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Strange Error Message when Plotting with a LaTeX Legend

asked 2020-07-01 01:28:17 +0200

Gregory Bard gravatar image

updated 2020-07-01 01:29:45 +0200

The following code is from the 1st edition of my textbook, Sage for Undergraduates. It is producing some extremely unexpected errors (technically, deprication warnings). Something about an invalid escape sequence, \i, which I'm not using.

Can someone explain how I should change my code, so that these warnings do not appear?


P1= text('$\int_0^2 \sqrt{x} \, dx$', (0.5, 1.1), fontsize=20)

P2= plot( sqrt(x), 0, 2, fill=True)

P= P1 + P2

Warning: <input>:1: DeprecationWarning: invalid escape sequence \i

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answered 2020-07-01 02:26:37 +0200

Juanjo gravatar image

The problem comes from the first line. It should be:

P1= text(r'$\int_0^2 \sqrt{x} \, dx$', (0.5, 1.1), fontsize=20)

Please, note the r (which means raw) before the string. It is needed to force Python to interpret \ as an ordinary character instead of an escape one.

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Asked: 2020-07-01 01:28:17 +0200

Seen: 380 times

Last updated: Jul 01 '20