MATLAB: Can I plot 3 variables in 2d figure

3d plotsplotting

hello, the problem is that I have 3 variables, velocity(v), acceleration (a), and speed (s) -speed is scalar, velocity is vector. SO i need to plot them on 2d figure. is that possible in matlab? I try this but don't know how to finish

k=0;
v=... (vector of 1 by 10, -ve and +ve)
s=abs(v);
for t=0:0.289:2.9
k=k+1;
a(k)=v(k)./t;
end
plot(v,a) % only  2d i dont know how to add s

Best Answer

Use plot3() or scatter3().

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MATLAB: Cannot plot iterations.

clear all ; clc; 
t=20:30;%range of inital velocities plotted 
dt = min(diff(t)) ; 
g = 9.81 ; 
figure;
hold on
for i=20:30       %to iterate through a few intial velocities.
    v0=i;
    v(1)=v0;
    s(1)=0;
    
for k=2:length(t)  %This loop uses eulers formula to calculate velocity and displacment
    muk=0.7;
    a=-muk*g;
    dvdt=a;         %acceleration
    dsdt = v(k-1);  %velocity = displacment over time
    
    %approx value of v at current step given previous value
    v(k) = v(k-1) + dvdt*dt;
    
    %approx value of s at current step given previous value
    s(k)=s(k-1)+dsdt*dt; 
    
    %Break loop when velocity starts to become negative 
    if v(k) < 0 
        break
    end
end
%Value before the first negative velocity value (this is the time where 
%the car has stopped). 
v(k-1)       %this iterates through initial velocities corresponding to the final positive velocity value in each case
%plotting
plot(t,v(k-1),'*')   
end

MATLAB: How, using a for loop, can I create an array

how using a for loop

V and A are overwritten for every iteration of the loop. Try this

vec = [.25:.25:4];
len = length( vec );
A = nan( len, 1 );
V = nan( len, 1 );
for jj = 1 :  len
    a = vec(jj);
    V(jj) = (.25*pi^2).*(a+b)*(b-a).^2 %equation for Volume
    A(jj) = pi^2*(b^2-a.^2) %equation for Area
end
plot(V,A) %plot Volume vs. Area

Best Answer

Related Solutions

MATLAB: Cannot plot iterations.

MATLAB: How, using a for loop, can I create an array

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