Using erfcinv and array indices are being rejected as not positive or valid, despite all being positive in the vector

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Gregory Lang 2024-10-3

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评论： Torsten 2024-10-3

Hello, I am currently working on some research data analysis and have been trying to fit autocorrelated data to a plot with a 95% confidence interval to check the distribution of the residuals. To do this, I'm working from the mathworks autocorrelation page (https://www.mathworks.com/help/signal/ug/residual-analysis-with-autocorrelation.html). When trying to set the confidence interval, I get the error that all array indices must be positive or logical values. Below is the code that I'm using, as well as residual data set.

erfbatp = erfcinv(a.Residuals.Raw);
erfbatp = erfbatp';
erfbatp = erfbatp(~isnan(erfbatp))';
conf99batp = sqrt(2)*erfbatp(2*.05/2);
lconfbatp = -conf99batp/sqrt(length(a.Residuals.Raw));
upconfbatp = conf99batp/sqrt(length(a.Residuals.Raw));

1.52973772211594

1.58151023710729

1.53641175549635

1.68852456597857

1.36494692501592

2.07737261195390

1.50753906916397

2.02256675790035

1.05155195289689

1.40278856349961

2.16079514557325

1.43199717380622

1.48556496430640

1.42827621898581

1.62133741215299

1.34671652045243

1.62813386205574

1.41104099011439

1.50196551118339

1.34604336518968

1.47733944833881

1.19896422993831

1.72322100428785

Above is the residual values in the erfbatp variable after removing NaNs, any advice or information would be appreciated.

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Answer 1

Torsten 2024-10-3

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https://ww2.mathworks.cn/matlabcentral/answers/2157265-using-erfcinv-and-array-indices-are-being-rejected-as-not-positive-or-valid-despite-all-being-posit#answer_1526450

编辑：Torsten 2024-10-3

As far as I understand, "erfbatp" is an array of numbers.

So erfbatp(2*.05/2) = erfbatp(0.05) does not make sense, does it ? Valid array indices are 1,2,3,4,...

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Gregory Lang 2024-10-3

Hello, thanks for the help. It seems that it was a missing multiplication sign. I'll flag the error on the mathworks site

Torsten 2024-10-3

在 MATLAB Online 中打开

I don't see it is used on the MATLAB site this way. I could only find

conf99 = sqrt(2)*erfcinv(2*.01/2);
lconf = -conf99/sqrt(length(x));
upconf = conf99/sqrt(length(x));

which looks correct.

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Using erfcinv and array indices are being rejected as not positive or valid, despite all being positive in the vector

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Using erfcinv and array indices are being rejected as not positive or valid, despite all being positive in the vector

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