[Tutor] Fwd: Re: Fwd: Re: Created map after opening file

[Alan Gauld]

Forwarding to list

-------- Forwarded Message --------



I can now see my data.

Current view: https://s15.postimg.org/ni570gxl7/pyscreenshot2.png

Yes, you are correct on how the points are going to be plotted. My
question is, how do you plot only rows on python?
I found an example online, but the data is in columns.
(http://www.ast.uct.ac.za/~sarblyth/pythonGuide/PythonPlottingBeginnersGuide.pdf,
pg. 14).

How do I change this particular part on the example so it reads the
rows: pl.plot(data[:,0], data[:,1], ’ro’):: Or will this not work in
this case? I was thinking of making two arrays like this: x=np.array []
and y=np.array[] and the inserting the data between the brackets, but
then though wouldn't that defeat the purpose of the file?


On Thu, Oct 20, 2016 at 12:45 PM, Alan Gauld <alan.gauld at alan-g.me.uk
<mailto:alan.gauld at alan-g.me.uk>> wrote:

    Resending after mail error, apologies if you get two!

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    Always use Reply All (Or Reply List) to reply to the tutor list...

    On 20/10/16 14:45, Betty Cruz wrote:
    > I had actually attached the map and how the data looked. I guess the
    > pictures didn't go through? I have added links.
    >

    The server often strips attachments, it's always better to
    include as text or provide a link if it's big.


    >
    > The data looks like this:
    > 10000 10000 10000 7367   7367   7367
    > 10000 29410 29410 29410 29410 36101

    So the points you want to plot are:

    (10000,10000), (10000,294210),(10000,29410)(again?), (7367,29410)...

    correct?

    > https://i.stack.imgur.com/tUvBj.png
    <https://i.stack.imgur.com/tUvBj.png>
    >
    > I have tried printing it out, but I just get this error: No such file
    > or directory: 'map.dat'

    Have you tried using the full path?

    eg:
    data = np.loadtxt(r'C:/myfolder/map.dat')

    Python is looking in the current working directory
    for the file and not finding it.

    > I added print (data) after data = np.loadtxt('map.dat'), but that
    > didn't work.

    Yes, that will only work once you get the file path sorted out.


    --
    Alan G
    Author of the Learn to Program web site
    http://www.alan-g.me.uk/
    http://www.amazon.com/author/alan_gauld
    <http://www.amazon.com/author/alan_gauld>
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    http://www.flickr.com/photos/alangauldphotos
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