MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Telling Mathematica that a symbol is going to be a List?


I want to define a function containing parameters that are going to be 
elements in a list, e.g. something like

  m := { { d[[1]], 0, 0}, {0, d[[2]], 0}, {0, 0, d[[3]]}

but not define the list of values of  d  until later (and not put the 
parameters in as explicit arguments of  m  just to keep the appearance 
less cluttered and typing easier).

If I then give an input line

    m /. {d -> {d1, d2, d3} } // MatrixForm

I get "Part::partd" errors -- but the matrix then displays correctly.

I can of course just Off[] the errors -- but is there a better way.


  • Prev by Date: Expanding a Square Root
  • Next by Date: Re: Font rendering in Mathematica 5.0 on Mac OS X
  • Previous by thread: Re: Expanding a Square Root
  • Next by thread: Re: Telling Mathematica that a symbol is going to be a List?