I have a 2D line plot:
d3 = [1, 3, 5, 6, 8, 9];
plot(d3, '-ob');
I would like to know how to insert a value into the markers of the line plot, such as inserting the y values into the center of the markers. For example:
Would this be possible?
Use text and properly adjust the text properties to suit your purpose. You may have to play with the marker size and text alignment, but it's a fairly straightforward process.
For example:
% plot the data
figure
d3 = [1, 3, 5, 6, 8, 9];
n = 1:numel(d3);
plot(n,d3, '-ob','markersize',10,'markerfacecolor','w');
% step through the points in d3 and display a text label for each of them
for idx = 1:numel(d3)
text(n(idx),d3(idx), num2str(d3(idx)),...
'FontSize',8,...
'HorizontalAlignment','center');
end
There is a way of plotting digits in circle using some special fonts (for example, WingDings 2 has numbers in circle from digit 0 to 9). You may find some other free font with 2 digits in circle or square.
Here is the sample code.
font_numberCircle = 'WingDings 2';
x = 1:6;
y = rand(1,6);
m = {'j','l','n','o','q','r'}; %the markers to be plotted ('j' is 1 and 'r' is 9
figure('Color', 'w');
plot(x, y, 'r');
text(x, y, m, 'FontName', font_numberCircle, ...
'FontSize', 40, 'FontWeight', 'bold', ...
'HorizontalAlignment', 'center' )
set(gca, 'XLim', [0 7], 'YLim', [-0.1 1.1] );
Related
I would like to plot the grouped bar chart for the comparison of three methods. I tried the following code and it is displayed as stacked bar chart.can you please help
dice =[0, 3, 5];
no_of_region=[42, 12, 5];
figure;
bar(dice',.2,'grouped','FaceColor',[0 .5 .5],'EdgeColor',[0 .9 .9],'LineWidth',1.5)
ylabel('Dice Similarity index')
yyaxis right
bar(no_of_region, .2,'grouped','EdgeColor', 'r', 'LineWidth', 2);
legend('Dice Similarity Index','Number of regions')
legend('Location','northwest')
XTickLabel={'a' ; 'b';'c'};
XTick=[1 2 3]
set(gca, 'XTick',XTick);
set(gca, 'XTickLabel', XTickLabel);
set(gca, 'XTickLabelRotation', 45);
xlabel('Different Methods', 'Fontsize', 16)
ylabel('Number of Regions', 'Fontsize', 16)
title('Comparison of Algorithms', 'fontsize', 20);
set(gcf,'color','w');
OUTPUT I GOT AS:
One easy solution is to shift the bars left and right by half of their width (or more if you would like space between them). Here is the new code, which is also cleaned a bit stylistically:
% parameters
dice = [0, 3, 5];
no_of_region = [42, 12, 5];
X = [1, 2, 3]; % common x values for plot
bar_width = 0.2; % width of bars
% initialize figure
figure;
% left plot
bar(X.' - bar_width/2, dice', bar_width, 'grouped', ...
'FaceColor', [0 .5 .5], ...
'EdgeColor', [0 .9 .9], ...
'LineWidth', 1.5);
ylabel('Dice Similarity index');
% right plot
yyaxis right;
bar(X.' + bar_width/2, no_of_region, bar_width, 'grouped', ...
'EdgeColor', 'r', ...
'LineWidth', 2);
% plot formatting
legend({'Dice Similarity Index', 'Number of regions'}, ...
'Location', 'northwest');
XTickLabel = {'a' ; 'b'; 'c'};
XTick = X;
set(gca, ...
'XTick', XTick, ...
'XTickLabel', XTickLabel, ...
'XTickLabelRotation', 45);
xlabel('Different Methods', 'FontSize', 16);
ylabel('Number of Regions', 'FontSize', 16);
title('Comparison of Algorithms', 'FontSize', 20);
set(gcf, 'color', 'w');
Depending on desired behavior, you also might consider replacing figure; by clf;, which clears the existing figure or opens a new figure window if there is not already one open.
I would like to indicate p-values between multiple bar graphs as in the figure below:
But I have not found relevant commands about this on MATLAB's page on bar graphs.
Here is my code for the bar graphs and the standard deviation graphics:
x = 1:3;
y = [17.5, 97.5, 100];
std = [23.84848004, 10.89724736, 0];
figure
hold on
bar(x,y)
errorbar(y,std,'.')
