How to pass additional inputs to function in 'fminbnd'?
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Abhinav
am 5 Feb. 2018
Bearbeitet: Stephen23
am 19 Mär. 2020
I have a function to optimize with respect to 'lambda':
function v = minfunction(lambda)
data = xlsread('data.xlsx');
data = data(:,2:3);
idx = xlsread('idx.xlsx');
v = 0;
for i = 1:size(idx,1)
v = v + max(0,(lambda*data(idx(i,1),1)+(1-lambda)*data(idx(i,1),2)-(lambda*data(idx(i,2),1)+(1-lambda)*data(idx(i,2),2))));
end
end
The optimization is of following form
lambda = fminbnd(@minfunction,0,1)
However, the function 'minfunction' asks for other arguments 'data' and 'idx'. These matrices are updated after each iteration. Currently, I am using excel data to pass these arguments. But I want to pass arguments 'data' and 'idx' in the 'minfunction' it self. If I am writing
function v = minfunction(data,idx,lambda)
and calling the optimizer as
lambda = fminbnd(@minfunction,0,1)
the MATLAB is showing error as too many input arguments.
Can someone help me with this? I am attaching the excel files with question containing idx and data.
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Stephen23
am 5 Feb. 2018
Bearbeitet: Stephen23
am 19 Mär. 2020
Do NOT call xlsread inside the function! Doing so will result in slow and inefficient code due to repeated file access.
The proper solution to your question is to define your function with as many arguments as you require:
function v = minfunction(data,idx,lambda)
idx = ...
lam = ...
v = fminbnd(@(t)minfunction(t,idx,lam), 0, 1);
Using this method the values of idx and lam are defined just once, and are then used for all iterations of the optimizer. You can read more this method by reading the MATLAB documentation:
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