Overlay graphs with sympy

Overlay graphs with sympy

How to overlay when plotting formulas in sympy

import sympy as sym
sym.init_printing()

Part 1

sym.var("x")
expr = 1/(1+ sym.exp(-x))

ax1 = sym.plot(expr, line_color="blue", show=False)
ax2 = sym.plot(expr.diff(x), line_color="red", show=False)
ax1.extend(ax2)
ax1.show()

download.png

Part 2

sym.var("x")
expr = 1/(1+ sym.exp(-x))

ax1 = sym.plot(expr, expr.diff(x), legend=True, show=False)
ax1[1].line_color="red"
ax1.show()

The legend is displayed with legend = True.

download.png

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