Issue in using splitapply to plot data

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vanrapa 2020-3-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/512428-issue-in-using-splitapply-to-plot-data

评论： Star Strider 2020-3-24

采纳的回答： Star Strider

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Hi,

I have an array with 14 columns. Column 3 contains groups of numbers. I would like to plot column 1 vs. column 4 for each group of column 3. I have written the following code,

G = findgroups(val(:, 3));
splitapply(@plot, val(:, 1), val(:, 4), G);

From my data, I should be getting 6 plots within the figure. But I am getting only a single plot. So what is the issue in my code?

Also how to write legend using splitapply?

Thanks.

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采纳的回答

Star Strider 2020-3-23

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/512428-issue-in-using-splitapply-to-plot-data#answer_421525

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One approach:

D = load('val.mat');
val = D.val;
G = findgroups(val(:, 3));
figure
hold on
Y = splitapply(@(x){plot(x(:,[1 4]))}, val, G);
hold off

Another approach:

D = load('val.mat');
val = D.val;
G = findgroups(val(:, 3));
Y = splitapply(@(x){x(:,[1 4])}, val, G);
figure
hold on
for k = 1:numel(Y)
    plot(Y{k})
end
hold off
grid
legend(compose('Group %d', 1:6), 'Location','eastoutside')