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  • $\begingroup$ Whould you share with us what f is? $\endgroup$ Commented Sep 21, 2018 at 13:06
  • $\begingroup$ f is a function but in this code it is just a variable. I thought of computing this matrix first and then define what f is, because every single computation of f takes about 0.02 seconds. $\endgroup$ Commented Sep 21, 2018 at 13:30
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    $\begingroup$ It is absolutely contraproductive to use symbolic code here. For example, the SparseArray cannot store the values in a packed array, if the values are not machine numbers. In the end, the values must be calculated anyways. So, please give me a concrete example for f. $\endgroup$ Commented Sep 21, 2018 at 13:33
  • $\begingroup$ Let it be for example f[{a_, b_, c_, d_, i_, j_}] := a + b + c + d + i + j; then?. $\endgroup$ Commented Sep 21, 2018 at 13:42