# How to put any variable name automatically?

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Triveni on 7 Aug 2016
Commented: Walter Roberson on 8 Aug 2016
In this program,
a = 1 ;
b=2;
c = zeros(20,1);
d= zeros(20,1);
for k = 1:20
c(k) = (b+k)^2 + (a+k)^3;
d(k) = (b+k)^2 - (a+k)^3;
end
[maxobjective, iteration1] = max((c));
but i want to pre define objective function, means
[maxobjective, iteration1] = max((c)); or
[maxobjective, iteration1] = max((d));
put automatically like below.
objfun = c; %or d
a = 1 ;
b=2;
c = zeros(20,1);
d= zeros(20,1);
for k = 1:20
c(k) = (b+k)^2 + (a+k)^3;
d(k) = (b+k)^2 - (a+k)^3;
end
[maxobjective, iteration1] = max((objfun));

Walter Roberson on 7 Aug 2016
Use the same variable for both, but make it a cell array. And make objfun the index of the cell to use.
##### 2 CommentsShowHide 1 older comment
Walter Roberson on 8 Aug 2016
objfun = 1; %or 2
a = 1 ;
b=2;
c_d{1} = zeros(20,1);
c_d{2} = zeros(20,1);
for k = 1:20
c_d{1}(k) = (b+k)^2 + (a+k)^3;
c_d{2}(k) = (b+k)^2 - (a+k)^3;
end
[maxobjective, iteration1] = max(c_d{objfun});

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