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Assistance with simple error

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John
John 2012-12-10
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)

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采纳的回答

Walter Roberson
Walter Roberson 2012-12-10
编辑：Walter Roberson 2012-12-10
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);

更多回答（4 个）

Muruganandham Subramanian
编辑：Muruganandham Subramanian 2012-12-10
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]);
  1 个评论
John
John 2012-12-10
Thanks,
On the :: it is giving the Error: Unexpected MATLAB operator.
Any suggestions?

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Wayne King
Wayne King 2012-12-10
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
  2 个评论
John
John 2012-12-10
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]);

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Wayne King
Wayne King 2012-12-10
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)
  1 个评论
John
John 2012-12-10
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

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Sean de Wolski
Sean de Wolski 2012-12-10
And in MuPAD, all you have to do is paste what you have above into a code line.

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