Assistance with simple error

Hi,

I am copying the code below from this page, but it says error

"Undefined function 'a' for input arguments of type 'char'."

Could anybody tell me what is wrong?

Thanks

http://www.mathworks.co.uk/help/symbolic/mupad_ref/plot-qqplot.html

a := [6, 9, 17,  0, 13, 9, 9, 12, 12, 12]:
b := [7, 8, 20,  2, 11, 8, 9, 12, 13, 15, 2, 14]:
q := plot::QQplot(a, b):
plot(q)

Answer 1

[Walter Roberson]

Provided you have the symbolic toolkit, at the MATLAB command line use

a = [6, 9, 17,  0, 13, 9, 9, 12, 12, 12];
b = [7, 8, 20,  2, 11, 8, 9, 12, 13, 15, 2, 14];
feval(symengine, 'plot::QQplot', a, b);

Answer 2

[Muruganandham Subramanian]

Check this:

 I don't have r2012b version

      a = [6, 9, 17,  0, 13, 9, 9, 12, 12, 12];
      b = [7, 8, 20,  2, 11, 8, 9, 12, 13, 15, 2, 14];
      plot::QQplot([a, b]);

[John]

Thanks,

On the :: it is giving the Error: Unexpected MATLAB operator.

Any suggestions?

Answer 3

[Wayne King]

Are you trying to enter this directly at the MATLAB command prompt?

You have to first enter

 >>mupad

Then copy and paste the code in the MuPAD notebook and hit enter

[John]

Thanks!

[John]

Could you tell me the correct syntax for the command line?

It doesn't seem to like the ::

a = [6, 9, 17,  0, 13, 9, 9, 12, 12, 12];
      b = [7, 8, 20,  2, 11, 8, 9, 12, 13, 15, 2, 14];
      plot::QQplot([a, b]);

Answer 4

[Wayne King]

Do you have the Statistics Toolbox? If so you don't need to use MuPAD

    a = [6, 9, 17,  0, 13, 9, 9, 12, 12, 12];
    b = [7, 8, 20,  2, 11, 8, 9, 12, 13, 15, 2, 14];
    qqplot(a,b)

[John]

Thanks, I thought the qqplot at this link was for continuous variables

http://www.mathworks.co.uk/help/stats/qqplot.html

And the qqplot at this link was for discrete variables (that is what the documentation says).

http://www.mathworks.co.uk/help/symbolic/mupad_ref/plot-qqplot.html

They do not produce the same plots?

I need to use the discrete option.

Thank you

Answer 5

[Sean de Wolski]

And in MuPAD, all you have to do is paste what you have above into a code line.