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--- visual3d:documentation:pipeline:expressions:expression_numbers [2024/07/17 15:42] – removed sgranger
+++ visual3d:documentation:pipeline:expressions:expression_numbers [2025/06/20 19:07] (current) – Added headers and cleaned up <code> tags. wikisysop
@@ Line 1: / Line 1: @@
+====== Expression Numbers ======
+There is current a single "numbers"-related expression function.
+===== Random =====
+rand(lo_value,hi_value,signal) - random number in the range (lo_value,hi_value)
+==== Example: Generate a random number in the range 0 to 1 ====
+<code>
+Set_Pipeline_Parameter_From_Expression
+/PARAMETER_NAME=TEST1
+/EXPRESSION=RAND()
+/AS_INTEGER=FALSE
+;
+ TEST1 = 0.220525
+</code>
+The default range for the random number is from 0 to 1.
+==== Example: Generate a random number within a range ====
+<code>
+Set_Pipeline_Parameter_From_Expression
+/PARAMETER_NAME=TEST2
+/EXPRESSION=RAND(2,3)
+/AS_INTEGER=FALSE
+;
+ TEST2 = 2.232995
+</code>
+The output value occurs in the range from lo_value to hi_value.
+==== Example: Generate a random number in a range to match a signal ====
+<code>
+Set_Pipeline_Parameter_From_Expression
+/PARAMETER_NAME=TEST3
+/EXPRESSION=RAND(2,3,FRAME_NUMBERS::ORIGINAL::FRAMES)
+/AS_INTEGER=FALSE
+;
+::TEST3 = 2.808424+2.582592+2.346721+2.697052+2.662510+2.861250+2.843808+...(to number of frames)
+</code>
+Using all three arguments will produce a random number in the range from lo_value to hi_value with the same number of components and frames as the argument signal.
+==== Example: Generate a specific number of random values ====
+<code>
+Set_Pipeline_Parameter_From_Expression
+/PARAMETER_NAME=TEST4
+/EXPRESSION=RAND(2,3,3)
+/AS_INTEGER=FALSE
+;
+::TEST4 = 2.446495 + 2.718410 + 2.201863
+</code>
+If the signal argument is a number, then that number of random values from the range lo_value to hi_value are returned.
+==== Example: Create a TARGET with random values between 0 and 1 ====
+<code>
+Create_Target
+/SIGNAL_NAMES=TEST5
+! /SIGNAL_DESCRIPTION=
+/EXPRESSION=RAND(0,1,TARGET::ORIGINAL::LFT1)
+! /INCLUDE_CALFILE=FALSE
+;
+</code>
+View the resulting signal in the 3D viewer by turning on the target trail:
+{{:random_target.jpg}}
+==== Example: create a TARGET with random values between 0 and 1 ====
+<code>
+Create_Target
+/SIGNAL_NAMES=TEST6
+! /SIGNAL_DESCRIPTION=
+/EXPRESSION=VECTOR(RAND(0,1,FRAME_NUMBERS::ORIGINAL::FRAMES),RAND(0,1,FRAME_NUMBERS::ORIGINAL::FRAMES),RAND(0,1,FRAME_NUMBERS::ORIGINAL::FRAMES))
+! /INCLUDE_CALFILE=FALSE
+;
+</code>
+Note that all components contain different values
+{{:Random7.jpg}} {{:random7view.jpg}}
+==== Example: Create a TARGET where each frame is on a random location on the surface of a sphere of radius 1 ====
+<code>
+Evaluate_Expression
+/EXPRESSION=RAND(-PI(),PI(),FRAME_NUMBERS::ORIGINAL::FRAMES)
+/RESULT_TYPES=DERIVED
+/RESULT_FOLDERS=RADIUS
+/RESULT_NAME=VERTICAL
+! /APPLY_AS_SUFFIX_TO_SIGNAL_NAME=FALSE
+;
+Evaluate_Expression
+/EXPRESSION=RAND(0,2*PI(),FRAME_NUMBERS::ORIGINAL::FRAMES)
+/RESULT_TYPES=DERIVED
+/RESULT_FOLDERS=RADIUS
+/RESULT_NAME=HORIZONTAL
+! /APPLY_AS_SUFFIX_TO_SIGNAL_NAME=FALSE
+;
+Create_Target
+/SIGNAL_NAMES=SPHERE
+! /SIGNAL_DESCRIPTION=
+/EXPRESSION=VECTOR(
+COS(DERIVED::RADIUS::VERTICAL)*COS(DERIVED::RADIUS::HORIZONTAL),
+-COS(DERIVED::RADIUS::VERTICAL)*SIN(DERIVED::RADIUS::HORIZONTAL),
+SIN(DERIVED::RADIUS::VERTICAL))
+! /INCLUDE_CALFILE=FALSE
+;
+</code>
+{{:random8view.jpg}}