CODEWITHSUNDEEP
pythonmatplotlibplot
Vaiaro
Vaiaro

Reputation: 1028

Positive signed tick labels in matplotlib

How is it possible to get a positive +-sign in front of the y tick labels in a matplotlib subplot? enter image description here

Upvotes: 1

Views: 714

Answers (2)

gboffi
gboffi

Reputation: 25093

Quick and dirty (I'd say that methods' names are self-explanatory, aren't they?)

ax = plt.gca()
ylabels = ax.get_ylabels()
for ylabel in ylabels: ylabel.set_text('+'+ylabel.get_text()) 
ax.set_ylabels(ylabels)

A little more kosher

import matplotlib.ticker as ticker
...
fig, ax = plt.subplots()
ax.yaxis.set_major_formatter(ticker.FormatStrFormatter("%+g"))
plt.plot(...)
...

The second part has been written using https://matplotlib.org/gallery/ticks_and_spines/tick-formatters.html as a reference.

Addendum

In a comment the OP asked "… what can I do to avoid a +-sign in front of the 0?".

A possible solution can be

...
bare0 = lambda y, pos: ('%+g' if y>0 else '%g')%y
ax.yaxis.set_major_formatter(ticker.FuncFormatter(bare0))
...

See https://matplotlib.org/api/ticker_api.html#matplotlib.ticker.FuncFormatter for the details.

Upvotes: 4

zhavorsa
zhavorsa

Reputation: 394

Maybe like this ?

plt.yticks(np.arange(6), ('0', '+1', '+2', '+3', '+4', '+5'))

Upvotes: -1

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