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| Keywords: Conic x^2+2xy+y^2−8x=0.svg en Graph of the conic <math>x 2+2xy+y 2-8x 0</math> it Grafico della conica <math>x 2+2xy+y 2-8x 0</math> 2011-09-01 own Krishnavedala Graph of conic <math>4xy+3y 2+2x+4y 0</math> validSVG Python Script Requirements python-2 6 with numpy and matplotlib-1 0 1 <syntaxhighlight lang python > from matplotlib pyplot import from numpy import from mpl_toolkits axes_grid axislines import SubplotZero X linspace 0 10 25 Y linspace -5 5 25 x y meshgrid X Y fig figure figsize 10 6 ax SubplotZero fig 111 fig add_subplot ax for direction in xzero yzero ax axisdirection set_visible True ax axisdirection set_axisline_style -> for direction in top bottom left right ax axisdirection set_visible False ax axis yzero set_axis_direction left ax grid True ax minorticks_on ax contour x y x 2 + 2 x y +y 2 - 8 x 0 linewidths 1 5 colors 'r' ax text 1 75 -4 5 r' x 2+2xy+y 2-8x 0 ' color 'r' ax arrow 5 -1 0 5 color 'orange' head_width 1 head_length 2 ax text 75 4 r' \bar y ' color 'orange' ax arrow -2 5 1 5 5 5 0 color 'orange' head_width 1 head_length 2 ax text 3 1 r' \bar x ' color 'orange' ax plot 5 1 5 'ko' ax text 25 1 75 r'V' ax arrow -4 5 -4 5 9 9 color 'm' ls 'dashed' lw 5 ax text -4 -4 r' x y ' color 'm' ax arrow -5 5 -4 5 9 9 color 'grey' ls 'dashed' lw 5 ax text -6 -3 r' x y-1 ' color 'grey' ax arrow -2 -1 5 5 color 'g' head_width 2 head_length 2 ax text 2 9 4 2 r' y ' color 'g' ax arrow -4 5 4 5 9 -9 color 'c' ls 'dashed' lw 5 ax text -4 4 r' x -y ' color 'c' ax arrow -2 5 4 5 9 -9 color 'b' ls 'dashed' lw 5 ax text -2 4 r' x y+2 ' color 'b' ax arrow -1 3 4 -4 color 'g' head_width 2 head_length 2 ax text 2 5 -1 r' x ' color 'g' ax plot 0 1 2 0 1 2 'ko' ax text 1 1 r'A' ax text 1 1 1 r'M' ax text 1 9 2 1 r'B' ax text 10 1 x ax text 1 5 y xticks arange -6 11 1 yticks arange -5 6 1 ax set_ylim -5 5 ax set_xlim -6 10 fig savefig Test svg bbox_inches tight \ pad_inches 15 </syntaxhighlight> cc-zero Uploaded_with_UploadWizard Conic_sections Images with Python source code Created with Matplotlib | ||||
