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

### Angelo (Scotty) Gilmore (view profile)

on 29 Sep 2016
Latest activity Answered by Abhinav Gaur

### Abhinav Gaur (view profile)

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{:});
```

George

### George (view profile)

on 1 Oct 2016

Can you post the results of

```which -all istall
which -all fitlm
```
Matthias

### Matthias (view profile)

on 17 Oct 2016

```>> ver('matlab')
----------------------------------------------------------------------------------------------------
MATLAB Version: 9.1.0.441655 (R2016b)
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
>> 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;
```

on 17 Oct 2016
Edited by michio

### michio (view profile)

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```

```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

### Kojiro Saito (view profile)

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

### Abhinav Gaur (view profile)

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.