add multiple lines to a single plot without using "hold on/off"

Question

cdlapoin 2021-9-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1457154-add-multiple-lines-to-a-single-plot-without-using-hold-on-off

评论： cdlapoin 2021-9-20

I have a function that creates two plots, I want to run that function in a for loop but have the plots updated with the new lines rather than create new plots. If I use hold on, then the two different types of plot will be on the same set of axis so I don't want that.

%% Create Plots

% Would like pressure dist overlaid on airfoil shape

tiledlayout(2,1);

ax1 = nexttile;

plot(x,y);

hold on;

for i=1:numPanels

p = [loc(i,1) loc(i,2); loc(i,1)-0.1*Cp(i)*normVect(i,1) loc(i,2)-0.1*Cp(i)*normVect(i,2)];

plot(p(:,1),p(:,2));

end

hold off

% plot CP dist below with same x-axis

ax2 = nexttile;

plot(loc(:,1),Cp);

linkaxes([ax1 ax2],'x');

set(ax2, 'YDIR','reverse');

so with this example code I would like the first plot to conitunally update ax1 on each itteration and the second to update ax2 for each itteration.

Thank you

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Stephen23 2021-9-20

The solution, just like all robust graphics, is to explicitly obtain and refer to all graphics objects via their handles.

As soon as you move beyond simple plotting one line in one figure, then you need to start working with handles:

https://www.mathworks.com/help/matlab/graphics-objects.html

cdlapoin 2021-9-20

Thanks, that is what I was looking for

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Answer 1

Walter Roberson 2021-9-20

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1457154-add-multiple-lines-to-a-single-plot-without-using-hold-on-off#answer_791549

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%% Create Plots
% Would like pressure dist overlaid on airfoil shape
tiledlayout(2,1);
ax1 = nexttile;
plot(ax1,x,y);
hold(ax1,'on');
for i=1:numPanels
    p = [loc(i,1) loc(i,2); loc(i,1)-0.1*Cp(i)*normVect(i,1) loc(i,2)-0.1*Cp(i)*normVect(i,2)];
    plot(ax1, p(:,1),p(:,2));
end
hold(ax1, 'off')
% plot CP dist below with same x-axis
ax2 = nexttile;
plot(ax2, loc(:,1), Cp);
linkaxes([ax1 ax2],'x');
set(ax2, 'YDIR','reverse');