How to plot matrix points with label

This might be a dumb question, but I am iniciating in Matlab and i want to know how can I plot matrix points and give then names.

 Z =
     1     2
     3     4
    55     1
     4     4
    90   100

As example, this would have 5 points, being x1(1,2), x2(3,4), x3(55,1).. etc

Thanks in advance

Answer 1

[Chad Greene]

Plot the points with the plot function like this. Here I'm making them red x marks by specifying 'rx':

plot(Z(:,1),Z(:,2),'rx')

Or since those numbers span a big range and some are clustered near zero, perhaps you want a loglog axis scaling:

loglog(Z(:,1),Z(:,2),'rx')

Take your pick of plot or loglog, then label each point with the text function.

names = {'x1';'x2';'x3';'x4';'x5'};  
text(Z(:,1),Z(:,2),names)

If you want to make the text labels red, italics, and centered on the points, do so like this:

text(Z(:,1),Z(:,2),names,'color','red','fontangle','italic','horizontalalignment','center','verticalalignment','middle')

[MIGUEL FILHO]

THanks so much, worked perfectly