204 lines
12 KiB
Python
204 lines
12 KiB
Python
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from sympy.core.singleton import S
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from sympy.core.symbol import Symbol
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from sympy.functions.elementary.exponential import log
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from sympy.functions.elementary.miscellaneous import sqrt
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from sympy.functions.elementary.trigonometric import sin
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from sympy.plotting.textplot import textplot_str
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from sympy.utilities.exceptions import ignore_warnings
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def test_axes_alignment():
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x = Symbol('x')
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lines = [
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' 1 | ..',
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' | ... ',
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' | .. ',
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' | ... ',
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' | ... ',
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' | .. ',
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' | ... ',
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' | ... ',
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' | .. ',
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' | ... ',
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' 0 |--------------------------...--------------------------',
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' | ... ',
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' | .. ',
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' | ... ',
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' | ... ',
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' | .. ',
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' | ... ',
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' | ... ',
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' | .. ',
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' | ... ',
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' -1 |_______________________________________________________',
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' -1 0 1'
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]
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assert lines == list(textplot_str(x, -1, 1))
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lines = [
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' 1 | ..',
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' | .... ',
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' | ... ',
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' | ... ',
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' | .... ',
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' | ... ',
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' | ... ',
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' | .... ',
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' 0 |--------------------------...--------------------------',
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' | .... ',
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' | ... ',
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' | ... ',
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' | .... ',
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' | ... ',
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' | ... ',
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' | .... ',
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' -1 |_______________________________________________________',
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' -1 0 1'
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]
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assert lines == list(textplot_str(x, -1, 1, H=17))
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def test_singularity():
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x = Symbol('x')
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lines = [
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' 54 | . ',
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' | ',
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' | ',
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' | ',
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' | ',' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' 27.5 |--.----------------------------------------------------',
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' | ',
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' | ',
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' | ',
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' | . ',
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' | \\ ',
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' | \\ ',
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' | .. ',
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' | ... ',
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' | ............. ',
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' 1 |_______________________________________________________',
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' 0 0.5 1'
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]
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assert lines == list(textplot_str(1/x, 0, 1))
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lines = [
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' 0 | ......',
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' | ........ ',
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' | ........ ',
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' | ...... ',
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' | ..... ',
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' | .... ',
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' | ... ',
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' | .. ',
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' | ... ',
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' | / ',
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' -2 |-------..----------------------------------------------',
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' | / ',
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' | / ',
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' | / ',
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' | . ',
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' | ',
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' | . ',
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' | ',
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' | ',
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' | ',
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' -4 |_______________________________________________________',
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' 0 0.5 1'
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]
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# RuntimeWarning: divide by zero encountered in log
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with ignore_warnings(RuntimeWarning):
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assert lines == list(textplot_str(log(x), 0, 1))
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def test_sinc():
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x = Symbol('x')
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lines = [
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' 1 | . . ',
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' | . . ',
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' | ',
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' | . . ',
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' | ',
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' | . . ',
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' | ',
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' | ',
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' | . . ',
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' | ',
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' 0.4 |-------------------------------------------------------',
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' | . . ',
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' | ',
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' | . . ',
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' | ',
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' | ..... ..... ',
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' | .. \\ . . / .. ',
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' | / \\ / \\ ',
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' |/ \\ . . / \\',
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' | \\ / \\ / ',
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' -0.2 |_______________________________________________________',
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' -10 0 10'
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]
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# RuntimeWarning: invalid value encountered in double_scalars
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with ignore_warnings(RuntimeWarning):
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assert lines == list(textplot_str(sin(x)/x, -10, 10))
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def test_imaginary():
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x = Symbol('x')
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lines = [
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' 1 | ..',
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' | .. ',
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' | ... ',
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' | .. ',
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' | .. ',
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' | .. ',
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' | .. ',
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' | .. ',
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' | .. ',
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' | / ',
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' 0.5 |----------------------------------/--------------------',
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' | .. ',
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' | / ',
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' | . ',
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' | ',
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' | . ',
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' | . ',
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' | ',
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' | ',
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' | ',
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' 0 |_______________________________________________________',
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' -1 0 1'
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]
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# RuntimeWarning: invalid value encountered in sqrt
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with ignore_warnings(RuntimeWarning):
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assert list(textplot_str(sqrt(x), -1, 1)) == lines
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lines = [
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' 1 | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' 0 |-------------------------------------------------------',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' | ',
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' -1 |_______________________________________________________',
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' -1 0 1'
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]
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assert list(textplot_str(S.ImaginaryUnit, -1, 1)) == lines
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