By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I then want to remove 3,4,7 from a. Use numpy. Note that numpy. Note that delete does not occur in-place A Numpy array is immutablemeaning you technically cannot delete an item from it.

However, you can construct a new array without the values you don't want, like this:. According to my tests, this outperforms numpy.

## numpy.delete

I don't know why that would be the case, maybe due to the small size of the initial array? That's a pretty significant difference in the opposite direction to what I was expectinganyone have any idea why this would be the case? Even more weirdly, passing numpy. Edit: It does appear to be to do with the size of the array. With large arrays, numpy. Obviously, this is all pretty irrelevant, as you should always go for clarity and avoid reinventing the wheel, but I found it a little interesting, so I thought I'd leave it here.

Using np. However, for completeness, let me add another way of "removing" array elements using a boolean mask created with the help of np. This method allows us to remove the elements by specifying them directly or by their indices:.

Remove by elements don't forget to recreate the original a since it was rewritten in the previous line :. Learn more. How to remove specific elements in a numpy array Ask Question.

**4. How to Uninstall Python on Windows OS-How to Uninstall Python on Windows Machine-Uninstall Python**

Asked 7 years, 10 months ago. Active 13 days ago. Viewed k times. How can I remove some specific elements from a numpy array?GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Sign in to your account. I am not sure "conda install numpy" should ever work, there are multiple versions of numpy I think the user should have to specify.

But there should certainly be a better error message. This is a pretty easy fix but I think it can wait for a conda point release in a few weeks. The other avenue is to prevent people from removing numpy and python. The idea is that environments are cheap ala git branchesand the user can just create a new one with a different, or no version of numpy.

### python numpy が importエラーになる

I will check in a fix for that, at least. When first trying to install numpy on a fresh copy it is not allowed: conda install numpy conda: error: changing numpy versions in an existing Anaconda environment is not supported create a new environment.

Yet for some reason it is allowed to remove numpy and the following command works: conda remove numpy. I am skipping the output.

Yet once I removed the package, possibly by mistake, and want to add it back I encounter a problem:. So this is funny, since I can mess up my system in a way I cannot repair. Something does not make sense.

This is a pretty complex system, so I understand there are some issue here. Yet the logic should be that the user will be able to recover from mistakes as much as possible. This seems reasonable, and not doing so was an oversight. It would be a simple change but at this point I think my preference is to wait for a conda point release in the near future. I doubt that many people will remove numpy only a conjecture, but it has not come up yet in any support issues and if someone does we can have them fix the situation with the "conda env --activate" advanced command.

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It only takes a minute to sign up. According to the output of dpkg -Snumpy has been installed using apt to remove it run:. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Unable to uninstall programs using sudo pip Ask Question. Asked 2 years, 10 months ago.

Active 2 years, 10 months ago. Viewed 25k times. Active Oldest Votes. According to the output of dpkg -Snumpy has been installed using apt to remove it run: sudo apt remove python-numpy you might have a local installation of it using pipto remve that you can use: pip uninstall numpy --user.

Ravexina Ravexina Wouldn't pip remove numpy --user make a clash with pip of miniconda2?

As far as I know, no I uninstalled it using sudo apthowever when I run sudo pip list I still get numpy in the list. Now try removing it using sudo pip remove numpyit should work now. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.

Featured on Meta.To delete multiple elements from a numpy array by index positions, pass the numpy array and list of index positions to be deleted to np. To delete a column from a 2D numpy array using np. To delete a row from a 2D numpy array using np. It returns the flattened copy of 2D numpy array after deleting element. We passed 2 because in flattened 2d matrix we gor the number from row and column position i.

We have created a function to do this calculation and delete element from 2D numpy array by row and column position i. Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. Delete elements, rows or columns from a Numpy Array by index positions using numpy.

Create a Numpy array from list of numbers. Delete element at index position 2. Modified Numpy Array by deleting element at index position 2 [ 4 5 7 8 9 10 11]. Modified Numpy Array by deleting element at index position 2.

