Updating examples

Author: AllenDowney

examples/salmon.ipynb

@@ -107,7 +107,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -124,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -141,7 +141,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -161,16 +161,16 @@
    "source": [
     "## Modeling changes\n",
     "\n",
-    "To see how the population changes from year-to-year, I'll use `diff` to compute the absolute difference between each year and the next.\n"
+    "To see how the population changes from year-to-year, I'll use `diff` to compute the absolute difference between each year and the next and `shift` to align the changes with the year they happened."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [],
    "source": [
-    "abs_diffs = pop_series.diff()\n",
+    "abs_diffs = pop_series.diff().shift(-1)\n",
     "abs_diffs"
    ]
   },
@@ -183,7 +183,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -195,12 +195,13 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "These relative differences are observed annual net growth rates.  So let's drop the `0` and save them."
+    "These relative differences are observed annual net growth rates.\n",
+    "So let's drop the `NaN` and save them."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 10,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -217,7 +218,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 28,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -237,7 +238,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 29,
+   "execution_count": 12,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -256,7 +257,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 30,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -276,7 +277,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 31,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -292,7 +293,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": 15,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -308,7 +309,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -341,7 +342,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 35,
+   "execution_count": 17,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -357,7 +358,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 42,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -370,8 +371,7 @@
     "    \"\"\"\n",
     "    for i in range(iters):\n",
     "        results = run_simulation(system, update_func)\n",
-    "        results.plot(color='gray', label='_nolegend', \n",
-    "                     linewidth=1, alpha=0.3)"
+    "        results.plot(color='gray', label='', linewidth=1, alpha=0.3)"
    ]
   },
   {
@@ -385,7 +385,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 43,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -414,7 +414,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 45,
+   "execution_count": 20,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -432,7 +432,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 50,
+   "execution_count": 21,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -448,7 +448,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 51,
+   "execution_count": 22,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -464,7 +464,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 52,
+   "execution_count": 23,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -481,7 +481,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 53,
+   "execution_count": 24,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -500,7 +500,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 54,
+   "execution_count": 25,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -516,7 +516,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 55,
+   "execution_count": 26,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -532,7 +532,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 56,
+   "execution_count": 27,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -567,7 +567,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 66,
+   "execution_count": 28,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -585,7 +585,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 59,
+   "execution_count": 29,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -601,7 +601,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
+   "execution_count": 30,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -617,7 +617,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 61,
+   "execution_count": 31,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -633,7 +633,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 62,
+   "execution_count": 32,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -649,7 +649,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 63,
+   "execution_count": 33,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -665,7 +665,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 64,
+   "execution_count": 34,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -689,7 +689,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.16"
+   "version": "3.10.13"
   }
  },
  "nbformat": 4,