numpy 數組抽取,提取numpy數組中的特定列

This is an easy question but say I have an MxN matrix. All I want to do is extract specific columns and store them in another numpy array but I get invalid syntax errors.

Here is the code:

extractedData = data[[:,1],[:,9]].

It seems like the above line should suffice but I guess not. I looked around but couldn't find anything syntax wise regarding this specific scenario.

解決方案

I assume you wanted columns 1 and 9? That's

data[:, [1, 9]]

Or with names:

data[:, ['Column Name1','Column Name2']]

You can get the names from data.dtype.names…