[R] Correlation matrix removing insignificant R values

[mgranlie]

Hello.

I have a large dataset with sales pr month for 56 products with 10 months
and i have tried to see how the sales are correlated using 
cor()

This has given me a 56X56 matrix with the R value for each product pair.
Most of these correlations are insignificant, and i want only to retain the
instances were the R value is significant (for 10 observations it should be
above 0.64)

Can someone help with this?

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