MATLAB: Graph plot always appears as a straight line

Curve Fitting ToolboxgraphgraphicsMATLAB C/C++ Graphics Library

Hi, I don't know how to fix this. y graph looks like a straight line instead of an exponential curve. Please help me.. thanks a lot in advance !

l=0.5;
i=22/7;
v=0.8;
p=0.1;
x=[0:0.2:1.0];
y=(p*r^4*x)/(8*v*l);
plot(x,y)

Best Answer

You are varying x, instead of r. The code below shows how you could edit your code to plot y as a function of r.

l=0.5;
i=22/7;
v=0.8;
p=0.1;
x=0.1;
n_r_steps=100;
r=linspace(0,1,n_r_steps);
y=(p*r.^4*x)/(8*v*l);
plot(r,y)

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Add the below two lines at the end of your code

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MATLAB: If x=[0:0.2:2]; and y=[-0.4:0.1:0.2]; and the equation of y=x/(x+r)-1/(1+r) and r is non linear it is many of curves and the values of r is r=0.1, 1, 10, 100 how can i plot it in matlab please help me i am trying many methods but still has a proble

Are you looking for this one? Considering y is finding function wrt x and r.

   x=0:0.2:2;
   %y=-0.4:0.1:0.2;
   r=[0.1 1 10 100];
   for i=1:4
   y=x./(x+r(i))-1/(1+r(i));
   plot(x,y);
   hold on;
   end
   legend('r=0.01','r=1','r=10','r=100');

Best Answer

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MATLAB: If x=[0:0.2:2]; and y=[-0.4:0.1:0.2]; and the equation of y=x/(x+r)-1/(1+r) and r is non linear it is many of curves and the values of r is r=0.1, 1, 10, 100 how can i plot it in matlab please help me i am trying many methods but still has a proble

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