fixed EC typo

ayr13001 · Nov 13, 2017 · a053027 · a053027
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diff --git a/extra_credit/README.md b/extra_credit/README.md
@@ -41,7 +41,7 @@ and gradient
 
 ![costgrad](./equations/costgrad.png)
 
-where ![x](./equations/x.png) is the k-th value of temperature raised to the i-th power (0, and 1)
+where ![x](./equations/x.png) is the i-th value of temperature raised to the k-th power (0, and 1)
 
 a. edit `cost_logistic.m` so that the output is `[J,grad]` or [cost, gradient]
 

diff --git a/extra_credit/equations/cost.png b/extra_credit/equations/cost.png
diff --git a/extra_credit/equations/cost.tex b/extra_credit/equations/cost.tex
@@ -1,2 +1,2 @@
-J(a_{0},a_{1})=1/m\sum_{i=1}^{n}\left[-y_{i}\log(\sigma(t_{i}))-(1-y_{i})\log((1-\sigma(t_{i})))\right]
+J(a_{0},a_{1})=\sum_{i=1}^{n}\left[-y_{i}\log(\sigma(t_{i}))-(1-y_{i})\log((1-\sigma(t_{i})))\right]
 
diff --git a/extra_credit/equations/costgrad.png b/extra_credit/equations/costgrad.png
diff --git a/extra_credit/equations/costgrad.tex b/extra_credit/equations/costgrad.tex
@@ -1,2 +1,2 @@
-\frac{\partial J}{\partial a_{i}}=1/m\sum_{k=1}^{N}\left(\sigma(t_{k})-y_{k}\right)x_{k}^{i}
+\frac{\partial J}{\partial a_{k}}=\sum_{i=1}^{N}\left(\sigma(t_{k})-y_{k}\right)x_{i}^{k}
 
diff --git a/extra_credit/equations/sigma.png b/extra_credit/equations/sigma.png
diff --git a/extra_credit/equations/t.png b/extra_credit/equations/t.png
diff --git a/extra_credit/equations/x.png b/extra_credit/equations/x.png