Unable to perform assignment because the left and right sides have a different number of elements.

I`m new in this, but im trying to solve a problem with euler`s method and appears this as an error.

C=  100;
D=  0.1;
b=  0.15;
m=  0.05;
g=  9.81;
 
vo=0;
yo=0;
 
% Euler's Method
% Initial conditions and setup
h = 0.001;  % step size
x = 0.001:h:5;  % the range of x
y = zeros(size(x));  % allocate the result y
y(1) = 0;  % the initial y value
n = numel(y);  % the number of y values
% The loop to solve the DE
for i=1:n-1
    f = C*(dt/m)*(D-yo)-(g*dt)+(vo*(1-(b*dt)/m))
    y(i+1) = y(i) + h * f;
end
 
plot(x,y); grid on

COMMAND WINDOW

Unable to perform assignment because the left and right sides have a different number of elements.

Error in EulerMethod (line 20)

y(i+1) = y(i) + h * f;

[VBBV]

Without declaring dt , how did the program complete for loop. ?

i dont get any errors in command window after initalizing dt. see the figure attached

[KSSV]

Show us the wholde code....you will not get such error, when you run the give code.....

You have to define dt.....once you define dt..code runs smooth.