[Numpy-discussion] find location of maximum values

[questions anon]

ok thanks, a quick try at using it resulted in:
IndexError: index out of bounds
but I may need to do abit more investigating to understand how it works.
thanks

On Wed, Dec 21, 2011 at 2:20 PM, Olivier Delalleau <shish at keba.be> wrote:

> I'm sorry I don't have time to look closely at your code and this may not
> be helpful, but just in case... I find it suspicious that you *seem* (by
> quickly glancing at the code) to be taking TIME[max(temperature)] instead
> of TIME[argmax(temperature)].
>
> -=- Olivier
>
> 2011/12/20 questions anon <questions.anon at gmail.com>
>
>> I have a netcdf file that contains hourly temperature data for a whole
>> month. I would like to find the maximum temperature within that file and
>> also the corresponding Latitude and Longitude and Time and then plot this.
>> Below is the code I have so far. I think everything is working except for
>> identifying the corresponding latitude and longitude. The latitude and
>> longitude always seems to be in the same area (from file to file) and they
>> are not where the maximum values are occurring.
>> Any feedback will be greatly appreciated.
>>
>> from netCDF4 import Dataset
>> import matplotlib.pyplot as plt
>> import numpy as N
>> from mpl_toolkits.basemap import Basemap
>> from netcdftime import utime
>> from datetime import datetime
>> from numpy import ma as MA
>> import os
>>
>> TSFCall=[]
>>
>> for (path, dirs, files) in os.walk(MainFolder):
>>     for dir in dirs:
>>         print dir
>>     path=path+'/'
>>     for ncfile in files:
>>         if ncfile[-3:]=='.nc':
>>             print "dealing with ncfiles:", path+ncfile
>>             ncfile=os.path.join(path,ncfile)
>>             ncfile=Dataset(ncfile, 'r+', 'NETCDF4')
>>             TSFC=ncfile.variables['T_SFC'][:]
>>             TIME=ncfile.variables['time'][:]
>>             LAT=ncfile.variables['latitude'][:]
>>             LON=ncfile.variables['longitude'][:]
>>             ncfile.close()
>>
>>             TSFCall.append(TSFC)
>>
>> big_array=N.ma.concatenate(TSFCall)
>> tmax=MA.max(TSFC)
>> print tmax
>> t=TIME[tmax]
>> indexTIME=N.where(TIME==t)
>> TSFCmax=TSFC[tmax]
>> print t, indexTIME
>> print LAT[tmax], LON[tmax], TSFCmax
>>
>> cdftime=utime('seconds since 1970-01-01 00:00:00')
>> ncfiletime=cdftime.num2date(t)
>> print ncfiletime
>> timestr=str(ncfiletime)
>> d = datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S')
>> date_string = d.strftime('%Y%m%d_%H%M')
>>
>> map =
>> Basemap(projection='merc',llcrnrlat=-40,urcrnrlat=-33,llcrnrlon=139.0,urcrnrlon=151.0,lat_ts=0,resolution='i')
>> x,y=map(*N.meshgrid(LON,LAT))
>> map.tissot(LON[tmax], LAT[tmax], 0.15, 100, facecolor='none',
>> edgecolor='black', linewidth=2)
>> map.readshapefile(shapefile1, 'DSE_REGIONS')
>> map.drawcoastlines(linewidth=0.5)
>> map.drawstates()
>> plt.title('test'+' %s'%date_string)
>> ticks=[-5,0,5,10,15,20,25,30,35,40,45,50]
>> CS = map.contourf(x,y,TSFCmax, 15, cmap=plt.cm.jet)
>> l,b,w,h =0.1,0.1,0.8,0.8
>> cax = plt.axes([l+w+0.025, b, 0.025, h], )
>> cbar=plt.colorbar(CS, cax=cax, drawedges=True)
>>
>> plt.show()
>> plt.close()
>>
>>
>>
>>
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>>
>
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