text label above the bars

Hi there,

I am new in matlab and I am trying to put text labels above the bars, so that A is above first one, B above second one etc...Can you help me with this

thank you

R

y = [10,20,30,15];

a = bar(y);

labels = {'A', 'B', 'C', 'D'};

Answer 1

[Star Strider]

This works:

y = [10,20,30,15];

a = bar(y);

labels = {'A', 'B', 'C', 'D'};

xt = get(gca, 'XTick');
text(xt, y, labels, 'HorizontalAlignment','center', 'VerticalAlignment','bottom')

[Rene Sebena]

nice :) thank you very much, this help me a lot!

but I just find out that my task is a little bit more complicated.. I have data from several subjects and 4 exp. conditions eg: y = [10 15, 20 15,30 15,15 12];

a = bar(y);

and I have to put string labels above each subjects bar (for the same subject bar always the same label, so above 10, 20, 30 and 15 I have to put for example A and above 15,15,15 and 12 label B). Have can I solve this issue?? Thank you.

[Star Strider]

My pleasure!

[Image Analyst]

Rene:

You can use sprintf() to create any string you want. Then just use text() to place that string in the desired location.

[Star Strider]

@Rene Sebena —

It’s one step more complicated than that. You have to split the string created by sprintf into a cell array of strings.

I’m lost as to what you’re asking. This will do what I believe you asked for, but you will have to experiment with it, since I’m not clear on what you want:

y = [10,20,30,15];

a = bar(y);

labels = {'A', 'B', 'C', 'D'};
nrs = [10, 20, 30, 15; 15, 15, 15, 12];                         % Y-Coordinates For Each Set Of Bars
for k1 = 1:2
    lblstr{k1} = sprintf([labels{k1} ' %.0f\n'], nrs(k1,:));    % Labels For Bars
end

xt = get(gca, 'XTick');
for k1 = 1:1                                                    % Increase This To ‘1:2’ For The Second Set Of Bars
    labels = regexp(lblstr{k1}, '\n', 'split');
    text(xt, y, labels(1:end-1), 'HorizontalAlignment','center', 'VerticalAlignment','bottom')
end

[Image Analyst]

Rene, to do what you asked last, you don't even need to mess with sprintf() or cell arrays. Just do this:

y = [10 15, 20 15,30 15,15 12];
a = bar(y);
xt = get(gca, 'XTick');
for k1 = 1:length(y) 
  if rem(k1,2) == 1
    thisLabel = 'A'
  else
    thisLabel = 'B'
  end
        text(xt(k1), y(k1), thisLabel, ...
    'FontSize', 20,...
    'HorizontalAlignment','center', ...
    'VerticalAlignment','bottom')
end
grid on;

[Rene Sebena]

Thank you for this, this is almost what I need, is there such an elegant solution for this kind of graph?

y = [10 15; 20 15;30 15;15 12];

I need to put A above each first bar(blue) of the group and B on the second ones(red).

My fault I did not explain it correctly at the beginning. Sorry for that.

[Image Analyst]

You've never mentioned anything about red or blue before. What is read and blue - the text or the bars or both? And what is the "second one of the group"? I see just one group of 8 bars and they're all blue.

When you said "so above 10, 20, 30 and 15 I have to put for example A and above 15,15,15 and 12 label B" it seemed to us that you wanted bar #'s 1,3,5, and 7 to have an A above them, and bars 2,4,6, and 8 to have a B above them (at least that was a guess on my part that matched what you said). Now you've made it confusing again.

[Rene Sebena]

Yes, my fault, sorry for that, I have groups of bars for several subjects and 4 experimental conditions,.. Subject1 results are [10,20,30,15] and subject2 results are [15,15,15,12] so the matrix is like this:

y = [10 15; 20 15;30 15; 15 12];

and I just need to label subject 1 results with eg. "A" and subject 2 results with label "B".