# how to name points in a plot?

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John on 10 May 2013
Commented: Sushree Patra on 8 Dec 2018
Hello,
i am interested in naming points of my plot wiht numbers. So i tried it the following way where i is the number that should describe my node.
for i=1:length(xk)
plot(xk(i),yk(i),sprintf( '#%i'))
i=i+1;
hold on
end
but it didnt work and this error occured:
--->??? Error using ==> plot
--->Error in color/linetype argument
--->Error in ==> Plotten at 51
---> plot(xk(i),yk(i),sprintf( '#%i'))
can anyone help me with that please?
with best regards, John

Stephan M. H. on 10 May 2013
Hi John,
where you used sprint, the plot function expects as input LineSpec or 'PropertyName' followed by Propertyvalue.
I guess a direct way would be using the text function
...
plot(xk(i),yk(i))
text(xk(i),yk(i),num2str(i))
best,
Stephan
##### 3 CommentsShow 1 older commentHide 1 older comment
Azzi Abdelmalek on 10 May 2013
What i=i+1 is doing in your code?
John on 12 May 2013
thx i found the mistake...the irritation was due to strange loops^^
it works well now and the numbers arent overwritten anymore.

Azzi Abdelmalek on 10 May 2013
Edited: Azzi Abdelmalek on 10 May 2013
for i=1:length(xk)
text(xk(i),yk(i),num2str(i))
hold on
end
Sushree Patra on 8 Dec 2018
Without for loop how to provide the numbering to each point.
Means if
x1= 167*rand (50,1);
y1=302* rand (50,1);
plot(x1,y1,'b*');