how can i write the number of line?

Question

Thar 2015-1-24

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回答： Image Analyst 2015-1-25

Hi!

I have a 2D plot and I want to appear on each point of the graph, the number of lines corresponding to the matrix of data.

Is there any way?

Thank you!

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Giorgos Papakonstantinou 2015-1-24

Hi Thodoris. Can you explain a bit more your question? I don't understand which lines you want to show in the 2D plot?

Thar 2015-1-25

在 MATLAB Online 中打开

my data are in two columns:

3.345
4.456
5.789

I have the plot from these data. I want to each point in the graph to write the number of line. for example, in the point (300, 3.345) to write 1.

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Answer 1

Geoff Hayes 2015-1-25

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Thodoris - if you want to write the row (or line) that each point corresponds to, try using the text function. Something like

 figure;
 data = [300 3.345
         301 4.456
         303 5.789];
 xlim([min(data(:,1))-1,max(data(:,1))+1]);
 ylim([min(data(:,2))-1,max(data(:,2))+1]);
 sRows = num2str([1:size(data,1)]');
 text(data(:,1),data(:,2),sRows);

The xlim and ylim are just used for illustration purposes to ensure that we can see the area we are interested in (that given by data). We then create a vector of strings, one for each row number using

sRows = num2str([1:size(data,1)]');

and then label each point in data with those strings using text.

Try the above and see what happens!

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Answer 2

Image Analyst 2015-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/171412-how-can-i-write-the-number-of-line#answer_165894

在 MATLAB Online 中打开

Try this:

m=[...
  300 3.345
  301 4.456
  303 5.789]
for row = 1 : size(m, 1)
  x = m(row, 1);
  y = m(row, 2);
  plot(x, y, 'b*', 'MarkerSize', 15);
  hold on;
  caption = sprintf('(%.3f, %.3f)', x, y);
  text(x+0.8, y, caption, 'FontSize', 15);
end
grid on;
xlim([296, 315]);