How to plot 3 different values in single plot in real time.

Question

Chandra Shekhar 2013-2-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/63592-how-to-plot-3-different-values-in-single-plot-in-real-time

Here i need to read data from serial port, for plotting ECG waveform in real time. From that serial data, i need to create 2 more values. like serial data=x

1st value=x; 2nd value=x-50; 3rd value=x-20;

so for these 3 values i need to add different colors ('r','g','b') in single plot that to in real time.

In below code i can able to receive one value from serial port and plotted in real time.

 obj = serial('COM1','BaudRate',9600); %creating the object
fopen(obj); %open port
set(obj,'terminator','cr') %providing the terminator
a1=0; % a variable for y axis
time1=now; % time is in x axis
liH=line(NaN,NaN); 
while 1 % infinite loop
    time2=now;
    x=[time1 time2];
    ip_data = fscanf(obj); 
    a2= str2num(ip_data) ;
    a=[a1 a2];
    line(x,a);
    set(liH,'XData',[get(liH,'XData') x]);
    set(liH,'YData',[get(liH,'YData') a]);
    datetick('x','HH:MM') %change the axis
%   pause(0.5);
    a1=a2;
    time1=time2;
end
delete(instrfindall)

Here i am plotting correctly for single value, then how to change colors of each value and how to plot 3 different values in single plot.

Any suggestions please..?

Thank You

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Cedric 2013-2-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/63592-how-to-plot-3-different-values-in-single-plot-in-real-time#answer_75276

编辑：Cedric 2013-2-16

在 MATLAB Online 中打开

Using hold on allows you to plot consecutively on the same figure without erasing the previous content. E.g.

 figure(1) ;
 clf ;
 hold on ;
 plot(sin(0:.1:10), 'r') ;
 plot(cos(0:.1:10), 'g') ;

I don't fully understand why you want to change the color for each line, but you can do this using the ColorSpec parameter, generating the RGB triple with some mathematical function of your own:

line([0, 100], [-1, 1], 'Color', [1,0.4,0]) ;

3 个评论
显示 1更早的评论隐藏 1更早的评论

Cedric 2013-2-16

编辑：Cedric 2013-2-16

在 MATLAB Online 中打开

Keeping your approach and notation, you would have to have your code start with

 figure(1) ;
 clf ;
 hold on ;

and then in the loop, replace the line(x,a) call with e.g.

 line(x, a, 'b') ;
 line(x, a+50, 'r') ;
 line(x, a-10, 'g') ;

Chandra Shekhar 2013-2-19

Thank You Cedric, now i got it.

请先登录，再进行评论。

How to plot 3 different values in single plot in real time.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

3 个评论
显示 1更早的评论隐藏 1更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

Community Treasure Hunt

How to plot 3 different values in single plot in real time.

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

3 个评论 显示 1更早的评论隐藏 1更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

Community Treasure Hunt

WeChat

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

3 个评论
显示 1更早的评论隐藏 1更早的评论