How to use the function 'fit' on array of data and create an array of 'fit objects'

Question

Eric Diaz 2015-4-16

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评论： Eric Diaz 2015-4-17

The 'fit' function does not seem to be friendly with arrays / matrices / variables.

for ii = 1:size(Y,2)
fitVar(ii)=fit(X,Y(:,ii),'exp1');
end

returns

Error using cfit/subsasgn (line 7)
Can't assign to an empty FIT.

while

for ii = 1:size(Y,2)
fit(X,Y(:,ii),'exp1');
end

works fine.

However, I can't do

fit(X,Y,'exp1')

if X is a dependent vector [10 x 1] which and Y is an independent matrix [10 x nSamples].

What is the solution?

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Answer 1

Philip Caplan 2015-4-17

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在 MATLAB Online 中打开

Hi Eric - you cannot have arrays of "cfit" or "sfit" objects, which is the type returned by "fit". As such, you cannot index into this array because MATLAB thinks you are assigning (via subscripting) to an empty fit object. Instead, you can hold your "fit" objects in a cell array. The only change you need to make to your code is to use curly braces {} to index into "fitVar":

for ii = 1:size(Y,2)
    fitVar{ii} = fit(X,Y(:,ii),'exp1');
end

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Eric Diaz 2015-4-17

Thank you for you're reply. This only partially solves the problem. Is there no way for "cfit" or "sfit" "fit" family of functions to do perform their job on matrices? Like other linear algebra matrix functions in MATLAB?

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