Bar chart legend and colour

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Megan 2020-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/506415-bar-chart-legend-and-colour

评论： Adam Danz 2020-2-19

I have created a bar chart and I want to add the names of the variants on the legend and they shoud have different colours.

How can I realize that?

ds = dataset("xlsfile", "dsCompact");
clean_ds = rmmissing(ds);
%% Mean of Mean of parameter variants for each velocity
[groupVariantsVelocity, variants, velocity, scale] = findgroups(clean_ds.parameter_variants, clean_ds.velocity, clean_ds.scale);
meanVariantsVelocity = splitapply(@mean, clean_ds.score, groupVariantsVelocity);
tVariantsVelocity = table (variants, velocity, scale, meanVariantsVelocity);
figure;
bar(meanVariantsVelocity(scale == "like"));

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Megan 2020-2-19

Hi Adam I have created a plot in paint what I am trying to do:

Megan 2020-2-19

dsCompact.xlsx

Sorry can you have a look at this data set?

It was the wrong one

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采纳的回答

Adam Danz 2020-2-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/506415-bar-chart-legend-and-colour#answer_416385

编辑：Adam Danz 2020-2-19

在 MATLAB Online 中打开

There are two approaches below. I recommend using the first one where the bars and labeled by the xtick labels. You can rotate them at any angle you wish. The second approach colors each bar and uses a colorbar to identify the color code. This requires a lot more work from the user to match the bar to the color. With a greater number of bars, the colors become too similar.

Also, consider reading the data in as a table instead of using datasets.

Use x tick labels

figure();
scaleSelection = strcmp(scale,'like'); % use strcmp(), not "==".
barData = meanVariantsVelocity(scaleSelection); 
bh = bar(barData);
% add x tick labels
ax = bh.Parent; 
ax.XTick = 1:numel(barData); 
ax.XTickLabel = variants(scaleSelection);
ax.TickLabelInterpreter = 'none'; 
xtickangle(ax, 45) % or try 90 degrees

Colored bars with colorbar as legend

This is not recommended.

figure();
scaleSelection = strcmp(scale,'like'); % use strcmp(), not "==".
barData = meanVariantsVelocity(scaleSelection); % use strcmp(), not "==".
bh = bar(barData);
% set bar color
bh.FaceColor = 'flat'; 
bh.CData = jet(numel(barData));  % use any colormap you'd like
% Add colorbar with categorical color labels
colormap(bh.CData)
cb = colorbar(); 
caxis([0,numel(barData)])
cb.YTick = 0.5 : 1 : numel(barData);
cb.TickLabels = variants(scaleSelection);
cb.TickLabelInterpreter = 'none'; 
cb.FontSize = 8; 
bh.Parent.Position(3) = 0.55;  % make the axis narrower to fit the colorbar labels.

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Megan 2020-2-19

I cant add a title.

Do you know why?

Adam Danz 2020-2-19

I'm not sure what that means.

When you run title('myTitle') or title(axisHandle, 'MyTitle'), do you get an error message? Does the title not appear? You'll need to be more descriptive.

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