How to render a bar chart in descending order with x-axis label on each bar?

5 次查看（过去 30 天）
Andrew Holloway-Breward
回答： Andrew Holloway-Breward 2021-6-18
I just cannot fathom this out and wondered whether anybody could help before my PC exits the window!
I am trying to plot a bar chart with the values displayed in descending order and each bar has its label shown on the x-axis and nothing I've tried works.
My current code is this: -
clc;
clear;
T = readtable('data/car_insurance_claim_cleanse.csv');
target = table2array(T(:,26));
delCols = [1 3 24 26];
T(:,delCols) = [];
[idx, scores] = fscchi2(T, target);
varnames = T.Properties.VariableNames(idx);
labels = escapeLodash(varnames);
bar(labels, scores(idx));
xlabel('Rank');
ylabel('Score');
and this produces a bar chart like this: -
however as you can see the sequence of the bars is not in descending order?
If I change my code to: -
clc;
clear;
T = readtable('data/car_insurance_claim_cleanse.csv');
target = table2array(T(:,26));
delCols = [1 3 24 26];
T(:,delCols) = [];
[idx, scores] = fscchi2(T, target);
varnames = T.Properties.VariableNames(idx);
labels = escapeLodash(varnames);
bar(scores(idx));
xlabel('Rank');
ylabel('Score');
xticklabels(labels);
I get the columns in the correct sequence however my labels are missing from each bar?
escapeLodash just escapes the underscores for display purposes, but here's the code anyway: -
function r = escapeLodash(labels)
work1=cellstr(labels);
work2 = strrep(work1, '_', '\_');
r = nominal(work2);
end
Any ideas?

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采纳的回答

Andrew Holloway-Breward
Finally got there, this reordercats function is really confusing and totally intuitive!
clc;
clear;
T = readtable('data/car_insurance_claim_cleanse.csv');
target = table2array(T(:,26));
delCols = [1 3 24 26];
T(:,delCols) = [];
[idx, scores] = fscchi2(T, target);
varnames = T.Properties.VariableNames(idx);
labels = escapeLodash(varnames);
labels = reordercats(labels, string(labels));
bar(labels, scores(idx));
xlabel('Rank');
ylabel('Score');
this produces the chart as follows: -

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