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DOC: Move "Infinite lines" example from section "pyplot" to "Lines, bars and markers"

Let's reduce the section "pyplot" to examples explicitly showcasing special approaches and features of `pyplot`. An example mainly explaining how to draw infinite lines should be in the "lines" subsection.

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galleries/examples/lines_bars_and_markers
- axline.py

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`‎galleries/examples/pyplots/axline.pyrenamed to‎galleries/examples/lines_bars_and_markers/axline.py`

Lines changed: 17 additions & 13 deletions

Original file line number	Diff line number	Diff line change
`@@ -9,6 +9,8 @@`
`9`	`9`	`sigmoid function.`
`10`	`10`
`11`	`11`	`~.axes.Axes.axline` draws infinite straight lines in arbitrary directions.
	`12`	`+`
	`13`	`+.. redirect-from:: /gallery/pyplot/axline`
`12`	`14`	`"""`
`13`	`15`
`14`	`16`	`importmatplotlib.pyplotasplt`
`@@ -17,28 +19,28 @@`
`17`	`19`	`t=np.linspace(-10,10,100)`
`18`	`20`	`sig=1/ (1+np.exp(-t))`
`19`	`21`
`20`		`-plt.axhline(y=0,color="black",linestyle="--")`
`21`		`-plt.axhline(y=0.5,color="black",linestyle=":")`
`22`		`-plt.axhline(y=1.0,color="black",linestyle="--")`
`23`		`-plt.axvline(color="grey")`
`24`		`-plt.axline((0,0.5),slope=0.25,color="black",linestyle=(0, (5,5)))`
`25`		`-plt.plot(t,sig,linewidth=2,label=r"$\sigma(t) = \frac{1}{1 + e^{-t}}$")`
`26`		`-plt.xlim(-10,10)`
`27`		`-plt.xlabel("t")`
`28`		`-plt.legend(fontsize=14)`
	`22`	`+fig,ax=plt.subplots()`
	`23`	`+ax.axhline(y=0,color="black",linestyle="--")`
	`24`	`+ax.axhline(y=0.5,color="black",linestyle=":")`
	`25`	`+ax.axhline(y=1.0,color="black",linestyle="--")`
	`26`	`+ax.axvline(color="grey")`
	`27`	`+ax.axline((0,0.5),slope=0.25,color="black",linestyle=(0, (5,5)))`
	`28`	`+ax.plot(t,sig,linewidth=2,label=r"$\sigma(t) = \frac{1}{1 + e^{-t}}$")`
	`29`	`+ax.set(xlim=(-10,10),xlabel="t")`
	`30`	`+ax.legend(fontsize=14)`
`29`	`31`	`plt.show()`
`30`	`32`
`31`	`33`	`# %%`
`32`		-# `~.axes.Axes.axline` can also be used with a``transform`` parameter, which
	`34`	+# `~.axes.Axes.axline` can also be used with atransform parameter, which
`33`	`35`	`# applies to the point, but not to the slope. This can be useful for drawing`
`34`	`36`	`# diagonal grid lines with a fixed slope, which stay in place when the`
`35`	`37`	`# plot limits are moved.`
`36`	`38`
	`39`	`+fig,ax=plt.subplots()`
`37`	`40`	`forposinnp.linspace(-2,1,10):`
`38`		`-plt.axline((pos,0),slope=0.5,color='k',transform=plt.gca().transAxes)`
	`41`	`+ax.axline((pos,0),slope=0.5,color='k',transform=ax.transAxes)`
`39`	`42`
`40`		`-plt.ylim([0,1])`
`41`		`-plt.xlim([0,1])`
	`43`	`+ax.set(xlim=(0,1),ylim=(0,1))`
`42`	`44`	`plt.show()`
`43`	`45`
`44`	`46`	`# %%`
`@@ -57,3 +59,5 @@`
`57`	`59`	`#`
`58`	`60`	# `~.Axes.axhspan`, `~.Axes.axvspan` draw rectangles that span the Axes in one
`59`	`61`	`# direction and are bounded in the other direction.`
	`62`	`+#`
	`63`	`+# .. tags:: component: annotation`

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`‎galleries/examples/pyplots/axline.pyrenamed to‎galleries/examples/lines_bars_and_markers/axline.py`

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