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    Thanks for comments, I've fixed the named issues.<br>
    <br>
    Code is python2&3 compatible, I aliased numpy and used better
    inversion.<br>
    Specially thanks for pointing at histogram equalization - I've added
    example for images.<br>
    Probably some other 'visual' examples would help - I'll try to
    invent something to other points, but this is not simple.<br>
    <br>
    (I left %matplolib inline due to more appropriate rendering)<br>
    <br>
    Alex.<br>
    <br>
    <div class="moz-cite-prefix">02.10.15 10:50, Kiko пишет:<br>
    </div>
    <blockquote
cite="mid:CAB-sx61=C+D-P1Z7J7hkHjOGiFgsKYSed0MX4x8GBqEuaPvJ2w@mail.gmail.com"
      type="cite">
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          <div class="gmail_quote">2015-10-02 9:48 GMT+02:00 Kiko <span
              dir="ltr"><<a moz-do-not-send="true"
                href="mailto:kikocorreoso@gmail.com" target="_blank">kikocorreoso@gmail.com</a>></span>:<br>
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                  <div class="gmail_quote"><span class="">2015-10-02
                      9:38 GMT+02:00 Alex Rogozhnikov <span dir="ltr"><<a
                          moz-do-not-send="true"
                          href="mailto:alex.rogozhnikov@yandex.ru"
                          target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:alex.rogozhnikov@yandex.ru">alex.rogozhnikov@yandex.ru</a></a>></span>:<br>
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                            I would suggest<br>
                            <br>
                            %matplotlib notebook<br>
                            <br>
                          </span><span>
                            It will still have to a nice png, but you
                            get an interactive figure when it is live.<br>
                          </span></blockquote>
                        <br>
                        Amazing, thanks. I was using mpld3 for this.<br>
                        (for some strange reason I need to put
                        %matplotlib notebook before each plot)<span><br>
                        </span></blockquote>
                      <div><br>
                      </div>
                    </span>
                    <div>You should create a figure before each plot
                      instead of putthon %matplotlib notebook<br>
                    </div>
                    <div>plt.figure()<br>
                      ....<br>
                    </div>
                  </div>
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            <div>putthon == putting<br>
            </div>
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                          <br>
                          <blockquote class="gmail_quote"
                            style="margin:0 0 0 .8ex;border-left:1px
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                            The recommendation of inverting a
                            permutation by argsort'ing it, while it
                            works, is suboptimal, as it takes O(n
                            log(n)) time, and you can do it in linear
                            time:<br>
                          </blockquote>
                        </span>
                        Actually, there is (later in post) a linear
                        solution using bincount, but your code is
                        definitely better. Thanks!
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