MATLAB: How can display points as coordinates

points array coordinates

I need to display points in two array as coordinates. How is it possible

Best Answer

x = rand(10,1) ;
y = rand(10,1) ;
plot(x,y,'.r')
text(x,y,strcat('(',num2str(x),',',num2str(y),')')) ;

Related Solutions

MATLAB: How to label the data points with the corresponding index/x-coordinate/y-coordinate

The following pieces of code will demonstrate two examples of how this might be done.

This example labels the data points with their corresponding x-coordinate values.

% Define x and y

x = (5:30);
y = sin(x);
% Open a new figure

figure;
% Turn hold on so all the points can 

% be plotted individually

hold on;
% Calculation for the amount by which the

% label should be displaced in the 'y'

% direction

lbl_dwn = .1*max(y);
% plot and label the individual points

for i = 1:length(x)
     plot(x(i),y(i),'r+');
     % Label the points with the corresponding 'x' value
     text(x(i),y(i)+lbl_dwn,num2str(x(i)));
end
This example labels the data points with the corresponding index of the element.
% Define x and y
x = (5:30);
y = sin(x);
% Open a new figure
figure;
% Turn hold on so all the points can 
% be plotted individually
hold on;
% Calculation for the amount by which the
% label should be displaced in the 'y'
% direction
lbl_dwn = .1*max(y);
% plot and label the individual points
for i = 1:length(x)
     plot(x(i),y(i),'r+');
     % Label the points with the index
     text(x(i),y(i)+lbl_dwn,num2str(i));
end

MATLAB: How to display coordinates of points in “contourf”

It's going to look real messy when you have high resolution x and y data.

%%Some data
[x,y,z]=peaks(20);
[~,c]=contourf(x,y,z);hold on
set(gca,'XTick',[],'YTick',[]);
%%Create cell array with coordinates
C = reshape([x(:)'; y(:)'], [], 1)';
str=sprintf('[%.2g;%.2g],',C);
str=strsplit(str,',')
str(end) = [];
%%Plot labels
text(x(:),y(:),str(:),'fontsize',6,'horizontalalignment','center','verticalalignment','mid')

Or alternatively, with the undocumented sprintfc (courtesy Walter Roberson)

%%Same code as above, until:
str=sprintfc('[%.2g;%.2g]',C);
text(x(:),y(:),str(:),'fontsize',6,'horizontalalignment','center','verticalalignment','mid')

Best Answer

Related Solutions

MATLAB: How to label the data points with the corresponding index/x-co​ordinate/y​-coordinat​e

MATLAB: How to display coordinates of points in “contourf”

Related Question

MATLAB: How to label the data points with the corresponding index/x-coordinate/y-coordinate