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Here you can see that, as well as interpolating within the calibration points you enter, the WTP3 will also
extrapolate outside them.
Advanced calibration example 3
It is also possible to multiply, subtract and divide in your corrections. For example, a table to alter boat speed
with respect to angle of heel might look like:
4 0 0 1 1
table 0 *
-40 0.95
-30 0.95
-25 0.975
-20 0.99
-15 1.0
15 1.0
20 0.99
25 0.975
30 0.95
40 0.95
This table is, therefore, taking the standard input from boat speed (which would be specied in the bg_vars.d
le) and applying a correction based on angle of heel (bg_vars identication number 0 after table). So far, this
is operating the same as the example above. Next, however, we have a multiplication sign (*), which indicates
that boat speed is to be multiplied by the values in the table. Then the table works as before for calibrating with
respect to another variable: the left column indicates the value at which the calibrations to be applied while the
right column is the multiplication factor.
The example above would act to reduce boat speed with increasing angle of heel.
Other identiers and operators
As well as the word table, it is also possible to use two other identiers:
Variable
The following number refers to the bg_vars number and a mathematical symbol indicates
what operation is to be performed.
Constant
To specify a constant value to use in the calculation; a mathematical symbol indicates
what operation is to be performed.
There are also a number of mathematical operators that you can use:
+ Add
- Subtract
* Multiply
/ Divide
= Assigns a value to the variable you are calibrating
Calibration example 4
The line
constant 3.3 *
would mean that we are multiplying by a constant value of 3.3.
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