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

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{:});

[George]

Can you post the results of

which -all istall
which -all fitlm

[Matthias]

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;

Answer 1

[michio]

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

[Kojiro Saito]

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

Answer 2

[Abhinav Gaur]

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.