Innovate Motorsports LogWorks 3 - Manual (Page 122)

LogWorks3_Manual_1.01.doc - 122 -
10.8 Chart Calculator
The chart calculator usage is exactly the same as for the Math Trace Calculator. With the
following differences:
•
Channel names CANNOT be used as variables
•
Sub-chart names can be used as variables.
•
The special math functions slope and area cannot be used.
•
The MC special function stands here for “Make Chart”.
The additional variables for the MC function, like unit and limits, are ignored. MC creates
a new user chart.
• The ‘t’ variable for time is not available
• Standard sub-charts can be modified
Because sub-chart names can be used as variables, the same restrictions as for general variable
names applies here too. See section 5.3, Restrictions on variable names for details.
10.8.1 Pre-assigned names for the standard sub-charts:
chart_avrg
The “average value” sub-chart.
chart_num The “number of datapoints” sub-chart
chart_stddev The “standard deviation” sub-chart
chart_min
The “minimum value” sub-chart
chart_max The “maximum value” sub-chart
chart_X The horizontal value (column header) of the bin used
chart_Y The vertical value (row header) of the bin used
10.8.2 Using the Chart Calculator
Here are a few examples on how to use the chart calculator:
Example 1: Filtering the chart so that only values with more than 50 data points are used:
chart_num = (chart_num > 50) * chart_num
In this case, the number of data points is reset to 0 (empty) if it has less than 51 data points in it.
The term (chart_num > 50) evaluates to 1 if the number of data points in the bin is more than 50,
otherwise to 0. So, chart_num stays either the same (chart_num * 1 = chart_num) or becomes 0
(chart_num * 0 = 0).