Format scientific decimal place bar plot

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Adi Purwandana
Adi Purwandana 2024-11-10
评论： Star Strider 2024-11-11
Hello there,
I want to make a data tip of the bar plot appeared in scientific format with one decimal place (example: 2.1x10^-3 instead of 0.0021). Anyone can help?
Here is my code so far, and please find the datasets attached:
load('data_c.mat');
x = unique_stations';
vals = [means_ep; means_kzo];
b = bar(x,vals);
set(gca,'yscale','log');grid on; box on;
xtips1 = b(1).XEndPoints;ytips1 = b(1).YEndPoints;
xtips2 = b(2).XEndPoints;ytips2 = b(2).YEndPoints;
labels1 = string(b(1).YData);labels2 = string(b(2).YData);
text(xtips1,ytips1,labels1,'HorizontalAlignment','center','VerticalAlignment','bottom') % should be adjusted here, I think
text(xtips2,ytips2,labels2,'HorizontalAlignment','center','VerticalAlignment','bottom') % should be adjusted here, I think
legend('mean e','mean kz');
I want this version:
Thank you!

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采纳的回答

Star Strider
Star Strider 2024-11-10
编辑：Star Strider 2024-11-10
Ran in:
I wrote some utility functions for just this purpose for my own use a few years ago.
Try this —
load('data_c.mat');
x = unique_stations';
vals = [means_ep; means_kzo];
b = bar(x,vals);
set(gca,'yscale','log');grid on; box on;
xtips1 = b(1).XEndPoints;ytips1 = b(1).YEndPoints;
xtips2 = b(2).XEndPoints;ytips2 = b(2).YEndPoints;
expstr = @(x) [x(:).*10.^ceil(-log10(abs(x(:)+(x==0)))) floor(log10(abs(x(:)+(x==0))))]; % Updated: 2021 05 04
% labels1 = string(b(1).YData);labels2 = string(b(2).YData)
labels1 = compose("%.1f\\times 10^{%d}", expstr(b(1).YData.'));
labels2 = compose("%.1f\\times 10^{%d}", expstr(b(2).YData.'));
text(xtips1,ytips1,labels1,'HorizontalAlignment','center','VerticalAlignment','bottom') % should be adjusted here, I think
text(xtips2,ytips2,labels2,'HorizontalAlignment','center','VerticalAlignment','bottom') % should be adjusted here, I think
legend('mean e','mean kz');
EDIT — Corrected typographical errors.
.
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更多回答（2 个）

Shashi Kiran
Shashi Kiran 2024-11-10
Hi @Adi Purwandana,
To display data tips in scientific notation with one decimal place on your bar plot, you can format the labels1 and labels2 variables by converting the YData values into strings with scientific notation.
In MATLAB, the "num2str" function can achieve this formatting. Here is how to adjust your code:
% Format labels in scientific notation with one decimal place using num2str
labels1 = num2str(b(1).YData', '%.1e'); % Transpose to column vector for num2str
labels2 = num2str(b(2).YData', '%.1e'); % Transpose to column vector for num2str
For more details about "num2str" refer to this documentation: https://www.mathworks.com/help/matlab/ref/num2str.html
Hope this helps.
Bruno Luong
Bruno Luong 2024-11-10
编辑：Bruno Luong 2024-11-10
Ran in:
load('data_c.mat');
x = unique_stations';
vals = [means_ep; means_kzo];
b = bar(x,vals);
set(gca,'yscale','log');grid on; box on;
xtips1 = b(1).XEndPoints;ytips1 = b(1).YEndPoints;
xtips2 = b(2).XEndPoints;ytips2 = b(2).YEndPoints;
labels1 = mystr(b(1).YData);labels2 = mystr(b(2).YData);
text(xtips1,ytips1,labels1,'HorizontalAlignment','center','VerticalAlignment','bottom') % should be adjusted here, I think
text(xtips2,ytips2,labels2,'HorizontalAlignment','center','VerticalAlignment','bottom') % should be adjusted here, I think
legend('mean e','mean kz');
function sc = mystr(a)
nd = floor(log10(a));
sc = arrayfun(@(x,n)sprintf('%1.1f x 10^{%d}',x,n), a./10.^nd, nd, 'unif', 0);
% EDIT: ADD CODE TO REMOVE EXPONENT WHEN IT IS EQUAL TO 1
sc = strrep(sc, ' x 10^{0}','');
end

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