Why isn't min working for me?

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Sarah Washington
Sarah Washington 2011-12-15
I have been trying the examples from the documentation but those don't even work. I keep getting the error that index exceeds matrix dimensions. Does anyone know what I should do?
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the cyclist
the cyclist 2011-12-15
It is pretty difficult to diagnose your problem when you don't provide any code. Can you edit your question to include a small snippet that gives the error?

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回答（2 个）

the cyclist
the cyclist 2011-12-15
Did you accidentally define a variable called "min", and it is now being used as a variable rather than a function? For example:
min = 0; % Bad coding! Don't use keyword as variable name!
min([6 3])
will give such an error.
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Jan
Jan 2011-12-15
@the cyclist: Small correction: "min" is not a _keyword_, but a toolbox function. See "help iskeyword" and "edit iskeyword". But the argument is correct inspite of this term. +1

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Avishek
Avishek 2011-12-15
be sure to use this lines of codes in all script files that u write
clear all% to clear all the variables
clc; % clear command
*suppose *
a= [1 2 3 4 5 6 7];
min_a=min(a);
% if b is a matrix
b=[1 2 3 4; 2 3 4 5;]
min_b= min(b(:));
% b(:) this command transforms b into a vector from a matrix
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Chandra Kurniawan
Chandra Kurniawan 2011-12-15
About the "clear all": http://www.mathworks.com/matlabcentral/answers/16484-good-programming-practice#answer_22301
Walter Roberson
Walter Roberson 2011-12-15
Avishek, you are using "clear all" without understanding what it does. Once you know what it really does, you will likely find that good uses for it are quite rare.
If you are calling a script file from the command line or from a script file, then chances are that you have created some variables already that you do not want to erase.
If you are calling a script file from a function, if you have "clear all" then everything in the function workspace (and much more!) will be deleted, which is going to cause problems for the function.
Using "clear all" from a script makes your script unusable as a utility routine to do some work, discouraging the important practice of code re-use.
With regards to space issues: when you are writing a script or function that uses variables of more than trivial size, you should get in the habit of "clear" of the individual variables once your code is finished with them.

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