how to store a changing variable matrix with the same name

Question

Bou 2014-2-19

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评论： Jos (10584) 2014-2-19

Hello,

I have a row (1x8) of variables named Pars. The variables of Pars are changed by a function (fminsearch). I want to save Pars into another matrix each time one of the variables is changed. I've tried to use an output-function within fminsearch but this doesnt work.

However, within my minimization function (the function that fminsearch tries to minimize) I can write display(Pars) and the variables of Pars are displayed each time one of them is changed. I want to store the displayed variables in a matrix so each time one of the variables is changed they are stored in a new row.

I've tried something like this (this was recommended by someone) but it doesnt work. I also want to save the data to the workspace.

data(1:length(Pars), and+1)=Pars

Can anyone help me? Thanks in advance!

greetings Boudewijn

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Answer 1

Jos (10584) 2014-2-19

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Something like this?

data = nan(0,8)
pars = fminsearch(...)
if IsChanged(pars),
  data(end+1,:) = pars ;
end

IsChanged is a function (or expression) that you have to define yourself.

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Jos (10584) 2014-2-19

btw your pars is a row vector with 8 columns, but your expression " data(1:length(Pars), end+1)=Pars " suggests that you want to store it as the last column. This does not add up ...

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