diff --git a/tools_numpy.ipynb b/tools_numpy.ipynb
index ee254d1..4c3c610 100644
--- a/tools_numpy.ipynb
+++ b/tools_numpy.ipynb
@@ -58,9 +58,7 @@
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@@ -87,9 +85,7 @@
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@@ -127,9 +123,7 @@
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@@ -152,9 +146,7 @@
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@@ -174,9 +166,7 @@
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@@ -196,9 +186,7 @@
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@@ -226,9 +214,7 @@
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@@ -262,9 +248,7 @@
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@@ -294,9 +278,7 @@
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@@ -326,9 +308,7 @@
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@@ -359,7 +339,6 @@
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@@ -390,9 +369,7 @@
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@@ -422,7 +399,6 @@
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@@ -451,9 +427,7 @@
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@@ -480,9 +454,7 @@
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@@ -509,9 +481,7 @@
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@@ -540,9 +510,7 @@
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@@ -568,9 +536,7 @@
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@@ -599,9 +565,7 @@
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@@ -631,7 +595,6 @@
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@@ -643,9 +606,7 @@
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@@ -680,9 +641,7 @@
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@@ -713,7 +672,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "NumPy first creates three `ndarrays` (one per dimension), each of shape `(3, 2, 10)`. Each array has values equal to the coordinate along a specific axis. For example, all elements in the `z` array are equal to their z-coordinate:\n",
+    "NumPy first creates three `ndarrays` (one per dimension), each of shape `(2, 10)`. Each array has values equal to the coordinate along a specific axis. For example, all elements in the `z` array are equal to their z-coordinate:\n",
     "\n",
     "    [[[ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]\n",
     "      [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]]\n",
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@@ -788,9 +744,7 @@
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@@ -850,7 +802,6 @@
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@@ -1042,9 +985,7 @@
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@@ -1075,9 +1016,7 @@
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@@ -1111,9 +1050,7 @@
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@@ -1143,7 +1080,6 @@
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@@ -1232,9 +1166,7 @@
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@@ -1262,9 +1194,7 @@
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@@ -1293,9 +1223,7 @@
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@@ -1323,9 +1251,7 @@
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@@ -1469,9 +1387,7 @@
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@@ -1562,9 +1474,7 @@
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@@ -2178,9 +2048,7 @@
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@@ -2209,9 +2077,7 @@
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@@ -2240,7 +2106,6 @@
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@@ -2269,9 +2134,7 @@
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@@ -2298,9 +2161,7 @@
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@@ -2322,9 +2183,7 @@
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@@ -2455,9 +2306,7 @@
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@@ -2507,7 +2354,6 @@
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@@ -2529,9 +2375,7 @@
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@@ -2622,9 +2463,7 @@
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@@ -2652,9 +2491,7 @@
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      "data": {
@@ -2834,7 +2659,6 @@
    "cell_type": "code",
    "execution_count": 96,
    "metadata": {
-    "collapsed": false,
     "scrolled": false
    },
    "outputs": [
@@ -2867,9 +2691,7 @@
   {
    "cell_type": "code",
    "execution_count": 97,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -2893,9 +2715,7 @@
   {
    "cell_type": "code",
    "execution_count": 98,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -2917,9 +2737,7 @@
   {
    "cell_type": "code",
    "execution_count": 99,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -2951,9 +2769,7 @@
   {
    "cell_type": "code",
    "execution_count": 100,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -2974,9 +2790,7 @@
   {
    "cell_type": "code",
    "execution_count": 101,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3004,9 +2818,7 @@
   {
    "cell_type": "code",
    "execution_count": 102,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3034,9 +2846,7 @@
   {
    "cell_type": "code",
    "execution_count": 103,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3063,9 +2873,7 @@
