How do I plot list of tuples in Python

Question

I have the following data set   I would like to use Python or Gnuplot to plot the data   The tuples are of the form  x  y    The Y-axis should be a log axis  that is  log y    A scatter plot or line plot would be ideal   How can this be done      0  6 0705199999997801e-08    1  2 1015700100300739e-08      2  7 6280656623374823e-09    3  5 7348209304555086e-09      4  3 6812203579604238e-09    5  4 1572516753310418e-09

User · Answer

With gnuplot using gplot py  from gplot import    l     0  6 0705199999997801e-08    1  2 1015700100300739e-08      2  7 6280656623374823e-09    3  5 7348209304555086e-09      4  3 6812203579604238e-09    5  4 1572516753310418e-09    gplot log  y   gplot  zip  l

User · Answer

If I get your question correctly  you could do something like this    gt  gt  gt  import matplotlib pyplot as plt  gt  gt  gt  testList    0  6 0705199999997801e-08    1  2 1015700100300739e-08      2  7 6280656623374823e-09    3  5 7348209304555086e-09      4  3 6812203579604238e-09    5  4 1572516753310418e-09    gt  gt  gt  from math import log  gt  gt  gt  testList2     elem1  log elem2   for elem1  elem2 in testList   gt  gt  gt  testList2   0  -16 617236475334405    1  -17 67799605473062    2  -18 691431541177973    3  -18 9767093108359    4  -19 420021520728017    5  -19 298411635970396    gt  gt  gt  zip  testList2    0  1  2  3  4  5    -16 617236475334405  -17 67799605473062  -18 691431541177973  -18 9767093108359  -19 420021520728017  -19 298411635970396    gt  gt  gt  plt scatter  zip  testList2    gt  gt  gt  plt show     which would give you something like    Or as a line plot    gt  gt  gt  plt plot  zip  testList2    gt  gt  gt  plt show       EDIT - If you want to add a title and labels for the axis  you could do something like   gt  gt  gt  plt scatter  zip  testList2    gt  gt  gt  plt title  Random Figure    gt  gt  gt  plt xlabel  X-Axis    gt  gt  gt  plt ylabel  Y-Axis    gt  gt  gt  plt show     which would give you

User · Answer

As others have answered  scatter   or plot   will generate the plot you want  I suggest two refinements to answers that are already here    Use numpy to create the x-coordinate list and y-coordinate list  Working with large data sets is faster in numpy than using the iteration in Python suggested in other answers  Use pyplot to apply the logarithmic scale rather than operating directly on the data  unless you actually want to have the logs   import matplotlib pyplot as plt import numpy as np  data     2  10    3  100    4  1000    5  100000   data in array   np array data      That looks like array        2      10                                3     100                                4    1000                                5  100000         transposed   data in array T     That looks like array        2       3       4       5                               10     100    1000  100000             x  y   transposed     Here is the OO method   You could also the state-based methods of pyplot fig  ax   plt subplots 1 1    gets a handle for the AxesSubplot object ax plot x  y   ro   ax plot x  y   b-   ax set yscale  log   fig show        I ve also used ax set xlim 1  6  and ax set ylim  1  1e6  to make it pretty   I ve used the object-oriented interface to matplotlib  Because it offers greater flexibility and explicit clarity by using names of the objects created  the OO interface is preferred over the interactive state-based interface

User · Answer

In matplotlib it would be   import matplotlib pyplot as plt  data      0  6 0705199999997801e-08    1  2 1015700100300739e-08     2  7 6280656623374823e-09    3  5 7348209304555086e-09     4  3 6812203579604238e-09    5  4 1572516753310418e-09    x val    x 0  for x in data  y val    x 1  for x in data   print x val plt plot x val y val  plt plot x val y val  or   plt show     which would produce

User · Answer

You could also use zip  import matplotlib pyplot as plt  l     0  6 0705199999997801e-08    1  2 1015700100300739e-08         2  7 6280656623374823e-09    3  5 7348209304555086e-09         4  3 6812203579604238e-09    5  4 1572516753310418e-09    x  y   zip  l   plt plot x  y

[python] How do I plot list of tuples in Python?

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