Array index in symsum

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Crandel
Crandel 2016-8-23
评论： Crandel 2016-8-23
Hi,
I try to define this function
syms k;
error = @(c, r)symsum((abs(Data(k,:)-c)-r).^2,k,1,119);
Where Data is a 119x3 matrix, and c and r are 1x3. I get this error:
Error using sym/subsindex (line 737)
Invalid indexing or function definition. When defining a function, ensure that
the arguments are symbolic variables and the body of the function is a SYM
expression. When indexing, the input must be numeric, logical, or ':'.
I understand the error is in the index k of Data, but I don't know how to fix it.
Any one can help me?
Thanks

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采纳的回答

Walter Roberson
Walter Roberson 2016-8-23
Symbolic variables cannot be used as indices. You need to sum() definite values instead.
sum(abs(Data(1:119,:)-c)-r).^2)
You might need to use bsxfun() to get the right sizes of variables.

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