I have issue with mahal() function

When I use

   ds = mahal([X Y], [X Y]); 
   Undefined function 'mahal' for input arguments of type 'double'
   or
   ds = mahal(double([X Y]), double([X Y]));
   Undefined function 'mahal' for input arguments of type 'double'.

Can someone help me?

The X and Y are two list. X =

    0.2000
   -7.1100
   -3.2900
   -7.1100
   -3.2100
   -4.9200
   -0.9000
    5.6700
    4.6300
    5.3400
    3.9200
    4.8000
    2.8700
    5.7400
    4.3600
    4.0000
    3.4900
    4.1500
    2.0400
   -1.2200
    3.4800
    2.4500
   -1.2200
   -2.6100
    2.4200
   -6.0300
   -4.8400
   -2.3800
    0.2500
    3.2500
   -5.2800
   -4.2900
   -1.8200
    2.2800
    0.4800
   -0.7300
    2.1000
    1.1200
   -0.9500
   -2.4400
   -5.6700
   -4.9500
   -2.2400
   -4.2000
   -4.7700
    0.6800
    5.8500
    3.3300
    4.3800
    6.2100
    4.8400
    5.8100
    2.8400
    0.2100
    0.9400
    1.5200
    0.1400
    2.6800
    0.8200
   -1.2000
   -2.0400
   -1.3500
   -3.1400
   -3.1800
   -5.1700
   -5.3000
   -1.1400
   -4.7100

And Y =

-64.7900
-32.9500
-33.7900
-23.3200
-37.2300
-27.8100
-36.5100
-27.3200
-34.4400
-59.9400
-38.5600
-29.1900
-38.3100
-27.2900
-34.8900
-26.8600
-38.2200
-26.6400
-28.9300
-23.9900
-60.3400
-36.6800
-24.1000
-34.2300
-26.6600
-36.1900
-33.3900
-58.7000
-59.6300
-65.3800
-24.8500
-24.5600
-24.5200
-65.3800
-14.7800
-34.1500
-25.9200
-28.9100
-65.4300
-34.2700
-38.1000
-64.5800
-28.1900
-64.8000
-34.1900
-24.5800
-65.8900
-25.3400
-27.9100
-66.0900
-29.0500
-35.6600
-38.3700
-34.1800
-65.5500
-29.5100
-14.8700
-36.9100
-59.5400
-28.4500
-24.9500
-34.1700
-37.3600
-28.5200
-33.4300
-27.5500
-64.8200
-27.7100

[Xi Chen]

not working after I follow your instruction to reset everything. Undefined function 'mahal' for input arguments of type 'double'.

Answer 1

[Sebastian Castro]

The mahal function is in the Statistics and Machine Learning Toolbox (in older releases, just Statistics Toolbox).

Do you have this installed? You can check by typing "ver" at the Command Window and seeing if it appears.

- Sebastian

[Xi Chen]

Thanks Sebastian, I do:

MATLAB Version: 8.5.0.197613 (R2015a)
MATLAB License Number: •••••••
Operating System: Mac OS X  Version: 10.10.4 Build: 14E46 
Java Version: Java 1.7.0_60-b19 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
----------------------------------------------------------------------------------------------------
MATLAB                                                Version 8.5        (R2015a)
Simulink                                              Version 8.5        (R2015a)
Curve Fitting Toolbox                                 Version 3.5.1      (R2015a)
DSP System Toolbox                                    Version 9.0        (R2015a)
Database Toolbox                                      Version 5.2.1      (R2015a)
Econometrics Toolbox                                  Version 3.2        (R2015a)
Financial Toolbox                                     Version 5.5        (R2015a)
Global Optimization Toolbox                           Version 3.3.1      (R2015a)
Image Processing Toolbox                              Version 9.2        (R2015a)
MATLAB Compiler                                       Version 6.0        (R2015a)
MATLAB Compiler SDK                                   Version 6.0        (R2015a)
Mapping Toolbox                                       Version 4.1        (R2015a)
Neural Network Toolbox                                Version 8.3        (R2015a)
Optimization Toolbox                                  Version 7.2        (R2015a)
Parallel Computing Toolbox                            Version 6.6        (R2015a)
Partial Differential Equation Toolbox                 Version 2.0        (R2015a)
Signal Processing Toolbox                             Version 7.0        (R2015a)
Statistics and Machine Learning Toolbox               Version 10.0       (R2015a)
Symbolic Math Toolbox                                 Version 6.2        (R2015a)
Wavelet Toolbox                                       Version 4.14.1     (R2015a)

[Sebastian Castro]

Hmmm... I wonder why it can't find the function then. First, try typing the following command:

>> which -all mahal

... and seeing if anything comes up. If it doesn't, it may be likely that something went wrong with where MATLAB is looking for functions. You could try resetting the default MATLAB path and toolbox cache with these commands,

>> restoredefaultpath
>> rehash toolboxcache

Let's see if that works.

- Sebastian

[Xi Chen]

Not working, should I reinstall it?

>> which -all mahal /Applications/MATLAB_R2015a.app/toolbox/stats/stats/mahal.m % Has no license available /Applications/MATLAB_R2015a.app/toolbox/stats/stats/@gmdistribution/mahal.m % gmdistribution method, Has no license available >> restoredefaultpath >> rehash toolboxcache >> LACS( 'test_in.txt', 'test_out.txt' ) Undefined function 'mahal' for input arguments of type 'double'.

Error in ord>pf (line 114) ds = mahal([X Y], [X Y]);

Error in ord>findoffset (line 100) offset = pf(tmp(:, Nn+1), tmp(:, Nn+2), x, tmp(:, 1:2), out_name, ths(x-1));

Error in ord (line 49) offset = findoffset(tmp, x+1, out_name, pH);

Error in LACS (line 35) ca = ord(filename, 2, out_name);

Answer 2

[Sebastian Castro]

See how when you typed in that "which -all" command you got this:

>> which -all mahal 
/Applications/MATLAB_R2015a.app/toolbox/stats/stats/mahal.m % Has no license available
/Applications/MATLAB_R2015a.app/toolbox/stats/stats/@gmdistribution/mahal.m % gmdistribution method, Has no license available

I would contact your license administrator or call MathWorks customer support to figure this out. I know absolutely nothing about licensing, but it seems like something is either wrong or expired.

- Sebastian

[Walter Roberson]

Right, the software is installed but you have no current valid license for it. This includes the case where you are using a license server and it has run out of licenses for that toolbox, but you would normally have seen other relevant messages as well in the license server case.

Answer 3

[SHREEKANT DESHPANDE]

Hi, I am new with matlab, however reasonably understand background statistics.

I am trying to calculate mahal distance (D2 = MAHAL(Y,X))between two set of matrices (10,4) and (3, 4) however system out is NAN.

Ex:

X is

6.27123 0.0565732 -0.0205172

7.1023 0.00702738 0.0178935

6.53152 0.0418525 -0.0182539

7.42208 0.00261353 0.0146638

3.32587 0.0585499 0.008547

7.27152 -0.0279264 0.0625709

6.39666 0.0161053 0.0292219

-8.31145 0.442099 0.0748912

-5.63082 -0.0296625 -0.211935

-8.44003 0.446935 0.0856395

 and Y is

-9.89905 -0.0802276 -0.233074

-2.55819 -0.456706 -0.145712

-9.48164 -0.477232 0.336065

Please help me in calculating this distance. Thank you