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Derivative of $γ^r$ with respect to the dimensionless pressure $π$

Values for calculation

$ n $
$ I $
$ \{π\in\mathbb{R}\mid π>0\} $
This set includes all real numbers that are greater than zero. Therefore, it contains only positive numbers. Zero and negative numbers are not included in this set.
$ π $
$ \{τ\in\mathbb{R}\mid τ>0\} $
This set includes all real numbers that are greater than zero. Therefore, it contains only positive numbers. Zero and negative numbers are not included in this set.
$ τ $
$ J $
$ \text{Region} $

Calculation

Derivative of $ γ^r $ with respect to the dimensionless pressure $ π $

$\text{if }\ \text{Region}= 2$
$\text{if }\ \text{Region}= 2$
Equations in LaTeX code
\text{if }\ \text{Region}= 2
$$γ^r_π=\sum_{i=1}^{43}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot\left(τ-0.5\right)^{J[i]}}$$
$γ^r_π=\sum_{i=1}^{43}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot\left(τ-0.5\right)^{J[i]}}$
Equations in LaTeX code
γ^r_π=\sum_{i=1}^{43}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot\left(τ-0.5\right)^{J[i]}}
$\text{else if }\ \text{Region}= 5$
$\text{else if }\ \text{Region}= 5$
Equations in LaTeX code
\text{else if }\ \text{Region}= 5
$$γ^r_π=\sum_{i=1}^{6}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot τ^{J[i]}}$$
$γ^r_π=\sum_{i=1}^{6}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot τ^{J[i]}}$
Equations in LaTeX code
γ^r_π=\sum_{i=1}^{6}{n[i]\cdot I[i]\cdot π^{I[i]-1}\cdot τ^{J[i]}}
$\text{else}$
$\text{else}$
Equations in LaTeX code
\text{else}
$$γ^r_π=0$$
$γ^r_π=0$
Equations in LaTeX code
γ^r_π=0
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