edit
% Modify expression to add input arguments.
% Example:
%   a = [1 2 3; 4 5 6]; 
%   foo(a);

derivada
??? Error: <a href="error:C:\Documents and Settings\a2009119663\My Documents\MATLAB\Q4\derivada.m,6,11">File: derivada.m Line: 6 Column: 11</a>
Unexpected MATLAB expression.

% Modify expression to add input arguments.
% Example:
%   a = [1 2 3; 4 5 6]; 
%   foo(a);

derivada
??? Input argument "y" is undefined.

Error in ==> <a href="error:C:\Documents and Settings\a2009119663\My Documents\MATLAB\Q4\derivada.m,4,0">derivada at 4</a>
dy(1)=y(2)*y(3)-t;

% Modify expression to add input arguments.
% Example:
%   a = [1 2 3; 4 5 6]; 
%   foo(a);

derivada
??? Input argument "y" is undefined.

Error in ==> <a href="error:C:\Documents and Settings\a2009119663\My Documents\MATLAB\Q4\derivada.m,4,0">derivada at 4</a>
dy(1)=y(2)*y(3)-t;

% Modify expression to add input arguments.
% Example:
%   a = [1 2 3; 4 5 6]; 
%   foo(a);

derivada
??? Input argument "y" is undefined.

Error in ==> <a href="error:C:\Documents and Settings\a2009119663\My Documents\MATLAB\Q4\derivada.m,5,0">derivada at 5</a>
dy(2)=-y(1)*y(3);

% Modify expression to add input arguments.
% Example:
%   a = [1 2 3; 4 5 6]; 
%   foo(a);

derivada
??? Undefined function or method 'y0' for input arguments of type 'double'.

Error in ==> <a href="error:C:\Documents and Settings\a2009119663\My Documents\MATLAB\Q4\derivada.m,5,0">derivada at 5</a>
dy(2)=-y0(1)*y0(3);

y=[10 0 0.8];
dy=[0 0 0];
dy(1)=y(2)*y(3)-t;
??? Undefined function or variable 't'.

t=[0 100];
dy=[0 0 0];
y=[10 0 0.8];
dy(1)=y(2)*y(3)-t;
???  In an assignment  A(I) = B, the number of elements in B and
 I must be the same.

t=0:0.1:100;
dy(1)=y(2)*y(3)-t;
???  In an assignment  A(I) = B, the number of elements in B and
 I must be the same.

dy(2)=-y(1)*y(3);
dy(3)=-0.5*y(1)*y(2);
dy

dy =

     0    -8     0

diary off
