antonv wrote:
> Scott, the Scatter function works great but i am really looking to use the
> contourf one.
>
> Eric, you're right, the way I had it initially it was missing the z value. I
> looked at the griddata example and here is the code I came up with:
>
Since you read your data from a GRIB file, it must be on a regular
grid. Therefore, you don't need to use griddata to grid your data.
The best way to go would be to use PyNIO to read the grib data into a 2D
array, and then plot it directly with contourf (perhaps using the
Basemap toolkit if you want to display a map underneath).
If you point me to your GRIB file I can show you what I mean.
-Jeff
> from numpy.random import uniform, seed
> from matplotlib.mlab import griddata
> import matplotlib.pyplot as plt
> import numpy as np
>
> r =
> mlab.csv2rec('D:/SocalScubaInfo/Data/Outputs/CSV_files/DIRPW_12191800.csv')
>
> x = r.longitude
> y = r.latitude
> z = r.dirpw_200812191800
> xi = r.x
> yi = r.y
>
> # grid the data.
> zi = griddata(x,y,z,xi,yi)
>
> CS = plt.contourf(xi,yi,zi,15,cmap=plt.cm.jet)
> plt.colorbar() # draw colorbar
>
> plt.show()
>
>
> Which still errors out: 'output grid defined by xi,yi must be monotone
> increasing'
> The xi and yi are from the first 2 columns of the csv file and I thought
> they were monotonically increasing. What am I missing?
>
> antonv wrote:
>
>> Hi all,
>>
>> I am pretty new to matplotlib and I have a big issue... I am trying to
>> plot data from a grib file from noaa and I am not sure what's the best way
>> to go about it. Until now, I am extracting the data i need in CSV files
>> but I am not able to plot it. Here is a sample of the code that I am
>> using:
>>
>> import matplotlib.pyplot as plt
>> import matplotlib.mlab as mlab
>>
>> r =
>> mlab.csv2rec('D:/SocalScubaInfo/Data/Outputs/CSV_files/DIRPW_12191800.csv')
>> plt.contour(r.longitude, r.latitude)
>> plt.show()
>>
>> Which errors out and requires a 2d array.
>>
>> By the way, here is a data file: http://downloads.75ive.com/testdata.csv
>> http://downloads.75ive.com/testdata.csv
>>
>> Any help is appreciated!
>>
>>
>
>
------------------------------------------------------------------------------
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
