Why did I receive this error with inline

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Hassan
Hassan 2012-7-5
I have an inline object defined in the following manner (Part of code):
for o= 1 : 6
f = inline('min(x.+d(o,5),-x.+d(o,3))');
%%where d is a matix
.
.
for k= 1 : 3
.
.
val (k)=f(Pbest (k,1));
end
end
Error using inline/subsref (line 13)
Not enough inputs to inline function.

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回答（3 个）

the cyclist
the cyclist 2012-7-5
The way you have defined you inline function, it is going to contain the variable o, rather than replacing it with the loop's value of o.
I think what you want instead is this:
f = inline(['min(x.+d(',num2str(o),',5),-x.+d(',num2str(o),',3))'])
Also, o is a terrible name for a variable. ;-)
Honglei Chen
Honglei Chen 2012-7-5
编辑：Honglei Chen 2012-7-5
I see several issues:
  1. You should use + instead of .+
  2. The error is due to the fact that there are three variable in your function: x,d, and o. You should define them. As is, MATLAB thinks that d is a function but then there should be two inputs and you invoked it with only one input.
Below is a working example:
f = inline('min(x+d(o,3),-x+d(o,3))','x','o','d')
f(1,2,magic(5))
Star Strider
Star Strider 2012-7-5
First, you only need to define your 'inline' function once, ideally near the beginning of your code. Put it before your loop.
Second, it needs to know what you want it to do, so you have to specify your arguments to it:
f = inline('min(x+d(o,5), -x+d(o,3))', 'x', 'd', 'o');
I have no idea what you want to do with your 'val(k) = ...' assignment, since it doesn't seem to match what you want 'f' to do.
Third, in my experience, it's not necessary to use the '.' operator with '+' and '-' since they operate element-wise anyway. It's only necessary to use it with '*', '/', and '^'.

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