saying that Index in position 2 exceeds array bounds (must not exceed 1) for line 7

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matlab
matlab 2020-9-30
评论： Star Strider 2020-10-8
data_2=data(:,1);
data_1=data(:,2);
data_=data(:,3);
stuff=data(:,4);
log= @(p,x) -(p(1)+p(2)*x(:,1)).*x(:,3).^p(3);
guess=[4 1]
log_model=fitnlm(data_2,data_,log,guess);
calc_log=feval(log_model,[data_2,data_1,data_]);
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回答（1 个）

Star Strider
Star Strider 2020-9-30
There are two problems that I can see.
First, ‘data_2’ is a column vector, so it does not have a second column, and ‘x’ must br a (Nx3) matrix, not a vector, or better than that, a (Nx2) matrix of the appropriate data vectors, and change the reference to ‘x(:,2)’. That is throwing an error where you refer to ‘x(:,3)’ in your (inappropriately-named) ‘log’ function. (Please name it something such as ‘log_model’ that does not overshadow a MATLAB function!)
Second, you are estimating 3 parameters, so ‘guess’ must have a value for each one of them. Right now, it only has values for 2.
Otherwise, this call:
log_model=fitnlm(data_2,data_,log,guess);
appears to be correct.
I cannot run your code, so there could be more problems that only running it could detect.

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