function min

2012 2 28
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3 次查看（30 天）

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How to see the code(algorithm) of function "min" in MATLAB???
Thanks

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回答（2 个）

Sean de Wolski
Sean de Wolski 2012-2-28

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Aldin
Aldin 2012-2-28
Seand de Wolski, what is this link useful for :) ? Did you get a job offer :)?
Sean de Wolski
Sean de Wolski 2012-2-28
If you want to see the code for min(), you need to work here!
The first step is to apply, we encourage you and everyone who thinks they might be a good fit for a career at MathWorks, to do so!
Aldin
Aldin 2012-2-28
Sean, do you think i have a chance for career at MathWorks. Surely, i know the implementation for min function but i wondering me for implementation of solve, diff and so on.
For example
>> solve(x^100 + 5*x^8 + x + 0.9); awesome :)
Aldin
Aldin 2012-2-28
What i have to know if i would like to work for you?
Walter Roberson
Walter Roberson 2012-2-28
The symbolic toolbox solve() routine has many many parts to it, a major programming effort, as it has to deal with a large number of different functions -- it is _not_ restricted to polynomials.
Generally speaking, roots of polynomials are usually found in symbolic packages by looking for Groebner Basis. (Unfortunately I never did figure out what a Groebner Basis _is_ or how to find one...)

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Wayne King
Wayne King 2012-2-28

1 个投票

Hi, you cannot. That is a built-in (compiled) function. The source code for the function and others like is not shipped with MATLAB.

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Aldin
Aldin 2012-2-28
also for other function in MATLAB?
Walter Roberson
Walter Roberson 2012-2-28
For any given function, say XYZ, you can command
type XYZ
at the command line.
The source will be shown if it exists. If all you see is comments and help text, then the _real_ source is not implemented in MATLAB.
Sean de Wolski
Sean de Wolski 2012-2-28
cool!
Aldin
Aldin 2012-2-28
??? Undefined function or variable 'XYZ'.
Walter Roberson
Walter Roberson 2012-2-28
type min
type solve
type diff
For the version I am using, the response is:
>> type min
'min' is a built-in function.
>> type solve
??? Error using ==> type
File 'solve' not found.
>> type diff
'diff' is a built-in function.
which is expected: min and diff are not implemented in the MATLAB language, and solve is part of a toolbox that I do not have.

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Aldin
Aldin
2012-2-28

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