multiple plot in one figure in Python

Question

I am new to python and am trying to plot multiple lines in the same figure using matplotlib  Value of my Y axis is stored in a dictionary and I make corresponding values in X axis in my following code  My code is like this    for i in range len ID    AxisY  PlotPoints ID i   if len AxisY  gt  5      AxisX   len AxisY       for i in range 1 len AxisY            AxisX append AxisX i-1 -1      plt plot AxisX AxisY      plt xlabel  Lead Time  in days        plt ylabel  Proportation of Events Scheduled       ax   plt gca       ax invert xaxis       ax yaxis tick right       ax yaxis set label position  right       plt show     But I am getting separate figures with single plot one by one  Can anybody help me figure our what is wrong with my code  Why can t I produce multiple line plotting  Thanks a lot

User · Answer

Since I don t have a high enough reputation to comment I ll answer liang question on Feb 20 at 10 01 as an answer to the original question   In order for the for the line labels to show you need to add plt legend to your code  to build on the previous example above that also includes title  ylabel and xlabel   import matplotlib pyplot as plt  plt plot  lt X AXIS VALUES HERE gt    lt Y AXIS VALUES HERE gt    line type   label  label here   plt plot  lt X AXIS VALUES HERE gt    lt Y AXIS VALUES HERE gt    line type   label  label here   plt title  title   plt ylabel  ylabel   plt xlabel  xlabel   plt legend   plt show

User · Answer

The OP states that each plot element overwrites the previous one rather than being combined into a single plot  This can happen even with one of the many suggestions made by other answers  If you select several lines and run them together  say   plt plot  lt X gt    lt Y gt   plt plot  lt X gt    lt Z gt     the plot elements will typically be rendered together  one layer on top of the other  But if you execute the code line-by-line  each plot will overwrite the previous one    This perhaps is what happened to the OP  It just happened to me  I had set up a new key binding to execute code by a single key press  on spyder   but my key binding was executing only the current line  The solution was to select lines by whole blocks or to run the whole file

User · Answer

EDIT  I just realised after reading your question again  that i did not answer your question  You want to enter multiple lines in the same plot  However  I ll leave it be  because this served me very well multiple times  I hope you find usefull someday I found this a while back when learning python import matplotlib pyplot as plt import matplotlib gridspec as gridspec  fig   plt figure      create figure window  gs   gridspec GridSpec a  b    Creates grid  gs  of a rows and b columns    ax   plt subplot gs x  y     Adds subplot  ax  in grid  gs  at position  x y    ax set ylabel  Foo    Add y-axis label  Foo  to graph  ax   xlabel for x-axis    fig add subplot ax   add  ax  to figure  you can make different sizes in one figure as well  use slices in that case   gs   gridspec GridSpec 3  3   ax1   plt subplot gs 0       row 0  top  spans all 3  columns  consult the docs for more help and examples  This little bit i typed up for myself once  and is very much based copied from the docs as well  Hope it helps    I remember it being a pain in the     to get acquainted with the slice notation for the different sized plots in one figure  After that i think it s very simple

User · Answer

This is very simple to do   import matplotlib pyplot as plt  plt plot  lt X AXIS VALUES HERE gt    lt Y AXIS VALUES HERE gt    line type   label  label here   plt plot  lt X AXIS VALUES HERE gt    lt Y AXIS VALUES HERE gt    line type   label  label here   plt legend loc  best   plt show     You can keep adding plt plot as many times as you like  As for line type  you need to first specify the color  So for blue  it s b   And for a normal line it s -   An example would be   plt plot total lengths  sort times heap   b-   label  Heap

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