visual3d:documentation:pipeline:metric_commands:metric_cross_product
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| visual3d:documentation:pipeline:metric_commands:metric_cross_product [2025/10/02 18:58] – [Examples] wikisysop | visual3d:documentation:pipeline:metric_commands:metric_cross_product [2025/10/03 17:35] (current) – [Example: Computing Step Length from Stride Vectors Using Dot Product] wikisysop | ||
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| The results are concatenated to an existing signal. | The results are concatenated to an existing signal. | ||
| - | ====Examples==== | + | ====Example: Computing Step Length from Stride Vectors Using Dot Product==== |
| + | In this example the **Metric Cross Product** command is used along with **Metric Vector Between Events** and **Automatic Gait Events** to find the width of each step in a gait trial. | ||
| - | ===Simple example: Stride Vectors=== | + | First all files are selected as active and key gait events are defined for each trial: |
| - | Here we use the **Metric Cross Product** command to compute step width from previously calculated stride vectors found using **Metric Vector Between Events**. | + | |
| - | The command | + | < |
| + | Select_Active_File | ||
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| + | Automatic_Gait_Events | ||
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| + | Next **Metric Vector Between Events** | ||
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| + | Metric_Vector_Between_Events | ||
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| + | Now that the vectors for the feet have been defined, **Metric Cross Product** can be used to compute the dot product of those vectors and determine the step width for each stride: | ||
| < | < | ||
| + | ! Calculate LeftStepWidth by taking cross product of LeftStep vector and StrideVectors_MEAN | ||
| + | ! Generate Mean and STD DEV | ||
| + | Metric_Cross_Product | ||
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| + | ! Calculate RightStepWidth by taking cross product of RightStep vector and StrideVectors_MEAN | ||
| + | ! Generate Mean and STD DEV | ||
| Metric_Cross_Product | Metric_Cross_Product | ||
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| </ | </ | ||
| - | In the case that you already know or have calculated step length | + | The **METRIC: |
| - | ===Complex example=== | + | |
| - | + | ||
| - | For a more in depth example | + | |
| + | {{: | ||
| + | A more complete example including dot products is available [[visual3d: | ||
visual3d/documentation/pipeline/metric_commands/metric_cross_product.1759431529.txt.gz · Last modified: 2025/10/02 18:58 by wikisysop