How to save different numpy arrays with np.savetxt?

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I would like to save different numpy arrays with np.savetxt('xx.csv'). The np.arrays are (m,n) and I would like to add before the first column a list of index and above each line a list of header. Both lists consist of strings.



When I do multiple savetxt it erased the previous values.



I considered creating a huge matrix by merging every numpy arrays but doubt about the optimality.



Thanks for your help










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  • I would like to have a blank line between each arrays
    – Spenrose
    Dec 27 '18 at 16:55










  • You need to open the file in append mode, and pass the opened file to the savetxt function. Write any spacer lines directly. If you give savetxt a filename, it creates a new file in write mode, effectively deleting anything you wrote to that name before.
    – hpaulj
    Dec 27 '18 at 18:06












  • Nice, that works. thanks!
    – Spenrose
    Dec 28 '18 at 12:29
















0














I would like to save different numpy arrays with np.savetxt('xx.csv'). The np.arrays are (m,n) and I would like to add before the first column a list of index and above each line a list of header. Both lists consist of strings.



When I do multiple savetxt it erased the previous values.



I considered creating a huge matrix by merging every numpy arrays but doubt about the optimality.



Thanks for your help










share|improve this question






















  • I would like to have a blank line between each arrays
    – Spenrose
    Dec 27 '18 at 16:55










  • You need to open the file in append mode, and pass the opened file to the savetxt function. Write any spacer lines directly. If you give savetxt a filename, it creates a new file in write mode, effectively deleting anything you wrote to that name before.
    – hpaulj
    Dec 27 '18 at 18:06












  • Nice, that works. thanks!
    – Spenrose
    Dec 28 '18 at 12:29














0












0








0







I would like to save different numpy arrays with np.savetxt('xx.csv'). The np.arrays are (m,n) and I would like to add before the first column a list of index and above each line a list of header. Both lists consist of strings.



When I do multiple savetxt it erased the previous values.



I considered creating a huge matrix by merging every numpy arrays but doubt about the optimality.



Thanks for your help










share|improve this question













I would like to save different numpy arrays with np.savetxt('xx.csv'). The np.arrays are (m,n) and I would like to add before the first column a list of index and above each line a list of header. Both lists consist of strings.



When I do multiple savetxt it erased the previous values.



I considered creating a huge matrix by merging every numpy arrays but doubt about the optimality.



Thanks for your help







python-3.x pandas numpy






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Dec 27 '18 at 16:42









Spenrose

255




255












  • I would like to have a blank line between each arrays
    – Spenrose
    Dec 27 '18 at 16:55










  • You need to open the file in append mode, and pass the opened file to the savetxt function. Write any spacer lines directly. If you give savetxt a filename, it creates a new file in write mode, effectively deleting anything you wrote to that name before.
    – hpaulj
    Dec 27 '18 at 18:06












  • Nice, that works. thanks!
    – Spenrose
    Dec 28 '18 at 12:29


















  • I would like to have a blank line between each arrays
    – Spenrose
    Dec 27 '18 at 16:55










  • You need to open the file in append mode, and pass the opened file to the savetxt function. Write any spacer lines directly. If you give savetxt a filename, it creates a new file in write mode, effectively deleting anything you wrote to that name before.
    – hpaulj
    Dec 27 '18 at 18:06












  • Nice, that works. thanks!
    – Spenrose
    Dec 28 '18 at 12:29
















I would like to have a blank line between each arrays
– Spenrose
Dec 27 '18 at 16:55




I would like to have a blank line between each arrays
– Spenrose
Dec 27 '18 at 16:55












You need to open the file in append mode, and pass the opened file to the savetxt function. Write any spacer lines directly. If you give savetxt a filename, it creates a new file in write mode, effectively deleting anything you wrote to that name before.
– hpaulj
Dec 27 '18 at 18:06






You need to open the file in append mode, and pass the opened file to the savetxt function. Write any spacer lines directly. If you give savetxt a filename, it creates a new file in write mode, effectively deleting anything you wrote to that name before.
– hpaulj
Dec 27 '18 at 18:06














Nice, that works. thanks!
– Spenrose
Dec 28 '18 at 12:29




Nice, that works. thanks!
– Spenrose
Dec 28 '18 at 12:29

















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