strings as xdata

Fixes #241.

Author: nschloe

.circleci/config.yml

@@ -20,6 +20,7 @@ jobs:
       # <https://stackoverflow.com/a/44333806/353337>
       - run: DEBIAN_FRONTEND=noninteractive apt install tzdata
       - run: apt install -y texlive-latex-base texlive-latex-extra python3-pip python3-tk python3-scipy
+      - run: pip3 install -r test_requirements.txt
       - run: pip3 install -U pytest pytest-cov excode
       - checkout
       - run: cd ~/work

matplotlib2tikz/line2d.py

@@ -2,10 +2,12 @@
 #
 from __future__ import print_function
 
-from matplotlib.dates import num2date
 import datetime
 import six
 
+from matplotlib.dates import num2date
+import numpy
+
 from . import color as mycol
 from . import path as mypath
 from . import files
@@ -242,8 +244,23 @@ def _marker(
 
 
 def _table(obj, data):
-    xdata, ydata = obj.get_data()
-    if not isinstance(xdata[0], datetime.datetime):
+    # get_xydata() always gives float data, no matter what
+    xdata, ydata = obj.get_xydata().T
+
+    # get_{x,y}data gives datetime or string objects if so specified in the plotter
+    xdata_alt = obj.get_xdata()
+
+    ff = data["float format"]
+
+    if isinstance(xdata_alt[0], datetime.datetime):
+        xdata = xdata_alt
+    elif isinstance(xdata_alt[0], str):
+        data["current axes"].axis_options += [
+            "xtick={{{}}}".format(",".join([ff.format(x) for x in xdata])),
+            "xticklabels={{{}}}".format(",".join(xdata_alt))
+        ]
+        xdata, ydata = transform_to_data_coordinates(obj, xdata, ydata)
+    else:
         xdata, ydata = transform_to_data_coordinates(obj, xdata, ydata)
 
     # matplotlib allows plotting of data containing `astropy.units`, but they will break
@@ -258,15 +275,18 @@ def _table(obj, data):
         pass
 
     try:
-        has_mask = ydata.mask.any()
+        _, ydata_alt = obj.get_data()
+        ydata_mask = ydata_alt.mask
     except AttributeError:
-        has_mask = False
+        ydata_mask = []
+    else:
+        if isinstance(ydata_mask, numpy.bool_) and not ydata_mask:
+            ydata_mask = []
 
     axis_options = []
 
     content = []
 
-    ff = data["float format"]
     if isinstance(xdata[0], datetime.datetime):
         xdata = [date.strftime("%Y-%m-%d %H:%M") for date in xdata]
         xformat = "{}"
@@ -293,13 +313,13 @@ def _table(obj, data):
         content.append("table {%\n")
 
     plot_table = []
-    if has_mask:
+    if any(ydata_mask):
         # matplotlib jumps at masked images, while PGFPlots by default interpolates.
         # Hence, if we have a masked plot, make sure that PGFPlots jumps as well.
         if "unbounded coords=jump" not in data["current axes"].axis_options:
             data["current axes"].axis_options.append("unbounded coords=jump")
 
-        for (x, y, is_masked) in zip(xdata, ydata, ydata.mask):
+        for (x, y, is_masked) in zip(xdata, ydata, ydata_mask):
             if is_masked:
                 plot_table.append((xformat + col_sep + "nan\n").format(x))
             else:

test/test_pandas_dataframe.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+#
+import matplotlib.pyplot as plt
+import pandas as pd
+
+from helpers import assert_equality
+
+
+def plot():
+    fig = plt.figure(1, figsize=(8, 5))
+    df = pd.DataFrame(index=['one', 'two', 'three'], data={'data': [1, 2, 3]})
+    plt.plot(df, 'o')
+    return fig
+
+
+def test():
+    assert_equality(plot, __file__[:-3] + "_reference.tex")
+    return
+
+
+if __name__ == "__main__":
+    import helpers
+
+    helpers.compare_mpl_latex(plot)
+    # helpers.print_tree(plot())

test/test_pandas_dataframe_reference.tex

@@ -0,0 +1,23 @@
+\begin{tikzpicture}
+
+\definecolor{color0}{rgb}{0.12156862745098,0.466666666666667,0.705882352941177}
+
+\begin{axis}[
+tick align=outside,
+tick pos=left,
+x grid style={white!69.01960784313725!black},
+xmin=-0.1, xmax=2.1,
+xtick={0,1,2},
+xticklabels={one,two,three},
+y grid style={white!69.01960784313725!black},
+ymin=0.9, ymax=3.1
+]
+\addplot [semithick, color0, mark=*, mark size=3, mark options={solid}, only marks]
+table {%
+0 1
+1 2
+2 3
+};
+\end{axis}
+
+\end{tikzpicture}