Plotting to multiple GUI axes simultaneously using a for loop
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Hi,
I am trying to build a GUI to plot real-time data from an Arduino. The code needs to read the values in from four analog pins and plots the data on each of the 4 axes in the Matlab GUI, respectively. The code I have at the moment works, however it is rather slow. Can anyone provide a means to make this faster/remove inefficiencies or any other assistance would be helpful? The code is as follows:
x1=0;
x2=0;
x3=0;
x4=0;
for k=1:1:100
%plot 1
A1=readVoltage(a,'A1');
x1=[x1,A1];
plot(handles.axes1,x1,'LineWidth',2);
grid on;
drawnow;
%plot 2
A2=readVoltage(a,'A2');
x2=[x2,A2];
plot(handles.axes2,x2,'LineWidth',2);
grid on;
drawnow;
%plot 3
A3=readVoltage(a,'A3');
x3=[x3,A3];
plot(handles.axes3,x3,'LineWidth',2);
grid on;
drawnow;
%plot 4
A4=readVoltage(a,'A4');
x4=[x4,A4];
plot(handles.axes4,x4,'LineWidth',2);
grid on;
drawnow;
pause(0.01);
end
采纳的回答
x = zeros(4, 101); %Preallocation is much faster
Px = gObjects(1, 4);
for c = 1:4 %Initilize all your plots, for 4 pins
Px(c) = plot(handles.(['axes' num2str(c)]), 0, 'LineWidth', 2); %Store your plot handles
grid on;
end
for k = 2:101 %Did k to 101 since it looks like you want to keep the 1st point as a 0
for c = 1:4
x(c, k) = readVoltage(a, ['A' num2str(c)]);
set(Px(c), 'XData', 1:k, 'YData', x(c, 1:k)); %Setting the XData and YData directly to prevent redrawing plot from scrap.
end
drawnow; %Do only 1 drawnow, instead of 4 drawnow you had before
end
Note that instead of 4 plots, you could just have 1 plot with 4 lines for a little extra speed and simplicity in GUI.
4 个评论
TCull
2018-7-9
I see, matlab 2015a doesn't have string capabilities yet. In that case, you'll have to change things to
Px(c) = plot(handles.(['axes' num2str(c)]), [], 'LineWidth', 2)
and
x(c, k) = readVoltage(a, ['A' num2str(c)]);
I edited the answer above
TCull
2018-7-9
OCDER
2018-7-10
You're welcome!
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