MATLAB: Adding text in scatter plot

text in scatter plot

Hi All,

I am using a similar code as shown below to add text in a scatter plot in Matlab 2015a. However, I got the error message "Error using subsindex. Function 'subsindex' is not defined for values of class 'cell'." Can you please help me out why did I get that error even after I defined a3 = cellstr(a2)?

x = 1:5; y = 1:5; scatter(x,y); a1 = [1:5]'; a2 = num2str(a1); a3 = cellstr(a2); dx = 0.1; dy = 0.1; % displacement so the text does not overlay the data points text(x+dx, y+dy, a3);

Best Answer

I suspect you received that error when you executed the command "text(x+dx, y+dy, a3);". Is that correct? If so, you've probably defined a variable named text earlier in your code. To resolve the problem, rename your variable named text or delete it.

Related Solutions

MATLAB: How to apply data labels to each point in a scatter plot in MATLAB 7.0.4 (R14SP2)

You can apply different data labels to each point in a scatter plot by the use of the TEXT command. You can use the scatter plot data as input to the TEXT command with some additional displacement so that the text does not overlay the data points. A cell array should contain all the data labels as strings in cells corresponding to the data points. The following is an example:

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);

MATLAB: Plot multiple equations in a for loop

Please, use the {} Code button above the field you're writing your question to make the post be readable.

Also, you should learn about the array concept of Matlab. Your equations look kind of like scalar products, so most likely you can significantly shorten your code and avoid typos this way.

With respect to your question, in this case it's easier to loop with a counter from 1:7, create the respective ta from this and instead of writing data to scalars, save them in arrays. Such as

ta=zeros(1,7);
qe=zeros(1,7); 
for cnt=1:7
  ta(cnt)=cnt*5+15;
  qe(cnt)=...;
  ...
end
plot(ta,qe)

Best Answer

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MATLAB: How to apply data labels to each point in a scatter plot in MATLAB 7.0.4 (R14SP2)

MATLAB: Plot multiple equations in a for loop

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