Final update for Matlab cheatsheet

Signed-off-by: Aaron Erhardt <aaron.erhardt@t-online.de>

Matlab/Matlab.md

@@ -126,6 +126,13 @@ diag(flip(A)) % other diagonal (bottom left to top right)
 x = A \ b % solves Ax = b
 ```
 
+## Find indices
+
+```matlab
+i = find(A);        % find all nonzero elements
+i = find(A > 1); 
+i = find(A < 1, 5); % get the first five elements
+```
 
 # Images
 
@@ -134,14 +141,14 @@ x = A \ b % solves Ax = b
 ```matlab
 img = imread('path_to_file')
 ```
-### 
-Show image
+
+### Show image
 
 ```matlab
 imagesc(img)
 ```
 
-Color map
+### Color map
 
 ```matlab
 colormap(gray()) % gray color map
@@ -283,6 +290,7 @@ fprintf(1, 'value: %d\n', 2)
 
 ```matlab
 save file_name
+save file_name a b c % only save a, b and c
 load file_name
 ```
 
@@ -309,6 +317,12 @@ fclose(file_handle)
 
 # Polynomials
 
+## Create polynomial from roots
+
+```matlab
+p = poly([1 -2 3]);
+```
+
 ## Fit polynomial to points
 
 ```matlab
@@ -323,6 +337,17 @@ p = polyfit(x, y, deg);
 y = polyval(p, x);
 ```
 
+## Multiply polynomials
+
+```matlab
+p3 = conv(p1, p2);
+```
+
+## Get roots
+
+```matlab
+r = roots(p);
+```
 
 # Graphics
 
@@ -689,12 +714,39 @@ opts = odeset('absTol', 0.05); % set absolute error tolerance
 [t y] = ode45(@pendfun, tspan, yNull, opts);
 ```
 
-### Other solving algorithms
+
+# Transfer functions
+
+## Create
 
 ```matlab
-ode23s % 
+G = tf([1 0], [2 0 0]);
 ```
 
+## Step response information
+
+```matlab
+S = stepinfo(G);
+```
+
+## Plot step response
+
+```matlab
+orstep(G);
+step(G, 0.2);
+```
+
+## Plot bode diagram
+
+```matlab
+bode(G);
+```
+
+## Plot nyquist diagram
+
+```matlab
+nyquist(G);
+```
 
 # Control structures
 
@@ -802,4 +854,4 @@ for i = x
 	y(cnt) = sin(i);
 	cnt = cnt + 1;
 end
-```
+```
\ No newline at end of file