I have created a virtualenv with Python3. I also installed matplotlib on the system. So when I try to use it outside the virtualenv, the system finds the installation. When I do pip list matplotlib shows as one of the packages. However when I activate my virtualenv it doesn't show it under python3. I tried removing and re-creating the virtualenv and it doesn't work. I also tried installing matplotlib pip install matplotlib under the virtualenv and again not working.
Any recommendation how to fix the issue? 
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        Amir
        
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                    What does pip freeze show? – supra28 Jun 01 '18 at 17:16
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                    1The answer to this question should help: https://stackoverflow.com/questions/12079607/make-virtualenv-inherit-specific-packages-from-your-global-site-packages – Davis Yoshida Jun 01 '18 at 17:16
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                    pip freeze shows all the modules installed when not on virtualenv. When on virtualenv it shows nothing. – Amir Jun 01 '18 at 17:56
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                    Thanks a lot guys. I found the solution in the other post to be working out. So marked my question as duplicate. – Amir Jun 05 '18 at 01:19