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  MKL variable declaration mkl95_precision

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• marcioy May 12, 2011 8:01 PM PDT    use mkl95_precision, only: wp => dp Hi everyone, I am migrating from IMSL to MKL. I am trying to implement matrix-matrix and matrix-vector calculations using the BLAS. I have a doubt about what the following statements mean: (...) use mkl95_precision, only: wp => dp implicit none real(wp):: alpha, beta;  !just an example of variables; (...) It seems that alpha and beta are double precision variables. There is any difference between the above statement and the following declaration? Which one should I use? (...)          double precision alpha, beta; (...) Thank you in advance Marcio Yamamoto Chao Y (Intel) May 13, 2011 12:05 AM PDT Rate   #1 use mkl95_precision, only: wp => dp Hi Marcio, You are right. They are double precision. Both of those two be compiled. If you write alpha, beta as: real(wp):: alpha, beta; It make it some easier to change to single precision code, and only need to change: wp => DP to wp = SP Thanks, Chao marcioy May 13, 2011 12:26 AM PDT Rate   #2 Reply To #1 use mkl95_precision, only: wp => dp Thank you, Chao! The guys in Intel work up to midnight??!! You guys are my heroes! ;) I was wondering if the statement  "real(wp):: alpha, beta;" creates any special data structures/object which was necessary for the MKL/BLAS calculation. But it is not the case, right? Both statements generate exactly the same data structure: double precision array? You should get some sleep, Chao. Thank you again. Marcio

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