Can someone help me ?

Hello!

i want to plot a curve which the X axis is the time in second and the Y axis is the distance(m).

i have a vehicle runs with 20m/s through a distance of 1000 m but if it arrives at the end position , it will come back at the first position ,until finish a period T=3600s .

first of all the this vehicle should take 50s to arrive the final position.

so i have used the function "linspace"

X1=linspace(0,50,50) ;
Y1=linspace(0,1000,50);
plot(X1,Y1, 'LineWidth', 1.5), hold on ; 
X2= linspace(50,100,50);
Y2=linspace(980,20,50);
plot(X2,Y2, 'LineWidth', 1.5), hold on ; 
X3=linspace(100,150,50);
Y3=linspace(40,1000,50);
plot(X3,Y3, 'LineWidth', 1.5), hold on ; 
........

until arrive to T=3600s.

I am asking if there is an easier way than typing the command manually because I will repeat this for 72 times to get the whole period?

thanks in advance

[John D'Errico]

You cannot use a loop?

[Cedrik]

@John D'Errico Hi! i'm trying to user a loop but it doesn't work that i want

Answer 1

[David Hill]

figure;hold on;
x=linspace(0,50,50);
s=0;f=1000;
y=linspace(s,f,50);
plot(x,y,'LineWidth', 1.5);
for k=1:71
    x=x+50;
    s=s+20;
    if mod(k,2)==1
        y=linspace(f-s,s,50);%adjust, not sure about the pattern
    else
        y=linspace(s,1000,50);%adjust, not sure about the pattern
    end
    plot(x,y,'LineWidth', 1.5);
end

[Cedrik]

@David Hill thank you for your answer, but I did not get the required result, the curve is discontinuous.

after doing the plot, i will extract data (all positions through period T), so if there is a way to find data without plot i will use it.

[Image Analyst]

Try this:

figure;hold on;
x=linspace(0,50,50);
s=0;f=1000;
y=linspace(s,f,50);
plot(x,y,'LineWidth', 1.5);
allx = zeros(50 * 71, 1);
ally = zeros(50 * 71, 1);
for k=1:71
    x=x+50;
    s=s+20;
    if mod(k,2)==1
        y=linspace(f-s,s,50);%adjust, not sure about the pattern
    else
        y=linspace(s,1000,50);%adjust, not sure about the pattern
    end
    plot(x,y,'LineWidth', 1.5);
    drawnow;
    % Append to our master lists
    startingIndex = (k - 1) * 50 + 1;
    allx(startingIndex : startingIndex + 49) = x;
    ally(startingIndex : startingIndex + 49) = y;
end
grid on;

figure
plot(allx, ally)
grid on;