Updated for last lecture

Author: Oiangu9

EXERCISES/Exercises_Lecture_04.ipynb

@@ -1276,7 +1276,7 @@
     "applying the logarithm in both sides\n",
     "\n",
     "$$\n",
-    "log(I)=At_1+B\\sqrt{t_2}+Ct_1^7t_2+D\n",
+    "log(I)=D+At_1+B\\sqrt{t_2}+Ct_1^7t_2\n",
     "$$\n",
     "\n",
     "where, if we define the variables $x_1=t_1$, $x_2=\\sqrt{t_2}$ and $x_3=t_1^7t_2$, together with $y=log(I)$, we get\n",
@@ -1285,7 +1285,7 @@
     "y=Ax_1+Bx_2+Cx_3+D\n",
     "$$\n",
     "\n",
-    "for which we know how to find $A,B,C,D$ from observed data! Note that for this, the matrix $X$ and vector $\\vec{y}$ would now be\n",
+    "for which we know how to find $D,A,B,C$ from observed data! Note that for this, the matrix $X$ and vector $\\vec{y}$ would now be\n",
     "\n",
     "$$\n",
     "X=\\begin{pmatrix}\n",

EXERCISES/Exercises_Lecture_05.ipynb

@@ -91,7 +91,7 @@
     "\n",
     "One of the first encoding standards for text was the so called ASCII standard based on the alphabet and symbols for English, which used 7 bits to encode about 127 different symbols or characters, among them the alphabetic characters, the numerical digits, symbols like `?` or `!` and some other special characters like `\\n` representing line breaks, or the EOF representing the end of a text file, among others.\n",
     "\n",
-    "Today there are several standardized encodings, and each operative system (OS) has its preferred ones. ASCII was the main encoding used in Internet until December 2007, when it was surpassed by UTF-8 using 8 bits (and thus allowing double symbols to be coded).\n",
+    "Today there are several standardized encodings, and each operative system (OS) has its preferred ones. ASCII was the main encoding used in Internet until December 2007, when it was surpassed by UTF-8 using until 4 blocks of 8 bits (and thus allowing to encode all the 1,112,064 symbols of the *unicode* standard, including most japanese, chinese, korean etc. characters).\n",
     "\n",
     "In the function `open()`, we can also add a thrid argument indicating the **encoding** for the characters we will deal with in this file. If we do not specify it, Python will just use the default encoding on the OS. But in general, we could specify any of the encodings listed in the following table of the official Python documentation:\n",
     "\n",