Matlab lecture 26.4

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

Matlab/Matlab.md

@@ -222,6 +222,7 @@ disp('Hello')
 fprintf(1, 'value: %d\n', 2)
 ```
 
+
 # Datatypes
 
 ## Structs
@@ -285,6 +286,7 @@ table{1, 2} % row 1, column 2, note brackets!
 table{:, 2} % column 2
 ```
 
+
 # Save and load
 
 ## Workspace
@@ -338,7 +340,9 @@ y = polyval(p, x);
 
 # Graphics
 
-## Plot
+## Plots
+
+### Plot
 
 ```matlab
 x = 1:10;
@@ -347,6 +351,43 @@ plot(y);    % automatic x-axis
 plot(x, y); % custom x-axis
 ```
 
+### Stairs plot
+
+```matlab
+stairs(x, y); % plot values as stairs
+```
+
+### Discrete values
+
+```matlab
+ffty = fft(y);      % fast-fourier transform
+stem(x, abs(ffty)); % plot FFT
+```
+
+### Logarithmic
+
+```matlab
+loglog(x, y); % both axes are logarithmic
+```
+
+### Semi-logarithmic
+
+```matlab
+semilogx(x, y); % x-axes is logarithmic, y-axis is linear
+semilogy(x, y); % x-axes is linear, y-axis is logarithmic
+```
+
+## Charts
+
+### Bar
+
+```matlab
+h = bar([1 2 4 8]);       % create bar chart
+h.FaceColor = [0, 0.7 0]; % set properties
+```
+
+## Plot options
+
 ### Hold (keep previous plots)
 
 ```matlab
@@ -417,12 +458,68 @@ xlabel('\alpha'); % set x-label to α
 ylabel('y');
 ```
 
+### Axes
+
+```matlab
+axis([XMIN XMAX YMIN YMAX]); % set scaling of both axes
+```
+
 ## Figures
 
 ```matlab
-fig = figure
+fig = figure; % note: properties are case sensitive!
+fig = gcf;    % get handle to current figure
+```
+
+### Typical object hierarchy
+
+```mermaid
+graph Structure;
+  Figure-->Legend;
+  Figure-->Axes;
+  Axes-->Lines;
+```
+
+### Set color
+
+```matlab
+fig.Color = 'w';           % white
+fig.Color = [1.0 0.5 0.0]; % RGB
+```
+
+### Plot handles
+
+```matlab
+h = plot(x, y);    % get handle
+h.LineWidth = 1.3; % modify properties
+h.Marker = '.';    % set marker
 ```
 
+### Sub-plots
+
+```matlab
+fig = figure;
+subplot(2, 3, 1); % 2x3 matrix of plots, select first plot
+plot(x, y);       % first plot
+
+subplot(2, 3, 2); % 2x3 matrix of plots, select second plot
+loglog(x, y);     % second plot
+
+subplot(2, 3, 4); % 2x3 matrix of plots, select fourth plot
+semilogx(x, y);   % second row, first plot
+
+subplot(2, 3, 6); % 2x3 matrix of plots, select last plot
+semilogy(x, y);   % second row, third plot
+```
+
+Get handle
+
+```matlab
+handle = subplot(2, 3, 1);        % select first plot
+handle.Children(1).LineWidth = 2; % get line from handle and change width
+```
+
+
 # Control structures
 
 ## for-loop