how can i animate the line using for loop and if statement

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close all

clc

h = animatedline;

axis([1 4 1 4])

for x=1:4

if x==1

y(x)=1;

elseif x==2

y(x)=1;

elseif x==3

y(x)=2;

elseif x==4

y(x)=1;

elseif x>4

break;

addpoints(h,x(x),y(x));

drawnow

x=1:4;

end

end

I want the line should be move slowly through these points, please help me to fix this.

Answer 1

[Mathieu NOE]

hello

you can do much simpler , as x and y are fully defined in the initialization section , then you only have to loop - four times and that's it ! no need for if elseif statements

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clc

figure
h = animatedline;
axis([0 5 0 5])

x=1:4;
y = [1 1 2 1];

for ci=1:4

        addpoints(h,x(ci),y(ci));
        pause(0.5);
        drawnow
        
end
    

.

[Rajawarman Thiruselvam]

thank you so much!! now i want that line moves smoothier, how can i do that?? and marker leds the line will be fine.

[Mathieu NOE]

something like that ?

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clc

figure
h = animatedline;
h.Marker = '*';
axis([0 5 0 5])

x=1:4;
n = 100;
xx=linspace(x(1),x(end),n);
y = [1 1 2 1];
yy = interp1(x,y,xx);


for ci=1:n

        addpoints(h,xx(ci),yy(ci));
        pause(0.1);
        drawnow
        
end

[Rajawarman Thiruselvam]

nice, now the line is smooth

can you please explain this??

n = 100;

xx=linspace(x(1),x(end),n);

y = [1 1 2 1];

yy = interp1(x,y,xx);

[Rajawarman Thiruselvam]

one last question please

if i have an another 4 data points which is x=1:4, y=[2 2 3 2] now, i want to create another animated line in same plot, how can i do this??

[Mathieu NOE]

to the first question, I repalced the iteration from only 4 steps to n = 100 steps.

so this will give you the more progressive dispaly with 100 points per line and not only 4

to do so, I interpolated from the original y data to 100 evenly spaced x values

to the second question, simply do the same for a second animatedline object :

clear all
close all
clc

figure
h1 = animatedline;
h1.Marker = '*';
h2 = animatedline;
h2.Marker = '+';

axis([0 5 0 5])

x1=1:4;

n = 100;
xx1=linspace(x1(1),x1(end),n);
y1 = [1 1 2 1];
y2 = [2 2 3 2]; 
yy1 = interp1(x1,y1,xx1);
yy2 = interp1(x1,y2,xx1);


for ci=1:n

        addpoints(h1,xx1(ci),yy1(ci));
        addpoints(h2,xx1(ci),yy2(ci));
        pause(0.1);
        drawnow
        
end
    

[Rajawarman Thiruselvam]

Thank you! how can i change the colors of these lines except red,blue, green

for example i want orange and dark green or some other colors. how can i do this??

[Mathieu NOE]

hello

see

Color specification - MATLAB ColorSpec (Color Specification) - MathWorks France

code updated for orange and green colors

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clc

figure
h1 = animatedline;
h1.Marker = '*';
h1.Color = [1 0.4 0]; % orange
h2 = animatedline;
h2.Marker = '+';
h2.Color = [0 1 0]; % green

axis([0 5 0 5])

x1=1:4;

n = 100;
xx1=linspace(x1(1),x1(end),n);
y1 = [1 1 2 1];
y2 = [2 2 3 2]; 
yy1 = interp1(x1,y1,xx1);
yy2 = interp1(x1,y2,xx1);


for ci=1:n

        addpoints(h1,xx1(ci),yy1(ci));
        addpoints(h2,xx1(ci),yy2(ci));
        pause(0.1);
        drawnow
        
end