[R] Error: (subscript) logical subscript too long

[René Holst]

As part of a larger program I have a rather long and involved sub-procedure which fails to work, It manipulates some large matrices, stored to the disc. The procedure halts with the message:

Error: (subscript) logical subscript too long

Can anyone give advice about what may cause this error and how it can be remedied - I feel confident that it is not a syntactically or logical error.

Thanks,

René