Syntax for modifying 'LineWidth' in graph?

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Robert on 3 May 2017
Answered: Matthew Eicholtz on 3 May 2017
Hello, my apologies because I expect this is a very simple issue, but I am having difficulty modifying the 'LineWidth' attribute for a figure from the command line, my use of the 'ax.LineWidth' is obviously not correct (below).
I am using version 2017a, so I don't need to use the set/get functions, is that correct?
  1 Comment
Jan on 3 May 2017
You did not mention what you want to achieve. The figure does not have a linewidth. The shown command looks like you want to modify the width of the box around an axes? But instead of guessing what you mean, I ask you.

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Answers (3)

dpb on 3 May 2017
Not enough context to tell for certain but looks like from variable name that ax is probably an axes handle...if so, the 'LineWidth' property is associated not with the axes but the line handle (typically returned by plot)
'box' is a property of an axes but only has values of 'off','on', though so the arguments to the function box are wrong (unless you've aliased it with something of your own definition which is strongly recommended to not do.

Robert on 3 May 2017
I found a solution! The problem I was running into was attempting to use the syntax
which came from the help menus. However, a bit of digging led to
ax = gca; ax.LineWidth = 2;
which works. Thanks for your help!

Matthew Eicholtz
Matthew Eicholtz on 3 May 2017
If you have a figure,
% something plotted here...
ax = gca; %axes handle
Then to change the line width of the axes, simply use:
ax.LineWidth = 2; %or whatever number you like


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