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问题描述
我有一个带有多个值的netcdf文件< 0.我想用一个值替换所有的值(例如-1).如何使用netCDF4做到这一点?我正在这样读取文件:
I have a netcdf file with several values < 0. I would like to replace all of them with a single value (say -1). How do I do that using netCDF4? I am reading in the file like this:
import netCDF4
dset = netCDF4.Dataset('test.nc')
dset[dset.variables['var'] < 0] = -1
推荐答案
如果要将数据保留在netCDF变量对象中,这应该可以工作:
If you want to keep the data in the netCDF variable object, this should work:
import netCDF4
dset = netCDF4.Dataset('test.nc', 'r+')
dset['var'][:][dset['var'][:] < 0] = -1
dset.close() # if you want to write the variable back to disk
如果您不想写回磁盘,请继续获取numpy数组并对其切片/分配:
If you don't want to write back to disk, go ahead and just get the numpy array and slice/assign to it:
data = dset['sea_ice_cover'][:] # data is a numpy array
data[data < 0] = -1
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