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Derivative of $φ$ with respect to the dimensionless density $δ$

Values for calculation

$n$
$δ$
$I$
$τ$
$J$
$\text{Region}$

Calculation

Derivative of $ φ $ with respect to the dimensionless density $ δ $

$\text{if }\ \text{Region}= 3$
$$φ_δ=\left(n\right)[1]\cdot δ^{-1}+\sum_{i=2}^{40}{n[i]\cdot I[i]\cdot δ^{I[i]-1}\cdot τ^{J[i]}}$$
$\text{else}$
$$φ_δ=0$$