Difference between revisions of "Symbolic package"

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(formatted example)
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[[Category:Octave-Forge]]
 
[[Category:Octave-Forge]]
  
Demo of Anonymous function to symbolic function and back to anonymous function
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=== Demos and usage examples ===
and then the use of the interval pkg.
 
  
% this is just a formula to start with
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* '''Demo of Anonymous function to symbolic function and back to anonymous function and then the use of the interval pkg.'''
  
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<source lang="octave">
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% this is just a formula to start with,
 
% have fun and change it if you want to.
 
% have fun and change it if you want to.
  
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     [-5.743488743719015, -5.743488743719013]
 
     [-5.743488743719015, -5.743488743719013]
 
     [-3.0962279604822407, -3.09622796048224]
 
     [-3.0962279604822407, -3.09622796048224]
  [-0.777688831121563, -0.7776888311215626]
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    [-0.777688831121563, -0.7776888311215626]
  [0.22911205809043574, 0.2291120580904359]
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    [0.22911205809043574, 0.2291120580904359]
 +
</source>

Revision as of 06:38, 29 June 2015

The symbolic package is part of the octave-forge project.

Demos and usage examples

  • Demo of Anonymous function to symbolic function and back to anonymous function and then the use of the interval pkg.
% this is just a formula to start with,
% have fun and change it if you want to.

f=@(x) x.^2 +3*x-1 + 5*x.*sin(x);

% the next 2 line take the Anonymous function into a symbolic formula

syms x;

ff=formula(f(x));

% now calculate the derivative of the function

ffd=diff(ff);

% and convert it back to an Anonymous function

df=function_handle(ffd)


% this uses the interval pkg. to find all the roots between -15 an 10 

fzero (f, infsup (-15, 10), df)

ans4×1 interval vector

    [-5.743488743719015, -5.743488743719013]
    [-3.0962279604822407, -3.09622796048224]
    [-0.777688831121563, -0.7776888311215626]
    [0.22911205809043574, 0.2291120580904359]