How to subscript in figures

Hello everyone,

I want to have subscript labels in axeses in matlab. Let say I have

J = [1 2 3; 4 5 6];
bar(J);

set(gca,'XTickLabel',{'I_0','I_1'});

I can't get I_0 in subscript. How can I do this. I m using Matlab 2009 on Ubuntu.

Answer 1

[Star Strider]

Here is one way, there may be others:

J = [1 2 3; 4 5 6];
bar(J);

set(gca,'XTickLabel','');
set(gca, 'XTickLabelMode','manual')
hxt = get(gca, 'XTick')
ypos = min(ylim) - diff(ylim)*0.05;
text(hxt, [1 1]*ypos, {'I_0','I_1'}, 'HorizontalAlignment', 'center')

You will have to experiment with the ypos value for text to put it exactly where you want it. I did my best to make it as adaptive as I could.

[Image Analyst]

By the way, usually I have the opposite problem. I often put the title of the image as the filename, and if the filename has an underline in it , it makes the character following the underline a subscript, which looks ridiculous. To avoid that you need to set the interpreter equal to none

title(imageFileName, 'Interpreter', 'none');

[Star Strider]

Good point. ‘Axis Properties’ doesn’t have in 'Interpreter' option.

[Aravin]

Dear Strider,

Thank you for your reply. It works well for given example. I want exactly that but when I use it for my real problem where i have 5 xtick values then it gives error that x y should have same dimensions. Could you please modify it so that I can use it.

Example:

J = [1 2 3;4 5 6;7 8 9;10 11 12;13 14 15];

bar(J);
set(gca,'XTickLabel','');
set(gca, 'XTickLabelMode','manual')
hxt = get(gca, 'XTick')
ypos = min(ylim) - diff(ylim)*0.05;
text(hxt, [1 1]*ypos, {'F_0|F_1','F_0|F_2','F_0|F_3','F_0|F_4','F_0|F_5'}, 'HorizontalAlignment', 'center')

And how to make text italic (F_0|F_1) ?

[Aravin]

I have Figured it out. Thank you.

[Star Strider]

My pleasure!

GMT-6 here so I’m just now seeing your reply.

You need to use ‘ones(1,length(hxt))*ypos’ to make the x and y vectors equal for the ‘text’ statement, but you’ve already figured that out.

Answer 2

[dpb]

For some unfathomable reason, TMW has not implemented the TeX or LaTeX interpreter for axis labels so you'll have no joy that route.

set(gca,'xticklabel',[])   % hide the existing labels

then use

xt=get(gca,'xtick').';
text(xt,-0.2*ones(size(xt)),num2str(xt-1,'I_%d'), ...
     'horizontal','center')

(ADDENDUM--incorporate the horizontal alignment to center)

Salt to suit...

[Aravin]

Thank you.