2016b fitlm giving me error "Undefined function or variable 'istall'."

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Angelo (Scotty) Gilmore
Angelo (Scotty) Gilmore on 29 Sep 2016
Answered: Abhinav Gaur on 26 Jul 2017
I recently upgraded to MatLab 2016b, and a script that worked fine in 2016a is now giving me issues. In particular, fitlm(x,y) is giving me the error "Undefined function or variable 'istall'." Thanks in advance.
% CODE
x = [1 2 3 4 5 6 7 8 9 10];
y = [1 4 9 16 25 36 48 64 91 99];
test = fitlm(x,y);
% OUTPUT
Undefined function or variable 'istall'.
Error in classreg.regr.TermsRegression.createFormula (line 621)
isTall = istall(X);
Error in LinearModel.createFormula (line 1367)
formula = classreg.regr.TermsRegression.createFormula(supplied,modelDef, ...
Error in LinearModel.fit (line 1203)
model.Formula = LinearModel.createFormula(supplied,modelDef,X, ...
Error in fitlm (line 117)
model = LinearModel.fit(X,varargin{:});
  2 Comments
Matthias
Matthias on 17 Oct 2016
I have the same problem (istall not found).
>> ver('matlab')
----------------------------------------------------------------------------------------------------
MATLAB Version: 9.1.0.441655 (R2016b)
MATLAB License Number: ••••••
Operating System: Microsoft Windows 7 Professional Version 6.1 (Build 7601: Service Pack 1)
Java Version: Java 1.7.0_60-b19 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
----------------------------------------------------------------------------------------------------
MATLAB Version 9.1 (R2016b)
>> which -all istall
'istall' not found.
>> which -all fitlm
C:\Program Files\MATLAB\R2016b\toolbox\stats\classreg\fitlm.m
Edit: Very dirty workaround (works if you're not working with tall arrays): Add this function to your path:
function out = istall(varargin)
out = false;

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Answers (2)

michio
michio on 17 Oct 2016
Edited: michio on 20 Oct 2016
Hmm I could not reproduce your issues. One possibility is that the error comes due to corrupt path or installation. Have you tried restore your path settings? If no, it's worth a try.
If it allows please follow the steps below to restore search path to its factory-installed state.
1. Execute the commands:
restoredefaultpath
rehash toolboxcache
2. Execute your code:
x = [1 2 3 4 5 6 7 8 9 10];
y = [1 4 9 16 25 36 48 64 91 99];
test = fitlm(x,y);
If this works fine, then execute the following command to save the path
savepath
  1 Comment
Kojiro Saito
Kojiro Saito on 18 Oct 2016
istall is a MATLAB function introduced in R2016b.
If you installed successfully and the path is correct, it should be located in
matlabInstallDir\toolbox\matlab\bigdata\istall.m

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Abhinav Gaur
Abhinav Gaur on 26 Jul 2017
In my case, as @Kojiro suggested, the file
'istall.m'
did exist in the directory
'matlabInstallDir\toolbox\matlab\bigdata'
I added it manually using 'addpath()' and now fitglm works for me.

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