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--- other:python:matplotlib_by_jyp [2021/02/26 12:56] – More link updates jypeter
+++ other:python:matplotlib_by_jyp [2021/05/11 17:12] – [Useful matplotlib reference pages] added tick formatters jypeter
@@ Line 124: / Line 124: @@
         * [[https://stackoverflow.com/questions/35479508/cartopy-set-xlabel-set-ylabel-not-ticklabels|Trick source]]
         * Trick needs to be used with ''cartopy 0.17.0''\\ Remember to update/remove this information in the future
-    * Major (and minor) **tick marks location**: ''my_plot.set_xticks(x_ticks_values, minor=False)''
+    * Major (and minor) **tick marks location**: ''my_plot.set_xticks(x_ticks_values, minor=False)'' ([[https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.set_xticks.html|set_xticks]])
       * Use an empty list if you don't want tick marks: ''my_plot.set_xticks([])''
-    * **Tick labels** (if you don't want the default values): ''my_plot.set_xticklabels(x_ticks_labels, minor=False, fontsize=ticklabels_fontsize)''
+    * **Tick labels**: ''my_plot.set_xticklabels(x_tick_labels, minor=False, fontsize=ticklabels_fontsize)'' ([[https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.set_xticklabels.html|set_xticklabels]])
-      * ''x_ticks_labels'' is a list of strings that has the same length as ''x_ticks_values''. Use an empty string in the positions where you don't want a label
+      * If you do not specify labels, the //default labels// will just be the values specifying the ticks' location
+      * ''x_tick_labels'' is a list of strings that has the same length as ''x_ticks_values''.\\ Use an empty string in the positions where you don't want a label
+      * The default numerical labels may be too long, due to numerical approximations. You can try to explicitly round the values, or generate correct label strings from the values\\ <code>>>> x_tick_values = np.arange(0, 1, 0.2)
+>>> x_tick_values.tolist()
+[0.0, 0.2, 0.4, 0.6000000000000001, 0.8]
+>>> x_tick_values.round(decimals=1).tolist()
+[0.0, 0.2, 0.4, 0.6, 0.8]
+>>> x_tick_labels = [ '%.1f' % (t_val,) for t_val in x_tick_values ]
+>>> x_tick_labels
+['0.0', '0.2', '0.4', '0.6', '0.8']
+>>> x_tick_labels[0] = 'START'
+>>> x_tick_labels[-1] = 'END'
+>>> x_tick_labels
+['START', '0.2', '0.4', '0.6', 'END']
+</code>
+      * You can also use fancy [[https://matplotlib.org/stable/gallery/ticks_and_spines/tick-formatters.html|tick formatters]]
       * Many more options for ticks, labels, orientation, ...
     * **Grid lines**: