126125
0.0001,0.00018125
0.0001002,0.0002385
0.00010040000000000001,0.000289625
0.0001006,0.000347313
0.0001008,0.000391719
0.000101,0.00043284399999999994
0.00010120000000000001,0.000472375
0.00010140000000000001,0.000502469
0.00010160000000000002,0.000528594
0.00010180000000000001,0.000546219
0.000102,0.000569188
0.0001022,0.000584719
0.0001024,0.000593969
0.00010260000000000001,0.000607375
0.0001028,0.000618906
0.000103,0.000629344
0.0001032,0.000629344
0.0001034,0.000636313
0.00010360000000000001,0.0006374999999999999
0.0001038,0.000630375
0.00010400000000000001,0.00059875
0.0001042,0.00046825
0.0001044,0.000287344
0.00010460000000000002,0.000208594
0.0001048,0.000196094
0.000105,0.000172625
0.00010520000000000001,0.000134781
0.0001054,0.000115906
0.0001056,0.00010306300000000001
0.00010580000000000001,9.31563e-05
As shown below, I read this data set from a csv file.
This is my code:
import pandas as pd
from scipy.integrate import trapz, simps
root="my/root/dir"
df = pd.read_csv(root+r"simps.csv")
print(trapz(df["t"], df["y"]))
print(simps(df["t"], df["y"]))
trapz returns a value (-9.5865055e-10) while simps returns nan and the following error:
anacondapathscipyintegratequadrature.py:324: RuntimeWarning: divide by zero encountered in true_divide
h0divh1 = h0 / h1
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: divide by zero encountered in true_divide
y[slice1]*hsum*hsum/hprod +
anacondapathscipyintegratequadrature.py:327: RuntimeWarning: invalid value encountered in add
y[slice2]*(2-h0divh1))
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: invalid value encountered in add
y[slice1]*hsum*hsum/hprod +
Why does this error occur?
python math scipy integrate
asked Nov 16 '18 at 7:45
plane loverplane lover
234
add a comment |
0
I am trying to integrate the following data numerically:
t,y
9.960000000000001e-05,8.334379999999999e-05
9.98e-05,0.000126125
0.0001,0.00018125
0.0001002,0.0002385
0.00010040000000000001,0.000289625
0.0001006,0.000347313
0.0001008,0.000391719
0.000101,0.00043284399999999994
0.00010120000000000001,0.000472375
0.00010140000000000001,0.000502469
0.00010160000000000002,0.000528594
0.00010180000000000001,0.000546219
0.000102,0.000569188
0.0001022,0.000584719
0.0001024,0.000593969
0.00010260000000000001,0.000607375
0.0001028,0.000618906
0.000103,0.000629344
0.0001032,0.000629344
0.0001034,0.000636313
0.00010360000000000001,0.0006374999999999999
0.0001038,0.000630375
0.00010400000000000001,0.00059875
0.0001042,0.00046825
0.0001044,0.000287344
0.00010460000000000002,0.000208594
0.0001048,0.000196094
0.000105,0.000172625
0.00010520000000000001,0.000134781
0.0001054,0.000115906
0.0001056,0.00010306300000000001
0.00010580000000000001,9.31563e-05
As shown below, I read this data set from a csv file.
This is my code:
import pandas as pd
from scipy.integrate import trapz, simps
root="my/root/dir"
df = pd.read_csv(root+r"simps.csv")
print(trapz(df["t"], df["y"]))
print(simps(df["t"], df["y"]))
trapz returns a value (-9.5865055e-10) while simps returns nan and the following error:
anacondapathscipyintegratequadrature.py:324: RuntimeWarning: divide by zero encountered in true_divide
h0divh1 = h0 / h1
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: divide by zero encountered in true_divide
y[slice1]*hsum*hsum/hprod +
anacondapathscipyintegratequadrature.py:327: RuntimeWarning: invalid value encountered in add
y[slice2]*(2-h0divh1))
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: invalid value encountered in add
y[slice1]*hsum*hsum/hprod +
Why does this error occur?
python math scipy integrate
asked Nov 16 '18 at 7:45
plane loverplane lover
234
add a comment |
0
0
0
I am trying to integrate the following data numerically:
t,y
9.960000000000001e-05,8.334379999999999e-05
9.98e-05,0.000126125
0.0001,0.00018125
0.0001002,0.0002385
0.00010040000000000001,0.000289625
0.0001006,0.000347313
0.0001008,0.000391719
0.000101,0.00043284399999999994
0.00010120000000000001,0.000472375
0.00010140000000000001,0.000502469
0.00010160000000000002,0.000528594
0.00010180000000000001,0.000546219
0.000102,0.000569188
0.0001022,0.000584719
0.0001024,0.000593969
0.00010260000000000001,0.000607375
0.0001028,0.000618906
0.000103,0.000629344
0.0001032,0.000629344
0.0001034,0.000636313
0.00010360000000000001,0.0006374999999999999
0.0001038,0.000630375
0.00010400000000000001,0.00059875
0.0001042,0.00046825
0.0001044,0.000287344
0.00010460000000000002,0.000208594
0.0001048,0.000196094
0.000105,0.000172625
0.00010520000000000001,0.000134781
0.0001054,0.000115906
0.0001056,0.00010306300000000001
0.00010580000000000001,9.31563e-05
As shown below, I read this data set from a csv file.
