max function is missing in the @logical file on 'matlab' toolbox

Hello all,

I am facing a strange problem and I have not seen any possible solution for it on the web except a very loose and general solution which is re-installing a toolbox.

I am using the built-in max function in my code and matlab returns an error saying: Undefined function 'max' for input arguments of type 'struct'.

As you expected, I have surfed the web and applied EVERY possible and proposed solution but unfortunately nothing worked. I checked everything guys.

So, I typed: which max and it returns this:

built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@logical\max) % logical method

and I tracked this path and surprisingly I did not find the @logical file in this path!!

as a possible solution: I uninstalled and re-installed matlab again in a hope for the @logical file to be re-established but unfortunately the problem still persisting. I also updated the toolbox.

Note: My code was running WITH absolutely NO problem and it hasn't been modified at all. All files are in the directory and there is no path issues.

Summary of the problem:

1- @logical file is missing which belongs to 'matlab' toolbox (the toolbox name is matlab). 2- The toolbox of @logical is installed and its name is matlab. 3- My matlab version is R2013b.

Answer 1

[per isakson]

Firstly try

    which max -all

which shows that there are max for many types of data, but not for struct.

Secondly, what do you expect that max(a_struct) should return?

"Note: My code was running WITH absolutely NO problem [...]" &nbsp Are you really sure that there isn't something else that causes the problem?

Could it be that some function, which used to return e.g a double array, now returns a struct?

[Tony]

Hello Per,

which -all max

returns this:

 built-in (C:\ProgramFiles\MATLAB\R2013b\toolbox\matlab\datafun\@logical\max) %logical method

 built-in(C:\ProgramFiles\MATLAB\R2013b\toolbox\matlab\datafun\@char\max)     %char method

 built-in(C:\ProgramFiles\MATLAB\R2013b\toolbox\matlab\datafun\@double\max)   % double method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@uint8\max)    % uint8 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@uint16\max)   % uint16 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@uint32\max)   % uint32 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@uint64\max)   % uint64 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@int8\max)     % int8 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@int16\max)    % int16 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@int32\max)    % int32 method

 built-in (C:\Program Files\MATLAB\R2013b\toolbox\matlab\datafun\@int64\max)    % int64 method

 built-in(C:\ProgramFiles\MATLAB\R2013b\toolbox\matlab\datafun\@single\max)   % single method

 C:\ProgramFiles\MATLAB\R2013b\toolbox\matlab\datatypes\@categorical\max.m     % categorical method

 C:\ProgramFiles\MATLAB\R2013b\toolbox\distcomp\parallel\@codistributed\max.m  % codistributed method

 C:\ProgramFiles\MATLAB\R2013b\toolbox\distcomp\gpu\@gpuArray\max.m            % gpuArray method

 C:\ProgramFiles\MATLAB\R2013b\toolbox\finance\ftseries\@fints\max.m           % fints method
 C:\ProgramFiles\MATLAB\R2013b\toolbox\mbc\mbcmodels\@localpspline\max.m       % localpspline method

 C:\ProgramFiles\MATLAB\R2013b\toolbox\mbc\mbcmodels\@localpoly\max.m          % localpoly method

 C:\ProgramFiles\MATLAB\R2013b\toolbox\matlab\timeseries\@timeseries\max.m     % timeseries method

I have a very complicated code and when I run it I get this exact error:

 ??? Undefined function or method 'max' for input arguments of type 'struct'.

 Error in ==> Ban_atm at 67
if max(wav_index)>length(cells.wavnum) | min(wav_index)<1

and it was running perfectly and smoothly.

BTW, according to my experience on seeking out solutions for this bug:

 Undefined function or method 'max' for input arguments of type 'struct'.

it does not imply or indicate one solution! Though I tried every proposed solution for this error, yet non is working.

The:

 wav_index

is a struct and I want to perform the operation mentioned above which is the max of that

 wav_index

Thank you. Your guide over this error is much appreciated.

[per isakson]

I bet wav_index wasn't a struct when your code run in the previous release. With Matlab you cannot be sure.

wav_index, isn't that a strange name for a struct. "Index" indicates a vector of whole numbers.

How is wav_index assigned its value?