How to do simultaneous flickering of two straight line plots

Question

Marisa 2022-3-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1684074-how-to-do-simultaneous-flickering-of-two-straight-line-plots

评论： Marisa 2022-4-1

I have plotted a number 7 using two straight line plots.I want these lines to flicker for 5 seconds at different frequency but start simultaneously.I have done flickering at different frequency but in a sequential maaner.How can I achieve this flickering simultaneously?

This is my code

a=plot([6;9],[0.4;0.4],'linewidth',8,'color','green')

hold on

% t=text(0.5,0.5,'\leftarrow');

set(gca,'color',[0 0 0])

xlim([0 12])

ylim([-0.4 0.8])

b=plot([9;9],[-0.1 0.4],'linewidth',8,'color','green')

xlim([0 12])

ylim([-0.4 0.8])

t0=clock

while etime(clock,t0) <5

screensize = get( groot, 'Screensize' );

%for blinks=1:10

set(a,'visible','off')

pause(2)

set(a,'visible','on')

pause(2)

set(b,'visible','off')

pause(3)

set(b,'visible','on')

pause(3)

end

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Marisa 2022-4-1

Thank you .I got the flickering result but wanted it in a parallel manner so I used parfor instead of for and it gives the result directly without flickering.Please give me solution to this

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Answer 1

Simon Chan 2022-3-31

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1684074-how-to-do-simultaneous-flickering-of-two-straight-line-plots#answer_931024

在 MATLAB Online 中打开

flashing.m

Use function timer to set one timer for plot a and the other for plot b.

Attahced please find the function and you can run it to see whether this is what you want or not.

You may adjust the Period and TasksToExecute for different frequency and how many times you want to repeat,

u = 0; v=0;
t1 = timer('StartDelay', 1, 'Period', 0.25, 'TasksToExecute', 20, 'ExecutionMode', 'fixedRate');
t1.TimerFcn = @flashu;
t2 = timer('StartDelay', 1, 'Period', 0.25, 'TasksToExecute', 20, 'ExecutionMode', 'fixedRate');
t2.TimerFcn = @flashv;
function flashu(src,event)
    if mod(u,2)==0
        set(a,'visible','off')
    else
        set(a,'Visible','on');
    end
    u = u+1;
end
function flashv(src,event)
    if mod(v,2)==0
        set(b,'visible','off')
    else
        set(b,'Visible','on');
    end
    v = v+1;
end

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Answer 2

Mathieu NOE 2022-3-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1684074-how-to-do-simultaneous-flickering-of-two-straight-line-plots#answer_930459

在 MATLAB Online 中打开

hello Marissa

try this code

all the best

clc
clearvars
clf
figure(1)
a=plot([6;9],[0.4;0.4],'linewidth',8,'color','green');
hold on
% t=text(0.5,0.5,'\leftarrow');
set(gca,'color',[0 0 0])
xlim([0 12])
ylim([-0.4 0.8])
b=plot([9;9],[-0.1 0.4],'linewidth',8,'color','green');
xlim([0 12])
ylim([-0.4 0.8])
screensize = get( groot, 'Screensize' );
hold off
dt = 0.1;
t = (0:dt:5);
f1 = 1; % freq update for "a" plot (here 1 s off and 1 s on)
f2 = 2; % freq update for "b" plot (here 0.5 s off and 0.5 s on)
x1 = sin(pi*f1*t);
x2 = sin(pi*f2*t);
tic
    
for ci =1:length(t)
    pause(dt)
    if x1(ci)>=0
        set(a,'visible','off')  
    else
       set(a,'visible','on')
    end
    if x2(ci)>=0
        set(b,'visible','off')  
    else
       set(b,'visible','on')
    end
end
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