How to define some orders in ARIMA

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Fred
Fred 2013-8-22
I want to define an ARIMA(1,0,8) but I only want the model to find the optimal values for first and last MA orders in a way that for MA component orders from 2 to 7 are zero.How should I change the following function?
model = arima(p,0,q);

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Shashank Prasanna
Shashank Prasanna 2013-8-22
This should do the trick:
arima('ARLags',1,'MALags',[1 8])
ans =
ARIMA(1,0,8) Model:
--------------------
Distribution: Name = 'Gaussian'
P: 1
D: 0
Q: 8
Constant: NaN
AR: {NaN} at Lags [1]
SAR: {}
MA: {NaN NaN} at Lags [1 8] <--------
SMA: {}
Variance: NaN
http://www.mathworks.com/help/econ/arimaclass.html

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