MATLAB Answers

Input a variable into a plot title

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Luke
Luke on 10 Sep 2014
Commented: Alan Keenan on 21 May 2020
I've trawled through these forums and found loads on inputting variables as titles, however, none of them work for me. Im trying to change the title of a plot with respect to a parameter the user will enter in the function. First i call a string for example
str = sprintf('just an example of %d that isnt working', variable)
title(str)
However only the 'just an example of' is printed out on the title of the plot, everything after and including the variable has dissapeared, this happens when i move the variable about in the title too.
Cheers!

  3 Comments

Star Strider
Star Strider on 10 Sep 2014
Your code works perfectly for me (R2014a) with the string you posted. I can’t reproduce the error you report.
Soumitra Vadnerkar
Soumitra Vadnerkar on 26 Sep 2017
How about this, given in help documentation:
figure
plot((1:10).^2)
f = 70;
c = (f-32)/1.8;
title(['Temperature is ',num2str(c),' C'])
Alan Keenan
Alan Keenan on 21 May 2020
The answer given by Soumitra Vadnerkar works well for me.

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Accepted Answer

Steven Lord
Steven Lord on 22 May 2019
With the introduction of the string array in release R2016b (and the ability to enclose text data in double quotes to create a string in release R2017a) you can also use:
plot((1:10).^2)
f = 70;
c = (f-32)/1.8;
title("Temperature is " + c + " C")

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More Answers (2)

Adam
Adam on 10 Sep 2014
title( ['just an example of ' num2str( variable ) ' that isnt working'] )
Does that work?

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Walter Roberson
Walter Roberson on 14 Feb 2017
Dayan Guerra comments to Adam
Thank you, this is the only way I can it work, the sprintf() version is not working at all on mt2013
Walter Roberson
Walter Roberson on 14 Feb 2017
sprintf() would work fine in R2013* . However, the example given
str = sprintf('just an example of %d that isnt working', variable)
would be best for the case where the variable is an integer. If you have a variable that is numeric but not an integer, you would use a %e or %f or %g format.
Adam
Adam on 14 Feb 2017
sprintf is definitely a neater approach. Back in 2014 I was less familiar with using sprintf so it didn't spring to mind for this!

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MathWorks Support Team
MathWorks Support Team on 22 May 2019
How about this, given in help documentation:
plot((1:10).^2)
f = 70;
c = (f-32)/1.8;
title(['Temperature is ',num2str(c),' C'])

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