XTickLabel={'1' ; '2'; '3' ; '4'};
XTick=2:4:15
set(gca, 'XTick',XTick);
set(gca, 'XTickLabel', XTickLabel);
There is no such function that I know of, but it is easy to write one:
function [hl,ht] = overbar(x1, x2, y, txt)
sz = get(gca,'FontSize');
bg = get(gca,'Color');
d = 2; % size of hook, change depending on y axis scaling
hl = line([x1,x1,x2,x2], [y,y+d,y+d,y]);
ht = text((x1+x2)/2, y+d, txt, ...
'HorizontalAlignment','center', ...
'VerticalAlignment','middle', ...
'FontSize',sz, ...
'BackgroundColor',bg);
end
This function uses the axes' font size and color properties to determine how to draw the text. It first draws the line, then draws the text on top, using a solid background so that the line appears interrupted by the text.
This is how you would use it:
x = 1:3;
y = [17.5, 97.5, 100];
std = [23.84848004, 10.89724736, 0];
figure
hold on
set(gca, 'FontSize',16)
bar(x, y)
errorbar(y, std, '.')
set(gca, 'ylim',[0,150]);
XTickLabel = {'A', 'B', 'C'};
set(gca, 'xtick',x, 'XTickLabel',XTickLabel);
overbar(1 ,2, 120, 'p=0.037');
overbar(2, 3, 130, 'p<0.0001');
overbar(1, 3, 140, 'p<0.0001');
The documentation specifies only 10 types of markers in a scatter plot:
http://uk.mathworks.com/help/matlab/ref/scatter.html
I need 30. My current string for marker types is:
markers = '+o*.xsd^v<>h';
I don't want to reuse the same markers. Entering other letters etc. results in a crash. Letters of the alphabet would be acceptable markers. Is there a way to have more than 10 types of markers?
Edit: I'm already using colors to indicate something else.
Several function can be used to emulate the behaviour of scatter. Here we use both text and plot to create unique markers.
On the left, markers with numbers and dots, on the right circle and arrows (thanks to unicode).
Computation:
N = 50;
x = rand(N,1);
y = rand(N,1);
%numbers in text
txt1 = cellstr(num2str((11:11+N-1)'));
%unicode text
Nstart = 8592; %arrows
txt2 = cellstr(char(Nstart:Nstart+N-1)');
figure;
subplot(1,2,1);
h = text(x, y, txt1, ...
'FontName', 'Courier New', 'FontSize', 18, ...
'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');
hold on;
plot(x, y, 'r.', 'MarkerSize', 10)
subplot(1,2,2);
h = text(x, y, txt2, ...
'FontSize', 20, ...
'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');
hold on;
plot(x, y, 'o', 'MarkerSize', 22)
You can use text to plot letters at particular locations. It will be much less efficient because each point will require a new graphics object.
I would like to draw four circles of two colors. I'm using circle function to draw a circle. I'm facing problem with legend(). It colors the two data with the same color.
function main
clear all
clc
circle([ 10, 0], 3, 'b')
circle([-10, 0], 3, 'b')
circle([ 10, 10], 3, 'r')
circle([-10, 10], 3, 'r')
% Nested function to draw a circle
function circle(center,radius, color)
axis([-20, 20, -20 20])
hold on;
angle = 0:0.1:2*pi;
grid on
x = center(1) + radius*cos(angle);
y = center(2) + radius*sin(angle);
plot(x,y, color, 'LineWidth', 2);
xlabel('x-axis');
ylabel('y-axis');
title('Est vs Tr')
legend('true','estimated');
end
end
The following picture shows the problem. Both colored as blue instead one of them is red.
Any suggestions?
You can make your function circle() return the plot handles. Store the handles in a vector. In the end, you only call legend() once, after plotting all circles. The first argument in legend are then the function handles which you want to appear in the legend. Something like this:
function main
% clear all % functions have their own workspace, this should always be empty anyway
clc
handles = NaN(1,2);
handles(1,1) = circle([ 10, 0], 3, 'b'); % handle of a blue circle
circle([-10, 0], 3, 'b')
handles(1,2) = circle([ 10, 10], 3, 'r'); % handle of a red circle
circle([-10, 10], 3, 'r')
% Nested function to draw a circle
function h = circle(center,radius, color) % now returns plot handle
axis([-20, 20, -20 20])
hold on;
angle = 0:0.1:2*pi;
grid on
x = center(1) + radius*cos(angle);
y = center(2) + radius*sin(angle);
h = plot(x,y, color, 'LineWidth', 2);
xlabel('x-axis');
ylabel('y-axis');
title('Est vs Tr')
end
% legend outside of the function
legend(handles, 'true','estimated'); % legend for a blue and a red circle handle
end
The result looks like this:
The thing is that you draw 4 things and only have 2 entries in the legend.
