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Merge pull request #209 from PhasicFlow/postProcessing 

corrections for readme.md file postprocessing
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@ -102,8 +102,25 @@ Within each processing region of type `bulk`, you can define multiple operations
| Function | Property type | Description | Formula | Required Parameters | | Function | Property type | Description | Formula | Required Parameters |
|----------|---------------|-------------|---------|---------------------| |----------|---------------|-------------|---------|---------------------|
| `average` | bulk | Weighted average of particle field values | $\frac{\sum_{i \in \text{region}} w_i \cdot \phi_i \cdot \text{field}_i}{\sum_{i \in \text{region}} w_i \cdot \phi_i}$ | `field`, `phi` (optional), `threshold` (optional), `includeMask` (optional), `divideByVolume` (optional) | | `average` | bulk | Weighted average of particle field values | see Equation 1 | `field`, `phi` (optional), `threshold` (optional), `includeMask` (optional), `divideByVolume` (optional) |
| `sum` | bulk | Weighted sum of particle field values | $\sum_{i \in \text{region}} w_i \cdot \phi_i \cdot \text{field}_i$ | `field`, `phi` (optional),`threshold` (optional), `includeMask` (optional), `divideByVolume` (optional) | | `sum` | bulk | Weighted sum of particle field values | see Equation 2 | `field`, `phi` (optional),`threshold` (optional), `includeMask` (optional), `divideByVolume` (optional) |
Equation 1:
$\text{result}=\qquad \frac{\sum_{j} w_j \cdot \phi_j \cdot \text{field}_j}{\sum_{j} w_i \cdot \phi_i}$
Equation 2:
$\text{result} = \sum_{j} w_j \cdot \phi_j \cdot \text{field}_j$
where:
- $j$ is the index of the particle in the region that also satisfies the `includeMask`
- $i$ is the index of the particle in the region
- $w_j$ is the weight of particle $j$ based on the selected processing method
- $\phi_j$ is the value of the `phi` field for particle $j$ (default is 1)
- $field_j$ is the value of the specified field for particle $j$
### Derived Functions ### Derived Functions
@ -334,11 +351,11 @@ Supported masks:
For weighted `bulk` properties calculation: For weighted `bulk` properties calculation:
$$ \text{average} = \frac{\sum_{i \in \text{region \& includeMask}} w_i \cdot \phi_i \cdot \text{field}_i}{\sum_{i \in \text{region}} w_i \cdot \phi_i} $$ $$ \text{average} = \frac{\sum_{i \in \text{region and includeMask}} w_i \cdot \phi_i \cdot \text{field}_i}{\sum_{i \in \text{region}} w_i \cdot \phi_i} $$
For weighted summing: For weighted summing:
$$ \text{sum} = \sum_{i \in \text{region \& includeMask}} w_i \cdot \phi_i \cdot \text{field}_i $$ $$ \text{sum} = \sum_{i \in \text{region and includeMask}} w_i \cdot \phi_i \cdot \text{field}_i $$
If `divideByVolume` is set to `yes`, the result is divided by the volume of the region: If `divideByVolume` is set to `yes`, the result is divided by the volume of the region: