Error message with ttest function & others statistics tests

Hello,

I enter this simple code (example given by matlab documentation) :

>> load examgrades;

>> x = grades(:,1);

>> y = grades(:,2);

>> h = vartest2(x,y,'Tail','right')

But I have this error message :

Unable to resolve the name statslib.internal.parseArgs.

Error in internal.stats.parseArgs (line 42)

[varargout{1:nargout}] = statslib.internal.parseArgs(pnames,dflts,varargin{:});

Error in ttest (line 104)

internal.stats.parseArgs(okargs,defaults,varargin{:});

It's ok when I write just : h = vartest2(x,y)

I'can't add name-value pair arguments.

I don't understant this error message. have already used this function with my free trial license and I never had a problem before.

Thanks for your solution !

Answer 1

[Deepak Gupta]

Hello SK,

I just tried your code and didn't face any problems.

load examgrades;
x = grades(:,1);
y = grades(:,2);
h = vartest2(x,y,'Tail','right')

I am using R2019b, can you tell me which version do you have?

You can also try to run this from matlab root directory. To go to root, run cd(matlabroot)

Thanks,

Deepak

[SK]

Thanks for your answer. I use R2020a (the last version)

I have already used this function with my free trial license and I never had a problem before. I buy my licence yesterday ;-(

[SK]

It's the student licence (suite licence)

[Deepak Gupta]

Are you running this code line by line in command prompt? I think that could be the problem.

Can you try to run this using a script file? Or use live script as given in the example itself. It should run fine

[SK]

Yes I have already tried line by line and with a script.

I test an another script and I had the same problem (linear fit):

Unable to resolve the name statslib.internal.parseArgs.

Error in internal.stats.parseArgs (line 42)

[varargout{1:nargout}] = statslib.internal.parseArgs(pnames,dflts,varargin{:});

Error in LinearModel.fit (line 937)

internal.stats.parseArgs(paramNames, paramDflts, otherArgs{:});

Error in fitlm (line 121)

model = LinearModel.fit(X,varargin{:});

Error in reglin (line 21)

mdl=fitlm(x,y);

I don't understand !!!! Should I reinstall matlab ?