   {
    "cell_type": "code",
    "execution_count": 104,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
@@ -3091,9 +2899,7 @@
   {
    "cell_type": "code",
    "execution_count": 105,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
@@ -3126,9 +2932,7 @@
   {
    "cell_type": "code",
    "execution_count": 106,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
@@ -3177,9 +2981,7 @@
   {
    "cell_type": "code",
    "execution_count": 107,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3202,9 +3004,7 @@
   {
    "cell_type": "code",
    "execution_count": 108,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3228,9 +3028,7 @@
   {
    "cell_type": "code",
    "execution_count": 109,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3261,9 +3059,7 @@
   {
    "cell_type": "code",
    "execution_count": 110,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3293,9 +3089,7 @@
   {
    "cell_type": "code",
    "execution_count": 111,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3325,9 +3119,7 @@
   {
    "cell_type": "code",
    "execution_count": 112,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3350,9 +3142,7 @@
   {
    "cell_type": "code",
    "execution_count": 113,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3379,9 +3169,7 @@
   {
    "cell_type": "code",
    "execution_count": 114,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
@@ -3409,9 +3197,7 @@
   {
    "cell_type": "code",
    "execution_count": 115,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3441,9 +3227,7 @@
   {
    "cell_type": "code",
    "execution_count": 116,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3478,9 +3262,7 @@
   {
    "cell_type": "code",
    "execution_count": 117,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3507,9 +3289,7 @@
   {
    "cell_type": "code",
    "execution_count": 118,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3539,9 +3319,7 @@
   {
    "cell_type": "code",
    "execution_count": 119,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3574,9 +3352,7 @@
   {
    "cell_type": "code",
    "execution_count": 120,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3598,9 +3374,7 @@
   {
    "cell_type": "code",
    "execution_count": 121,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3621,9 +3395,7 @@
   {
    "cell_type": "code",
    "execution_count": 122,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3651,9 +3423,7 @@
   {
    "cell_type": "code",
    "execution_count": 123,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3679,9 +3449,7 @@
   {
    "cell_type": "code",
    "execution_count": 124,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3716,9 +3484,7 @@
   {
    "cell_type": "code",
    "execution_count": 125,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3756,9 +3522,7 @@
   {
    "cell_type": "code",
    "execution_count": 126,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3785,9 +3549,7 @@
   {
    "cell_type": "code",
    "execution_count": 127,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3814,9 +3576,7 @@
   {
    "cell_type": "code",
    "execution_count": 128,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3844,9 +3604,7 @@
   {
    "cell_type": "code",
    "execution_count": 129,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3873,9 +3631,7 @@
   {
    "cell_type": "code",
    "execution_count": 130,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3904,9 +3660,7 @@
   {
    "cell_type": "code",
    "execution_count": 131,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3937,9 +3691,7 @@
   {
    "cell_type": "code",
    "execution_count": 132,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3961,9 +3713,7 @@
   {
    "cell_type": "code",
    "execution_count": 133,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -3995,7 +3745,6 @@
    "cell_type": "code",
    "execution_count": 134,
    "metadata": {
-    "collapsed": false,
     "scrolled": true
    },
    "outputs": [
@@ -4019,7 +3768,6 @@
    "cell_type": "code",
    "execution_count": 135,
    "metadata": {
-    "collapsed": false,
     "scrolled": true
    },
    "outputs": [
@@ -4048,9 +3796,7 @@
   {
    "cell_type": "code",
    "execution_count": 136,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4071,9 +3817,7 @@
   {
    "cell_type": "code",
    "execution_count": 137,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4105,9 +3849,7 @@
   {
    "cell_type": "code",
    "execution_count": 138,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4129,9 +3871,7 @@
   {
    "cell_type": "code",
    "execution_count": 139,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4156,9 +3896,7 @@
   {
    "cell_type": "code",
    "execution_count": 140,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4194,9 +3932,7 @@
   {
    "cell_type": "code",
    "execution_count": 141,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4221,9 +3957,7 @@
   {
    "cell_type": "code",
    "execution_count": 142,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4252,9 +3986,7 @@
   {
    "cell_type": "code",
    "execution_count": 143,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4284,9 +4016,7 @@
   {
    "cell_type": "code",
    "execution_count": 144,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4315,9 +4045,7 @@
   {
    "cell_type": "code",
    "execution_count": 145,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4347,9 +4075,7 @@
   {
    "cell_type": "code",
    "execution_count": 146,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4372,9 +4098,7 @@
   {
    "cell_type": "code",
    "execution_count": 147,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4396,9 +4120,7 @@
   {
    "cell_type": "code",
    "execution_count": 148,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4428,9 +4150,7 @@
   {
    "cell_type": "code",
    "execution_count": 149,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4458,9 +4178,7 @@
   {
    "cell_type": "code",
    "execution_count": 150,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4481,9 +4199,7 @@
   {
    "cell_type": "code",
    "execution_count": 151,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4505,9 +4221,7 @@
   {
    "cell_type": "code",
    "execution_count": 152,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4537,9 +4251,7 @@
   {
    "cell_type": "code",
    "execution_count": 153,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4563,9 +4275,7 @@
   {
    "cell_type": "code",
    "execution_count": 154,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4589,9 +4299,7 @@
   {
    "cell_type": "code",
    "execution_count": 155,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4618,9 +4326,7 @@
   {
    "cell_type": "code",
    "execution_count": 156,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4645,9 +4351,7 @@
   {
    "cell_type": "code",
    "execution_count": 157,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4671,9 +4375,7 @@
   {
    "cell_type": "code",
    "execution_count": 158,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4703,9 +4405,7 @@
   {
    "cell_type": "code",
    "execution_count": 159,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4725,9 +4425,7 @@
   {
    "cell_type": "code",
    "execution_count": 160,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4764,9 +4462,7 @@
   {
    "cell_type": "code",
    "execution_count": 161,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4796,9 +4492,7 @@
   {
    "cell_type": "code",
    "execution_count": 162,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4826,7 +4520,6 @@
    "cell_type": "code",
    "execution_count": 163,
    "metadata": {
-    "collapsed": false,
     "scrolled": true
    },
    "outputs": [
@@ -4858,9 +4551,7 @@
   {
    "cell_type": "code",
    "execution_count": 164,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "import math\n",
@@ -4880,9 +4571,7 @@
   {
    "cell_type": "code",
    "execution_count": 165,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4911,9 +4600,7 @@
   {
    "cell_type": "code",
    "execution_count": 166,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -4948,9 +4635,7 @@
   {
    "cell_type": "code",
    "execution_count": 167,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "data = np.sin(X*Y/40.5)"
@@ -4966,9 +4651,7 @@
   {
    "cell_type": "code",
    "execution_count": 168,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5004,7 +4687,6 @@
    "cell_type": "code",
    "execution_count": 169,
    "metadata": {
-    "collapsed": false,
     "scrolled": true
    },
    "outputs": [
@@ -5028,9 +4710,7 @@
   {
    "cell_type": "code",
    "execution_count": 170,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "np.save(\"my_array\", a)"
@@ -5046,9 +4726,7 @@
   {
    "cell_type": "code",
    "execution_count": 171,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5078,9 +4756,7 @@
   {
    "cell_type": "code",
    "execution_count": 172,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5110,9 +4786,7 @@
   {
    "cell_type": "code",
    "execution_count": 173,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [],
    "source": [
     "np.savetxt(\"my_array.csv\", a)"
@@ -5128,9 +4802,7 @@
   {
    "cell_type": "code",
    "execution_count": 174,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
@@ -5175,9 +4847,7 @@
   {
    "cell_type": "code",
    "execution_count": 176,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5207,9 +4877,7 @@
   {
    "cell_type": "code",
    "execution_count": 177,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5254,9 +4922,7 @@
   {
    "cell_type": "code",
    "execution_count": 179,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5286,9 +4952,7 @@
   {
    "cell_type": "code",
    "execution_count": 180,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5316,9 +4980,7 @@
   {
    "cell_type": "code",
    "execution_count": 181,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5338,9 +5000,7 @@
   {
    "cell_type": "code",
    "execution_count": 182,
-   "metadata": {
-    "collapsed": false
-   },
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -5369,21 +5029,21 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.11"
+   "pygments_lexer": "ipython3",
+   "version": "3.5.5"
   },
   "toc": {
    "toc_cell": false,
@@ -5401,5 +5061,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 0
+ "nbformat_minor": 1
 }