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xline issue with adding a number to the line through the labels option

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Is there a reason why the xline (or yline) functions won't accept a number converted to a string
c=b(3); %Breakpoint
cs=num2str(c)
class(cs)
xline(ax3,c,cs);
cs =
'125.7048'
ans =
'char'
Error using xline
Invalid parameter/value pair arguments.

Accepted Answer

Aditya
Aditya on 4 Jun 2024
Hi Jason,
In MATLAB, the xline function is designed to add vertical lines to a plot and allows for customization through various parameters, including adding a label directly to the line. However, this customization needs to be done using 'Name,Value' pairs. When you attempt to pass the string representation of a number directly as an argument, without specifying it as part of a 'Name,Value' pair, MATLAB does not recognize it as a valid input, leading to the "Invalid parameter/value pair arguments" error.
To add a label to your line correctly, you need to use the 'Label' option followed by the string you wish to use as the label. Here's how you can adjust your code:
% Correct way to add Label
xline(ax3,c,'Label',cs);
I hope this clears up the confusion!
  3 Comments
Jason
Jason on 4 Jun 2024
and to further add, reading again it says this:
To create a line with a label, you must also specify the line style. The default line style is a solid line, '-'.
x = linspace(0,6,100);
y = exp(x);
plot(x,y)
xline(4.5,'-',{'Acceptable','Limit'});
So it is possible without the 'Label' but you need to specify the line stsyle, so actually this worked also.
xline(ax3,c,'-',cs);

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