In [28]:

    

import netCDF4
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline
import datetime as dt
import ipywidgets as widgets
from functools import partial
import traitlets
from IPython.display import display


    

In [2]:

    

url='http://geoport.whoi.edu/thredds/dodsC/usgs/data2/emontgomery/stellwagen/Data/FI14/10001whr-cal.nc'


    

In [3]:

    

nc = netCDF4.Dataset(url)
ncv = nc.variables


    

In [4]:

    

def convert_epic_time(ncv):
    """ convert EPIC time and time2 variables to datenum64 """
    t1 = np.array(ncv['time'][:] - 2440588, dtype='int64')*3600*24*1000
    t2 = np.array(ncv['time2'][:], dtype='int64')
    return pd.to_datetime(t1+t2,unit='ms')


    

In [5]:

    

# if we find a time2 variable, convert EPIC time and time2 variables to datetime64 object
if 'time2' in ncv.keys():
    dt = convert_epic_time(ncv)


    

In [6]:

    

dt[0]


    

    
Out[6]:





Timestamp('2014-02-07 14:51:29.999000')

In [7]:

    

dt.shape


    

    
Out[7]:





(2134L,)

In [8]:

    

ncv['press']


    

    
Out[8]:





<type 'netCDF4._netCDF4.Variable'>
int16 press(time, sample, lat, lon)
unlimited dimensions: 
current shape = (2134, 2048, 1, 1)
filling off

In [9]:

    

itime = 200


    

In [10]:

    

print(dt[itime])


    

    




2014-02-15 22:51:30

In [11]:

    

def my_plot(var_name='press',itime=0):
    var = ncv[var_name]
    plt.plot(var[itime,:,:,:].ravel())
    plt.title(dt[itime])


    

In [12]:

    

my_plot(var_name='press',itime=itime)


    

In [13]:

    

int(dt.shape[0])


    

    
Out[13]:





2134

In [14]:

    

widgets.interact(my_plot, itime=(0,int(dt.shape[0]),1), var_name=ncv.keys() )


    

    






None






    
Out[14]:





<function __main__.my_plot>






    

In [34]:

    

class Counter(widgets.DOMWidget):
    value = traitlets.CInt(0, sync=True)


    

In [35]:

    

def button_plus('>'):
    counter.value +=1  
    
def button_minus(counter):
    counter.value(-1)


    

In [ ]:

    




    

In [36]:

    

counter = Counter()

#wplus = widgets.Button(description='>')


#wminus = widgets.Button(description='<')

# integer slider
wpick = widgets.IntSlider(value=0,min=0,max=10,step=1,description="time step")

wplus.on_click(button_plus)
wminus.on_click(button_minus)

display(wminus, wpick, wplus)


    

    




---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-35-f6dbdef1af92> in button_plus(counter)
      1 def button_plus(counter):
----> 2     counter.value +=1
      3 
      4 def button_minus(counter):
      5     counter.value(-1)

AttributeError: 'Button' object has no attribute 'value'





    




---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-35-f6dbdef1af92> in button_plus(counter)
      1 def button_plus(counter):
----> 2     counter.value +=1
      3 
      4 def button_minus(counter):
      5     counter.value(-1)

AttributeError: 'Button' object has no attribute 'value'

In [37]:

    

counter.value


    

    
Out[37]:





0

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