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-rw-r--r--graphics/circuit_macros/examples/extras/Parallel-series.m415
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diff --git a/graphics/circuit_macros/examples/extras/Parallel-series.m4 b/graphics/circuit_macros/examples/extras/Parallel-series.m4
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+++ b/graphics/circuit_macros/examples/extras/Parallel-series.m4
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+.PS
+# parallel-series.m4
+# https://tex.stackexchange.com/questions/709074/how-to-plot-a-block-diagram-with-tikz
+cct_init
+
+ dot; line right_ dimen_/2
+ parallel_(
+ parallel_(
+ `ebox(,wdth=0.2;text="$x_1$")',
+ `Sep=dimen_*3/4;ebox(,wdth=0.2;text="$x_2$")'),
+ Sep=dimen_;series_(
+ `ebox(,wdth=0.2;text="$x_3$")',
+ `ebox(,wdth=0.2;text="$x_4$")'))
+ line right_ dimen_/2; dot
+.PE