How can I configure , so that MATLAB will not allow duplicate built in function by re-definition ?

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M.K.H. CHANDAN
M.K.H. CHANDAN 2013-2-7
编辑： M.K.H. CHANDAN 2015-11-19
MATLAB(7.5.0) has some built in functions when some body is Overwriting it by another defination in Matlab Command Window, it is allowing and meaning is changing, Somecases it is giving absurd result & some cases it is giving errors for Overwrite.
for Example:
>> M = magic(3)
M =
8 1 6
3 5 7
4 9 2
>> result = -det(M)
result =
360
>> det =1
det =
1
>> result= -det(M)
??? Index exceeds matrix dimensions.
MATLAB(7.5.0) has some built in functions when some body is Overwriting it by another defination in Matlab Command Window, it is allowing and meaning is changing, Somecases it is giving absurd result & some cases it is giving errors for Overwrite.

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采纳的回答

Image Analyst
Image Analyst 2013-2-7
I don't know that you can prevent it. Sometimes (rarely) this is exactly what you do want to do. You can make a habit of doing a dependency report and looking it over to see anything that looks like it might be using the wrong function.

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-2-7
编辑：Azzi Abdelmalek 2013-2-7
det is a Matlab function. when you do
det=1
you are creating a new variable det, and shadows the function det. To restore it
clear det
det(M)
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M.K.H. CHANDAN
M.K.H. CHANDAN 2013-6-26
编辑：M.K.H. CHANDAN 2015-5-18
yes , not only built in , for user defined function also we are getting same result. Yes, Nobody likes to shadows his own code/variable/function but in a system development a programmer might be defining a user defined function name<xyz> can be changed by another programmer working on same systems by variable name xyz and at the same time the functionality of the function will never work.
So I think it should not be allowed from the compiler itself to the programmer/user.

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