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[Lapack] DSYEVR error


I have installed CLAPACK and am trying to use the DSYEVR function to 
invert a simple 3x3 matrix as a test. However, at run-time I get the 
following error

** On entry to DSYEVR, parameter number 18 had an illegal value

Parameter 18, which refers to the LWORK variable, is set to an integer 
value of -1.

I have also tried with LWORK (and the dimension of WORK) set to large 
values such as 100, but get the same result.

Any help would be greatly appreciated


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