This is my code:
import pandas as pd
from scipy.integrate import trapz, simps
root="my/root/dir"
df = pd.read_csv(root+r"simps.csv")
print(trapz(df["t"], df["y"]))
print(simps(df["t"], df["y"]))
trapz returns a value (-9.5865055e-10) while simps returns nan and the following error:
anacondapathscipyintegratequadrature.py:324: RuntimeWarning: divide by zero encountered in true_divide
h0divh1 = h0 / h1
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: divide by zero encountered in true_divide
y[slice1]*hsum*hsum/hprod +
anacondapathscipyintegratequadrature.py:327: RuntimeWarning: invalid value encountered in add
y[slice2]*(2-h0divh1))
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: invalid value encountered in add
y[slice1]*hsum*hsum/hprod +
Why does this error occur?
python math scipy integrate
asked Nov 16 '18 at 7:45
plane loverplane lover
234
I am trying to integrate the following data numerically:
t,y
9.960000000000001e-05,8.334379999999999e-05
9.98e-05,0.000126125
0.0001,0.00018125
0.0001002,0.0002385
0.00010040000000000001,0.000289625
0.0001006,0.000347313
0.0001008,0.000391719
0.000101,0.00043284399999999994
0.00010120000000000001,0.000472375
0.00010140000000000001,0.000502469
0.00010160000000000002,0.000528594
0.00010180000000000001,0.000546219
0.000102,0.000569188
0.0001022,0.000584719
0.0001024,0.000593969
0.00010260000000000001,0.000607375
0.0001028,0.000618906
0.000103,0.000629344
0.0001032,0.000629344
0.0001034,0.000636313
0.00010360000000000001,0.0006374999999999999
0.0001038,0.000630375
0.00010400000000000001,0.00059875
0.0001042,0.00046825
0.0001044,0.000287344
0.00010460000000000002,0.000208594
0.0001048,0.000196094
0.000105,0.000172625
0.00010520000000000001,0.000134781
0.0001054,0.000115906
0.0001056,0.00010306300000000001
0.00010580000000000001,9.31563e-05
As shown below, I read this data set from a csv file.
This is my code:
import pandas as pd
from scipy.integrate import trapz, simps
root="my/root/dir"
df = pd.read_csv(root+r"simps.csv")
print(trapz(df["t"], df["y"]))
print(simps(df["t"], df["y"]))
trapz returns a value (-9.5865055e-10) while simps returns nan and the following error:
anacondapathscipyintegratequadrature.py:324: RuntimeWarning: divide by zero encountered in true_divide
h0divh1 = h0 / h1
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: divide by zero encountered in true_divide
y[slice1]*hsum*hsum/hprod +
anacondapathscipyintegratequadrature.py:327: RuntimeWarning: invalid value encountered in add
y[slice2]*(2-h0divh1))
anacondapathscipyintegratequadrature.py:326: RuntimeWarning: invalid value encountered in add
y[slice1]*hsum*hsum/hprod +
Why does this error occur?
python math scipy integrate
python math scipy integrate
asked Nov 16 '18 at 7:45
plane loverplane lover
234
asked Nov 16 '18 at 7:45
plane loverplane lover
234
asked Nov 16 '18 at 7:45
plane loverplane lover
234
asked Nov 16 '18 at 7:45
plane loverplane lover
234
asked Nov 16 '18 at 7:45
plane loverplane lover
234
234
add a comment |
add a comment |
1 Answer
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A very stupid mistake: I exchanged x and y. Simps requires y as a first argument
answered Nov 16 '18 at 14:46
plane loverplane lover
234
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
A very stupid mistake: I exchanged x and y. Simps requires y as a first argument
answered Nov 16 '18 at 14:46
plane loverplane lover
234
add a comment |
0
A very stupid mistake: I exchanged x and y. Simps requires y as a first argument
answered Nov 16 '18 at 14:46
plane loverplane lover
234
add a comment |
0
0
0
A very stupid mistake: I exchanged x and y. Simps requires y as a first argument
answered Nov 16 '18 at 14:46
plane loverplane lover
234
A very stupid mistake: I exchanged x and y. Simps requires y as a first argument
answered Nov 16 '18 at 14:46
plane loverplane lover
234
answered Nov 16 '18 at 14:46
plane loverplane lover
234
answered Nov 16 '18 at 14:46
plane loverplane lover
234
answered Nov 16 '18 at 14:46
plane loverplane lover
234
234
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