## Question

Asked By – Paul

I’ve got the following simple script that plots a graph:

```
import matplotlib.pyplot as plt
import numpy as np
T = np.array([6, 7, 8, 9, 10, 11, 12])
power = np.array([1.53E+03, 5.92E+02, 2.04E+02, 7.24E+01, 2.72E+01, 1.10E+01, 4.70E+00])
plt.plot(T,power)
plt.show()
```

As it is now, the line goes straight from point to point which looks ok, but could be better in my opinion. What I want is to smooth the line between the points. In Gnuplot I would have plotted with `smooth cplines`

.

Is there an easy way to do this in PyPlot? I’ve found some tutorials, but they all seem rather complex.

**Now we will see solution for issue: Plot smooth line with PyPlot **

## Answer

You could use `scipy.interpolate.spline`

to smooth out your data yourself:

```
from scipy.interpolate import spline
# 300 represents number of points to make between T.min and T.max
xnew = np.linspace(T.min(), T.max(), 300)
power_smooth = spline(T, power, xnew)
plt.plot(xnew,power_smooth)
plt.show()
```

spline is deprecated in scipy 0.19.0, use BSpline class instead.

Switching from `spline`

to `BSpline`

isn’t a straightforward copy/paste and requires a little tweaking:

```
from scipy.interpolate import make_interp_spline, BSpline
# 300 represents number of points to make between T.min and T.max
xnew = np.linspace(T.min(), T.max(), 300)
spl = make_interp_spline(T, power, k=3) # type: BSpline
power_smooth = spl(xnew)
plt.plot(xnew, power_smooth)
plt.show()
```

This question is answered By – Olivier Verdier

**This answer is collected from stackoverflow and reviewed by FixPython community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 **