As such it will pick the color of the first four things to color the legend.
Not in the opportunity to try it myself now, but I guess that the easiest 'solution' would be to draw your third circle first and then the second one.
circle([ 10, 0], 3, 'b')
circle([ 10, 10], 3, 'r')
circle([-10, 0], 3, 'b')
circle([-10, 10], 3, 'r')
I want to plot something like this:
x = 0:0.01:10;
f = #(x) 50* 1.6.^(-x-5);
g = #(x) 50* 1.6.^(+x-10);
plot(x, f(x));
hold on
plot(x, g(x));
I can't manage to get axes similar to the ones in this figure:
I know I can remove the top and right lines like in this question, but I don't know how to get the arrows on the edges.
I don't need the additional annotations, but I would like to remove the ticks on the axes. I know how to do this when the axes are "normal", but I'm not sure if it must be done in another way when the axes are already manipulated.
Does anyone know how to do this?
Well, don't say I didn't warn you :)
% Some bogus functions
f = #(x) 50* 1.6.^(-x-5);
g = #(x) 50* 1.6.^(+x-10);
% Point where they meet
xE = 2.5;
yE = f(xE);
% Plot the bogus functions
figure(1), clf, hold on
x = 0:0.2:5;
plot(x,f(x),'r', x,g(x),'b', 'linewidth', 2)
% get rid of standard axes decorations
set(gca, 'Xtick', [], 'Ytick', [], 'box', 'off')
% Fix the axes sizes
axis([0 5 0 5])
% the equilibrium point
plot(xE, yE, 'k.', 'markersize', 20)
% the dashed lines
line([xE 0; xE xE], [0 yE; yE yE], 'linestyle', '--', 'color', 'k')
% the arrows
xO = 0.2;
yO = 0.1;
patch(...
[5-xO -yO; 5-xO +yO; 5.0 0.0], ...
[yO 5-xO; -yO 5-xO; 0 5], 'k', 'clipping', 'off')
% the squishy wiggly line pointing to the "equilibrium" text
h = #(x)0.5*(x+0.2) + 0.1*sin((x+0.2)*14);
x = 2.7:0.01:3.5;
plot(x, h(x), 'k', 'linewidth', 2)
% the static texts
text(xE-yO, -0.2, 'Q^*', 'fontweight', 'bold')
text(-2*yO, yE, 'P^*', 'fontweight', 'bold')
text(-2*yO, 4, 'Price', 'rotation', 90, 'fontsize', 14)
text( 4, -0.2, 'Quantity', 'fontsize', 14)
text( .5, 4.2, 'Demand', 'fontsize', 14, 'rotation', -55)
text( 4.0, 3.3, 'Supply', 'fontsize', 14, 'rotation', +55)
text( 3.6, 2.1, 'Equilibrium', 'fontsize', 14)
Result:
The symbolic math toolbox has provisions for making these arrows, but without that toolbox you are stuck with drawing the arrows yourself. The following code should be useful for this purpose:
% determine position of the axes
axp = get(gca,'Position');
% determine startpoint and endpoint for the arrows
xs=axp(1);
xe=axp(1)+axp(3)+0.04;
ys=axp(2);
ye=axp(2)+axp(4)+0.05;
% make the arrows
annotation('arrow', [xs xe],[ys ys]);
annotation('arrow', [xs xs],[ys ye]);
% remove old box and axes
box off
set(gca,'YTick',[])
set(gca,'XTick',[])
set(gca,'YColor',get(gca,'Color'))
set(gca,'XColor',get(gca,'Color'))
The only drawback is that for some figure window sizes you will have a 1-pixel white border below the arrows, and setting the LineWidth property of the axes to a ridiculous small value does not help.
But for printing, the small white border should not be relevant.