Differences

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--- visual3d:documentation:pipeline:expressions:brackets [2024/07/17 15:42] – removed sgranger
+++ visual3d:documentation:pipeline:expressions:brackets [2024/11/15 20:15] (current) – [Brackets] wikisysop
@@ Line 1: / Line 1: @@
+====== Brackets ======
+===== Parentheses =====
+Parentheses **(** and **)** are used to contain the parameters in a function
+For Example\\
+Vector(0,0,1)
+===== Square_Brackets =====
+Square Brackets **[** and **]** specify frame numbers and components
+Square Brackets **[** and **]** are used at the end of a function call or parenthesis ( ) to specify the frames numbers and components
+Example, add two signals and retrieve the component 1 from frame 5
+<code>
+Evaluate_Expression
+/Expression= (TARGET::ORIGINAL::RFT1 + TARGET::ORIGINAL::RFT2)[5,1]
+/Result_Name=RFT_ADD_X
+/Result_Type=DERIVED
+/Result_Folder=PROCESSED
+;
+</code>
+Example, add two signals and retrieve the component 1 for all frames
+<code>
+Evaluate_Expression
+/Expression= (TARGET::ORIGINAL::RFT1 + TARGET::ORIGINAL::RFT2)[-1,1]
+/Result_Name=RFT_ADD_X
+/Result_Type=DERIVED
+/Result_Folder=PROCESSED
+;
+</code>
+**NOTE** a frame of -1 means all frames\\
+Extracting one "component" of data from signal
+The following command will result in the DERIVED signal TEST containing the X component values of the TARGET RFT1.
+<code>
+Evaluate_Expression
+/EXPRESSION=TARGET::ORIGINAL::RFT1::X
+/RESULT_NAME=TEST
+/RESULT_TYPE=DERIVED
+! /RESULT_FOLDER=PROCESSED
+;
+</code>
+== Using Square Brackets and Boolean Operators ==
+In this example, project a collection of markers onto the floor
+whenever the z-component of a marker is less than a threshold (e.g. 0.08 in this example)
+otherwise set the resulting frame to NO_DATA
+<code>
+Evaluate_Expression
+/EXPRESSION=(((CURRENT_SIGNAL[-1,3])<0.08)/((CURRENT_SIGNAL[-1,3])<0.08))*VECTOR(1,1,0)*CURRENT_SIGNAL
+/SIGNAL_TYPES=TARGET
+/SIGNAL_FOLDER=ORIGINAL
+/SIGNAL_NAMES=LFT1+LFT2+LFT3+RFT1+RFT2+RFT3
+/RESULT_TYPES=TARGET
+/RESULT_FOLDERS=GROUND
+! /RESULT_NAME=
+/APPLY_AS_SUFFIX_TO_SIGNAL_NAME=TRUE
+;
+</code>