Groups > comp.soft-sys.math.mathematica > #2446

Ignore missing data

From	dim <dimemples@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Ignore missing data
Date	2011-05-18 11:15 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<ir09oe$205$1@smc.vnet.net> (permalink)

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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!

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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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