Re: [Maxima-discuss] How to use col(M,i)

[Gunter K. <gu...@pe...>]

My guess (it's only a guess: I don't have your build_info() and am on my phone) is that you get a 1-column-wide matrix that is printed as a list of lists. You can transpose your matrix before printing it and only print x[1] which would be the first row of this 1-row matrix.

Kind regards,

  Gunter.

Am 5. März 2019 16:50:15 MEZ schrieb Ronald Modesitt <ron...@gm...>:
>I write a line of code such as
>     m1: col(M,1),
>where M is a matrix of integer values (951 x 6) and '1' is the column
>of M
>that I wish to extract. I am expecting that m1 will be a column matrix.
>However it appears to me that what is returned is a column matrix of
>matrices.
>
>      m1 = [
>                 []
>                 []
>                  .
>                  .
>                  .
>                  []
>                  []
>                  []
>                     ]
>
>my actual code is:
>c1: zeromatrix(75,1)$
>m1:col(M,1)$
>lm: length(M)$
>for i: 1 step 1 thru lm do
>    (x: m1[i],
>    print("x= ",x),
>    c1[x]: c1[x]+1)$
>
>the resulting error message is:
>
>x= [65]
>apply: subscript must be an integer; found: [65]
> -- an error. To debug this try: debugmode(true);
>
>Am I misinterpreting the syntax of col(M,i) or misusing it altogether?
>
>Thanks
>
>Ron

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