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If the ndarray object is a structured array the fields of the array can be accessed by indexing the array with strings, dictionary-like. For such a subclass it may be preferable to call ndarray. All arrays generated by basic slicing are always views of the original array. Basic slicing with more than one non- : entry in the slicing tuple, acts like repeated application of slicing using a single non- : entry, where the non- : entries are successively taken with all other non- : entries replaced by :. However, if any other error such as an out of bounds index occurs, the array will remain unchanged. The added dimension is the position of the newaxis object in the selection tuple. Care must be taken when extracting a small portion from a large array which becomes useless after the extraction, because the small portion extracted contains a reference to the large original array whose memory will not be released until all arrays derived from it are garbage-collected. Slice objects can be used in the construction in place of the [start:stop:step] notation. At the same time columns 0 and 2 should be selected with an advanced integer index.

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