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Groups > comp.soft-sys.math.mathematica > #2472

Re: Ignore missing data

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On May 18, 4:15 am, dim <dimemp...@gmail.com> wrote:
> Hello everybody!
>
> I would like to know how to ignore missing data
> and to be more specific I'll give an example.
>
> his = {1,2,3,4,5,6,7,,9};
> simcs1 = RandomReal[10, 9];
> simcs2 = RandomReal[10, 9];
>
> simcsi = a1*simcs1 + a2*simcs2;
> (his - simcsi)^2;
> er = Plus @@ %
> Minimize[{er, 0 <= a1 <= 1 && 0 <= a2 <= 1  && a1 + a2 == 1}, {a1, a2}]
>
> It doesn't work, since the 8th value of "his" is missing.
> Do you know how i could make Mathematica ignore also the
> corresponding values of simcs1 and simcs2? Namely, in my
> example how to ignore the 8th value of simcs1 and simcs2.
>
> Please note that i don't want to delete the missing data,
> neither to make them equal to 0.
>
> Thank you in advance!

Change the definition of 'er' to  %.Boole[NumericQ /@ his]

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Ignore missing data dim <dimemples@gmail.com> - 2011-05-18 11:15 +0000
  Re: Ignore missing data Ray Koopman <koopman@sfu.ca> - 2011-05-19 11:41 +0000
  Re: Ignore missing data Peter Pein <petsie@dordos.net> - 2011-05-19 11:41 +0000

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