# What is the difference between function and objective function in MATLAB ?

조회 수: 294(최근 30일)
Johan Johan 4 May 2018
편집: John D'Errico 4 May 2018
To know how to applicate the objective function for in a better way,
I want to find the difference between function and objective function, and what is the problems need to use the objective function ?

#### 댓글 수: 1

Stephen Cobeldick 4 May 2018
"What is the difference between function and objective function in MATLAB"
Nothing. An objective function is just a function being used in a particular way.

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### 채택된 답변

Torsten 4 May 2018
편집: Torsten 4 May 2018
No difference - "objective function" is just the terminus technicus for the function you want to maximize or mimimize in optimization problems.
Best wishes
Torsten.

#### 댓글 수: 3

Johan Johan 4 May 2018
But in objective function the function should accept a vector, whose length is the number of independent variables, and return a scalar,and other conditions if specify the type optimization problem. How these conditions help in a better solution of the problem?
Stephen Cobeldick 4 May 2018
"But in objective function the function should accept a vector, whose length is the number of independent variables, and return a scalar,and other conditions if specify the type optimization problem"
Functions can have many different kinds of inputs and outputs. Those are the requirements for a function if you want to use it as the objective function for some optimization routine.
John D'Errico 4 May 2018
An objective function ia still JUST A FUNCTION. That it is called an objective function is just a name. It is the function that an optimizer like fminunc will try to minimize, thus it provides the objective for the optimizer.
Shakespeare said it this way:
What's in a name? That which we call a rose By any other word would smell as sweet

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