How do omit values in Matlab when taking R values?

2011 12 2
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I have a matrix of El Nino Data with Precipitation Data. I have to find the correlation coefficient between El Nino and Precpitation. Some of the precipitation data that came is displayed as -9999 for not recorded.
When writing corrcoef(), how do I do it to where it will omit those elements that have the -9999's in it?

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Sean de Wolski
Sean de Wolski 2011-12-2

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So something like:
x = 1:10;
y = 3*(x)+7+rand(1,10)*2; %y = linear function of x plus noise
x([3 7]) = -9999;
corrcoef(x(x~=-9999),y(x~=-9999))

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Secret
Secret
2011-12-2

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