Delete element at index positions 1,2 and 3. Create a 2D numpy array from list of list. Delete column at index 1. Modified 2D Numpy Array by removing columns at index 1 [[11 13 11] [21 23 24] [31 33 34]]. Modified 2D Numpy Array by removing columns at index 1. Delete row at index 0 i. Delete element in row 0 and column 2 from 2D numpy array.

Delete element in row 1 and column 1 from 2D numpy array. Modified 2D Numpy Array by removing rows at index 0. Origibal 2D Numpy Array. How to get Numpy Array Dimensions using numpy. Modified 2D Numpy Array by removing columns at index 1 [ [ 11 13 11 ] [ 21 23 24 ] [ 31 33 34 ] ].Using the NumPy function np. Specify the axis dimension and position row number, column number, etc.

It is also possible to select multiple rows and columns using a slice or a list. If you want to delete elements, rows and columns according to the condition instead of specifying the position, refer to the following post. Details will be described later. The original ndarray is not changed, and a new copy of ndarray is returned. Specify the index row number or column number to be deleted in the second parameter obj. Index starts at 0.

Specify the axis dimension to be deleted in the third parameter axis. Axis number starts from 0. The default for axis is None. Multiple rows and columns can be deleted at once by specifying a list or a slice in the second parameter obj. It is also possible to specify multiple rows and columns by using a slice specifying a range with [start:stop:step].

For more information about the basics of slicing and slice objects with slicesee the following post:. Create a slice object with slice and specify it as the second parameter obj. It is equivalent to [:stop] if there is only one argument, [start:stop] if there are two, and [start:stop:step] if there are three. If you want to omit, specify None explicitly. You can not delete multiple dimensions such as rows and columns at once with np.

If you want to delete different dimensions, repeat np. So far, for the sake of convenience, it has been described in terms of row and column, but the concept is the same in the case of three or more dimensions. Top Python NumPy numpy. Here, the following contents will be described. Basic usage of np. Related post: NumPy: Extract or delete elements, rows and columns that satisfy the conditions Basic usage of np.

Python NumPy. DataFrame, Series and numpy.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Already on GitHub? Sign in to your account. I'm running Anaconda At the end, installing it with pip instead of conda look to have work but when I tried to install matplotlib with conda with pip it didn't work the problem with numpy came back. Importing the numpy c-extensions failed.

You should probably use the conda version. Also since you are using pycharm, did you ensure that your conda environment is actived, IIRC that is a common mistake? This is an issue with your anaconda, and specifically you seems to be using the intel version which gives an additional warning here likely unrelated.

I suggest you look for old issues of others using PyCharm, you may find something there, maybe someone here knows quickly as well, but I do not and it is not a NumPy issue as such. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Labels 33 - Question 57 - Close? Copy link Quote reply. Try uninstalling and reinstalling numpy. If you have already done that, then: Check that you expected to use Python3.

Please include details on: how you installed Python how you installed numpy your operating system whether or not you have multiple versions of Python installed if you built from source, your compiler versions and ideally a build log If you're working with a numpy git repository, try git clean -xdf removes all files not under version control and rebuild numpy.

Note: this error has many possible causes, so please don't comment on an existing issue about this - open a new one instead. This comment has been minimized. Sign in to view. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Phone: Fax: Search everywhere only in this topic.

Advanced Search. Classic List Threaded. Hi list This is a general python question but I will ask it here. To install a new numpy on Debian testing I remove installed version with "aptitude purge python-numpy" download numpy source code and install numpy with "sudo python setup. If I want to remove the installed numpy how do I proceed?

Scott Sinclair Re: how to uninstall numpy. Assuming your system Python is 2. John Mark Agosta. In reply to this post by aclark. Here's a good article on the vagaries of python paths when installing a new python. Thus you can check exactly how python finds its modules, to assure the new install is working properly:. In reply to this post by x. Thanks to everybody. Search everywhere only in this topic Advanced Search how to uninstall numpy.

Unfortunately that won't work in this case.

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If pip wasn't used to install the package it has no way know what's been installed. In reply to this post by aclark Here's a good article on the vagaries of python paths when installing a new python. Free forum by Nabble.

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