How to fill plot between two lines

Question

Fabian Moreno 2021-4-14

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/801426-how-to-fill-plot-between-two-lines

评论： Star Strider 2021-4-14

data1.mat

Hi there, I would like to know how to fill the area with one color (blues) if the area isabove the line and another color (red) if the area is under the line between two lines. I already make a code, but I couldn't fill the area under the line. I add my matrix in (.mat). I´m working with values in column five and six.Also I add my code and the image of what I get so far. Thank in advanced.

max=plot(data(:,1),data(:,5),'-k','LineWidth',3);grid on
xlim([data(1,1) data(365,1)]);
xticks([data(1) data(32) data(60) data(91) data(121) data(152) data(182) data(213) data(244) data(274) data(305) data(335)])
xticklabels({'Jan','Fev','Mar','Abr','Mai','Jun','Jul','Ago','Set','Out','Nov','Dez','Jan,20','Fev'})
ylabel('Accumulated precipitation [mm]')
xlabel('Month [daily data]')
hold on
min=plot(data(:,1),data(:,6),'-r');grid on
patch([max.XData, fliplr(min.XData)], [max.YData, fliplr(min.YData)], 'b')
hold off

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Answer 1

Star Strider 2021-4-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/801426-how-to-fill-plot-between-two-lines#answer_674526

在 MATLAB Online 中打开

If I understand the objective correctly, this should work:

DL = load('data1.mat');
data = DL.data;
max=plot(data(:,1),data(:,5),'-k','LineWidth',3);grid on
xlim([data(1,1) data(365,1)]);
xticks([data(1) data(32) data(60) data(91) data(121) data(152) data(182) data(213) data(244) data(274) data(305) data(335)])
xticklabels({'Jan','Fev','Mar','Abr','Mai','Jun','Jul','Ago','Set','Out','Nov','Dez','Jan,20','Fev'})
ylabel('Accumulated precipitation [mm]')
xlabel('Month [daily data]')
hold on
min=plot(data(:,1),data(:,6),'-r');
above = min.YData > max.YData;                                                                              % Logical Vector
patch([max.XData(above), fliplr(min.XData(above))], [max.YData(above), fliplr(min.YData(above))], 'b')      % Blue Area
patch([max.XData(~above), fliplr(min.XData(~above))], [max.YData(~above), fliplr(min.YData(~above))], 'r')  % Red Area
hold off
grid on

It adds a logical vector (‘above’), then uses that to colour the areas appropriately. The rest of the code is unchanged.

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Fabian Moreno 2021-4-14

编辑：Fabian Moreno 2021-4-14

在 MATLAB Online 中打开

Star Strider, I found why it didn´t fill red just the two areas under the line. It was because the two areas under the line become a kind of polygone and not recognized the two areas. Now, I divided the two areas and fill separated each one with red. Any way, thank you, now I understand a little bit more. :). I really aprecciated your help.

max=plot(data(:,1),data(:,5),'-k','LineWidth',3);grid on
xlim([data(1,1) data(365,1)]);
xticks([data(1) data(32) data(60) data(91) data(121) data(152) data(182) data(213) data(244) data(274) data(305) data(335)])
xticklabels({'Jan','Fev','Mar','Abr','Mai','Jun','Jul','Ago','Set','Out','Nov','Dez','Jan,20','Fev'})
ylabel('Precipitação acumulada [mm]')
xlabel('Meses [datos diários]')
hold on
min=plot(data(:,1),data(:,6),'-r');
above = find(data(:,5) > data(:,6)); % Logical Vector
above1= above(1:3,1); % here I divided the two areas 
above2= above(4:end,1);
patch([max.XData, fliplr(min.XData)], [max.YData, fliplr(min.YData)], 'b')      % Blue Area
patch([max.XData(above1), fliplr(min.XData(above1))], [max.YData(above1), fliplr(min.YData(above1))], 'r')  % Red Area
patch([max.XData(above2), fliplr(min.XData(above2))], [max.YData(above2), fliplr(min.YData(above2))], 'r') 