MATLAB: Not getting direction field for an ode in a proper way.

direction field

Dear all

I am new at drwing th direction field for DE. I have drwn the direction field for DE: dy/dt=9.80.196y, but the figure i got, is very much different from the desired one. The arrows and the way they are appearing in this figure are not similar to which we see in a usal direction field picture.

I am posting he figures, which i got .

The code is:

y=0:1:80;
t=0:.1:8;
[Y,T]=meshgrid(y,t);
dy=9.8-0.196*y;
r=(dy.^2).^0.5;
u=dy./r;
quiver(t,y,1./r,u,.5);

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MATLAB: Error using * Inner matrix dimensions must agree – using meshplot

Will, use

 [t y] = meshgrid(0:0.5:2,-4:0.5:4); 
 dy    = t.^2.*exp(2*t) + 2.*y;   % need to use dot operators all the way
 dt    = ones(size(dy));
 L     = sqrt(1 + dy.^2); 
 quiver (t, y, dt./L, dy./L, 0.5)
 axis tight;

MATLAB: Help,, someone please, how to plot with this equation? what error in the coding, check please!!!

clear
clc
%n=2
syms z n
b=2*sin(2*pi*z)*sin(n*pi*z);
As=2*int(b,z,0,1) ;
y=0:1:10;
t=0:1:10;
[Y,T]=meshgrid(y,t);
u = zeros(size(Y)) ;
for n=1:1000
    n
    A = double(subs(As,n)) ;
    B=exp(-(1/10)*(n^2)*(pi^2).*T*sin(n*pi.*Y));
    %u=sum((A.*B), n=1..100);
    u=u+A.*B ;   
end
 surf(Y,T,u)

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Related Solutions

MATLAB: Error using * Inner matrix dimensions must agree – using meshplot

MATLAB: Help,, someone please, how to plot with this equation? what error in the coding, check please!!!

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