问题描述
我正在为这个问题苦苦挣扎: 我有2个大型2D numpy数组(大约5 GB),我想将它们保存在可从Matlab加载的.mat文件中 我尝试了scipy.io并写了
from scipy.io import savemat
data = {'A': a,'B': b}
savemat('myfile.mat',data,appendmat=True,format='5',long_field_names=False,do_compression=False,oned_as='row')
但出现错误: OverflowError:Python int太大,无法转换为C long
编辑: Python 3.8,Matlab 2017b
在这里追溯
类型
b.shape(1048261)类型为
data = {'A': a,oned_as='row')
---------------------------------------------------------------------------
OverflowError Traceback (most recent call last)
<ipython-input-19-4d1d08a54148> in <module>
1 data = {'A': a,'B': b}
----> 2 savemat('myfile.mat',3 long_field_names=False,oned_as='row')
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio.py in savemat(file_name,mdict,appendmat,format,long_field_names,do_compression,oned_as)
277 else:
278 raise ValueError("Format should be '4' or '5'")
--> 279 MW.put_variables(mdict)
280
281
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio5.py in put_variables(self,write_header)
847 self.file_stream.write(out_str)
848 else: # not compressing
--> 849 self._matrix_writer.write_top(var,asbytes(name),is_global)
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio5.py in write_top(self,arr,name,is_global)
588 self._var_name = name
589 # write the header and data
--> 590 self.write(arr)
591
592 def write(self,arr):
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio5.py in write(self,arr)
627 self.write_char(narr,codec)
628 else:
--> 629 self.write_numeric(narr)
630 self.update_matrix_tag(mat_tag_pos)
631
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio5.py in write_numeric(self,arr)
653 self.write_element(arr.imag)
654 else:
--> 655 self.write_element(arr)
656
657 def write_char(self,codec='ascii'):
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio5.py in write_element(self,mdtype)
494 self.write_smalldata_element(arr,mdtype,byte_count)
495 else:
--> 496 self.write_regular_element(arr,byte_count)
497
498 def write_smalldata_element(self,byte_count):
~\miniconda3\envs\work\lib\site-packages\scipy\io\matlab\mio5.py in write_regular_element(self,byte_count)
508 tag = np.zeros((),NDT_TAG_FULL)
509 tag['mdtype'] = mdtype
--> 510 tag['byte_count'] = byte_count
511 self.write_bytes(tag)
512 self.write_bytes(arr)
OverflowError: Python int too large to convert to C long
我也尝试过使用hdf5storage
hdf5storage.write(data,'myfile.mat',matlab_compatible=True)
但是它也失败了。
编辑:
给出此警告
\miniconda3\envs\work\lib\site-packages\hdf5storage\__init__.py:1306:
H5pyDeprecationWarning: The default file mode will change to 'r' (read-only)
in h5py 3.0. To suppress this warning,pass the mode you need to
h5py.File(),or set the global default h5.get_config().default_file_mode,or
set the environment variable H5PY_DEFAULT_READONLY=1. Available modes are:
'r','r+','w','w-'/'x','a'. See the docs for details.
f = h5py.File(filename)
无论如何,它会创建一个5GB的文件,但是当我将其加载到Matlab中时,会得到一个带有文件路径且显然没有数据的变量。
最后我尝试使用h5py:
import h5py
hf = h5py.File('C:/Users/flavio/Desktop/STRA-pattern.mat','w')
hf.create_dataset('A',data=a)
hf.create_dataset('B',data=b)
hf.close()
解决方法
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