Naotoshi Seo

Matlab Plot

Table of Contents

Plot Create a new figure window Use the same figure window Label Control axis scaling Title Legend - Display names for plotting lines Color and Marker Change color and marker after plotting Text property Change plotting window size and remove outside plotting window Grid log plot Change Labels of coordinates (Tick)

Plot

plot(xdata, ydata);

Create a new figure window

figure;

Use the same figure window

hold on;

ex)

figure; hold on;
plot(1:10,1:10);
plot(1:10,2:11);

Label

xlabel('xlabel');
ylabel('ylabel');

Control axis scaling

axis([xmin xmax ymin ymax]);

Title

title('title');

Title can show a math equation using TeX-like notation.

Legend - Display names for plotting lines

figure; hold on;
plot(1:10);
plot(2:11);
plot(3:12);
legend('1:10', '2:11', '3:12', 'Location', 'SouthEast');

Color and Marker

figure; hold on;
plot(1:10, 'r');
plot(2:11, 'g');

figure; hold on;
plot(1:10, 'ro');
plot(2:11, 'g+');

doc LineSpec

Change color and marker after plotting

set(findobj(gca,'Type','line','Color',[0 0 1]),'Color',color{i},'Marker',marker{i});

figure; hold on;
plot(1:10);
set(findobj(gca,'Type','line','Color','blue'),'Color','red','Marker','+');
plot(2:11);
set(findobj(gca,'Type','line','Color','blue'),'Color','green','Marker','o');
plot(3:12);
set(findobj(gca,'Type','line','Color','blue'),'Color',[0 0 0],'Marker','*'); % [r, g, b] is also okay for color

Do not use blue line.

Text property

http://nf.nci.org.au/facilities/software/Matlab/techdoc/ref/text_props.html

Change plotting window size and remove outside plotting window

size = [256 256];
fig = figure;
plot(1:10);
pos = get(fig, 'Position');
set(fig, 'Units', 'pixels', 'Position', ...
   [pos(1), pos(2)+pos(4)-size(1), ...
   size(2), size(1)]);
set(gca,'Position', [0 0 1 1], 'Visible', 'off');

Grid

grid

log plot

loglog
semilogx
semilogy

Change Labels of coordinates (Tick)

tau = [0 0.1..0.9 0.91..0.99 0.991..0.999 0.9991..0.9999];
y = tau.^2; % function of tau
plot(1:length(tau), y);
set(gca,'XTick',[1 10 19 28 37]);
set(gca,'XTickLabel','0|0.9|0.99|0.999|0.999');

doc % Graphics > Axes Properties > Individual Axis Control