write indexes in a plot

Dear

I have a matrix P with n rows and two columns, each of the column store the x and y position of a particle.

Represent the particle postions is easy (plot(P(:,1),P:,2)), I would like to write the index of each particle just beside each point

How can I do it?

Many thanks!!

Answer 1

[Giuseppe Inghilterra]

Hi,

look this answer: https://www.mathworks.com/matlabcentral/answers/97277-how-can-i-apply-data-labels-to-each-point-in-a-scatter-plot-in-matlab-7-0-4-r14sp2

Example code taken from above answer:

x = 1:10; y = 1:10; scatter(x,y);
a = [1:10]'; b = num2str(a); c = cellstr(b);
dx = 0.1; dy = 0.1; % displacement so the text does not overlay the data points
text(x+dx, y+dy, c);

This should resolve your problem.

[Luis Isaac]

yes, this is what I am looking for

But a final question, Is there any way to control the size of the numerical labels of each point?

[Giuseppe Inghilterra]

You can specify fontsize property as follow:

text(x+dx, y+dy, c,'FontSize',k);

with k as scalar value equal to your desired fontsize.