MATLAB: Error Message ” grpstats requires Statistics and Machine Learning Toolbox”

error messageMATLAB

I have just installed MATLAB but i keep getting an error message when running in-bult functions in Statistics and Machine learning tool box. The error message is " grpstats requires Statistics and Machine Learning toolbox." Matlab was able to find the function when i run "edit or which" but couldn't run it.

What could be wrong?

Best Answer

The ver command will tell you the toolboxes you have installed, but they are not necessarily licensed. Try going to the license center and see which ones you have there.

Related Solutions

MATLAB: Help using grpstat() function

I understand that you are facing issues while trying to use the function "grpstats". The syntax for using the "grpstats" function is:

statarray = grpstats(tbl,groupvar,whichstats)

This syntax finds summary statistics specified in "whichstats" based on grouping variable "groupvar" for the data specified in "tbl". Thus, to find the mean, maximum and minimum MPG for cars manufactured in each year in the "carbig" dataset you have to use the following commands:

%%Statistics
meanMPG = grpstats(MPG,Model_Year,'mean');
maxMPG = grpstats(MPG,Model_Year,'max');
minMPG = grpstats(MPG,Model_Year,'min');

One way to visualize the MPG statistics by year is to use "errorbar". This function has the following syntax:

errorbar(X,Y,E)

Thus, for the dataset mentioned in this question, "Y" is the mean MPG which is plotted with respect to "X" or the Model_Year. The advantage of using this function is that the error "E" can be replaced with the standard deviation which is then plotted as an error bar. here is some code to do the same:

%%Code to visualize MPG statistics over time
stdMPG = grpstats(MPG,Model_Year,'std');   % Find standard deviation
errorbar(unique(Model_Year),meanMPG,stdMPG);
xlabel('Model year');
ylabel('MPG');
title('MPG over Time');

MATLAB: Grpstats for several variables

Have a look at the list of statistics that are accepted as character vectors. Note that 'median' is not one of the options.

https://www.mathworks.com/help/stats/grpstats.html#bthgdq6-whichstats

Instead, you'll need to use a function handle to list 'median' as a stat.

stat1 = grpstats(ds, {'Sodyum', 'AST'} , {'mean', @median});

That fixes any syntax issues. If problesm persist, please describe the problem in detail and share the result of the following line (assuming ds is a table which appears to be the case).

head(ds) % if ds is a table

Best Answer

Related Solutions

MATLAB: Help using grpstat() function

MATLAB: Grpstats for several variables

Related Question