Luc - 9 months ago 35

Python Question

This gives an syntax error:

`import numpy as np`

import scipy.interpolate

import matplotlib.pyplot as plt

y = np.array([-0.23122875, -0.11375591, -0.09760733, -0.07401004, -0.03565704,-0.02449268,-0.01411058,0.0018971,-0.0145346,0.00156783,0.0048691,0.01990767,0.02048657,0.01691803,0.02228818,0.02578349,0.02707902,0.01996198])

x = np.array(range(len(y)))

stepsize = 0.0001

xvals = np.arange(0,13.0001,stepsize)

func = scipy.interpolate.interp1d(x, y, kind = "cubic")

yvals = func(xvals)

plt.plot(xvals,yvals)

plt.plot(x,y, "o")

dif = np.diff(yvals)

for i in range(len(y))

if i == 0:

print dif[int(i*1/stepsize)]

else:

print dif[int(i*1/stepsize)-1]

It gives an syntax error in line 5 like this

y = np.array([-0.23122875, -0.11375591, -0.09760733, -0.07401004, -0.03565704,-0.02449268,-0.01411058,0.0018971,-0.0145346,0.00156783,0.0048691,0.01990767,0.02048657,0.01691803,0.02228818,0.02578349,0.02707902,0.01996198])

^

SyntaxError: invalid syntax

I just do not know why. When I change some of the values in y, it suddenly does work.

Thanks in advance

Answer

You appear to be using a soft hyphen on this line:

```
y = np.array([-0.23122875, -0.11375591, -0.09760733, -0.07401004, -0.03565704,-0.02449268,-0.01411058,0.0018971,-0.0145346,0.00156783,0.0048691,0.01990767,0.02048657,0.01691803,0.02228818,0.02578349,0.02707902,0.01996198])
```

You need to switch it to a hyphen-minus like this:

```
y = np.array([-0.23122875, -0.11375591, -0.09760733, -0.07401004, -0.03565704,-0.02449268,-0.01411058,0.0018971,-0.0145346,0.00156783,0.0048691,0.01990767,0.02048657,0.01691803,0.02228818,0.02578349,0.02707902,0.01996198])
```