[FieldTrip] Error in ft_hastoolbox

[Conrado Bosman]

Hey Cristiano,
Thanks for the advice!
The problem that I’m seeing is that exist should evaluate whether the mex file exits or not. In that sense, in the actual version, the developers are using exist(varname,’file’) which I think it is correct
The problem is that the output is neither a string, cell or logical values. It gives you a double valued 3 which is exactly what you expect if you are evaluating a mex file which is present in the matlab path. But in is_present, number 3 is not considered as a reasonable output and that’s why is given you this weird “this should not be happen” message. Maybe I will write Robert directly, it seems to me that this is a bug of the code

best
Conrado
> On 25 May 2016, at 15:23, Cristiano Micheli <michelic72 at gmail.com> wrote:
> 
> 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!
> 
> 
> Cris
> 
> On Wed, May 25, 2016 at 2:28 PM, Conrado Bosman <conrado.bosman at gmail.com <mailto:conrado.bosman at gmail.com>> wrote:
> 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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