[FieldTrip] Error in ft_hastoolbox

Cristiano Micheli michelic72 at gmail.com
Wed May 25 15:23:35 CEST 2016

Dear Conrado,
I encountered this error before and it is due to a changed arguments set in
the exist function for one of the latest MatLab versions (I think starting
from 2014a if I remember well).
Which version  of MatLab are you running?

try to apply this change:
if exist(varname) -> if exist(varname,'var')

That should do it
I hope this helped!


On Wed, May 25, 2016 at 2:28 PM, Conrado Bosman <conrado.bosman at gmail.com>

> Dear fieldtrippers,
> I’m trying to read the header of a Neuralynx dataset, using the last
> FieldTrip version available at Github, running on a Linux machine. I
> encounter the following error (see below).
> Originally, I thought that the problem could be related to a FieldTrip
> dependency on a .mex file, that should be downloaded from the Neuralynx
> website (‘Neuralynx file reader and writer for Matlab on Linux and Mac OS
> X’), so I downloaded, compiled and placed the toolbox on a recognizable
> MATLAB path.
> Then, when I run ft_hastoolbox, I noticed that the value of the variable
> dependency is “3”, which is the expected outcome from the MATLAB function
> “exist" (which is used in the helper function has_mex from ft_hastoolbox
> (l539)), when you have a recognizable mex file. However, the value 3
> provides you the cryptic error message in “is_present” at line 576
> Do you have any clue if I’m doing something wrong?
> Thanks in advance!
> Conrado
> K>> Error using ft_hastoolbox>is_present (line 576)
> this should not happen
> Error in ft_hastoolbox (line 378)
> status = is_present(dependency);
> Error in read_neuralynx_ncs (line 57)
>   isMexv3 = ft_hastoolbox('neuralynx_v3', 2); % let's leave warnings for
> debug
> Error in read_neuralynx_ds (line 84)
>         orig(i) = read_neuralynx_ncs(fname{i}, 0, 0);
> Error in ft_read_header (line 1576)
>     hdr = read_neuralynx_ds(filename);
>  of a Neuralynx
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