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Replace plot data instead of erasing, replotting #1

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13 changes: 6 additions & 7 deletions ipywidgets-tutorial.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -183,22 +183,21 @@
"ax.set_ylim([-4, 4])\n",
"ax.grid(True)\n",
"\n",
"# generate x values\n",
"# generate x values and create placeholder plot\n",
"x = np.linspace(0, 2 * np.pi, 100)\n",
"\n",
"scope = ax.plot(x, x, color='C0')\n",
"\n",
"def my_sine(x, w, amp, phi):\n",
" \"\"\"\n",
" Return a sine for x with angular frequeny w and amplitude amp.\n",
" Return a sine for x with angular frequency w and amplitude amp.\n",
" \"\"\"\n",
" return amp*np.sin(w * (x-phi))\n",
"\n",
"\n",
"@widgets.interact(w=(0, 10, 1), amp=(0, 4, .1), phi=(0, 2*np.pi+0.01, 0.01))\n",
"def update(w = 1.0, amp=1, phi=0):\n",
" \"\"\"Remove old lines from plot and plot new one\"\"\"\n",
" [l.remove() for l in ax.lines]\n",
" ax.plot(x, my_sine(x, w, amp, phi), color='C0')"
"def update(w=1.0, amp=1, phi=0):\n",
" \"\"\"Replace data of plot with new one\"\"\"\n",
" scope[0].set_ydata(my_sine(x, w, amp, phi))\n"
]
},
{
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