Community Profile # Isabel Chen

Active since 2015

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Suppose my spreadsheet data.xlsx has a column of strings: 'abc', 'def', 'ghi' Calling myTable = readtable(data.x...

6 years ago | 1 answer | 0

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Question

2016a Java error on startup
I run Matlab 2016a on Windows 7. It has worked fine for months, but recently started giving me this error message on startup: ...

6 years ago | 1 answer | 0

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Question

Index into a table using a vector of values
Suppose I have a table: T = var1 var2 a 1 b 2 c 2 d 3 e 4 f ...

6 years ago | 1 answer | 0

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Question

How to compute variance-covariance matrix inv(X'X) when X'X is rank-deficient? Does it make sense to use the pseudo-inverse as an estimate?
Suppose the design matrix X is rank deficient. Regression coefficients can be found based on the minimum-norm solution using the...

6 years ago | 1 answer | 1

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Question

Given a rank deficient design matrix, fitlm does not use pinv or lsqr to find the minimum norm solution. Why not?
A minimum norm solution can be found even if the design matrix is rank deficient. Why does fitlm not incorporate this? Is there ...

6 years ago | 2 answers | 1

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Add label to sub-axes in plotmatrix
Just in case anyone is interested, ylabel(AX(1,1),'str1') ylabel(AX(2,1),'str2') xlabel(AX(8,1),'str3') xlabel(AX(...

7 years ago | 8

| accepted

Question

Add label to sub-axes in plotmatrix
I am using the plotmatrix function and would like to label the sub-axes (along the major Y axis and X axis only, of course). I'v...

7 years ago | 2 answers | 2

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Question

Linear Regression: order of estimated coefficients does not match input order
For example, mdl = fitlm(data,'EXPOS ~ X1 + X2 + HEIGHT + AGE') The output mdl.Coefficients produces the estimat...

7 years ago | 1 answer | 0

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Error message when generating table from workspace variables
Oh goodness, thanks! This came up: >> whos table Name Size Bytes Class Attributes table ...

7 years ago | 0

Question

why does fitlm not provide prediction intervals?
fitlm provides 95% confidence intervals but not prediction intervals. Why? Is there an easy way to get prediction intervals?

7 years ago | 1 answer | 0